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Tribological properties and characterization of borided Co–Mg alloys

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Published/Copyright: March 24, 2022
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Open Chemistry
From the journal Open Chemistry Volume 20 Issue 1

Abstract

In this study, tribological properties and characterization of borided Co–Mg alloys were investigated. Cobalt–magnesium (CM) alloys with 97% Co–3% Mg composition were borided at temperatures of 850–900°C and for 1.5–4.5 h with solid boriding. The properties of the resulting boride layers were measured and determined by microhardness, scanning electron microscopy (SEM), X-ray diffraction (XRD), density, and surface roughness testers. XRD analysis results after boriding found CoB, Co2B, and Co phases. Depending on the boriding time and temperature, the thickness of the boride layer for the CM alloy varied from 51 to 138 µm. The boride layer had a hardness varying between 1,674 and 1,956 HV0.05 for the CM alloy, while the Vickers hardness value of untreated Cobalt was 52 HV0.05. The wear tests were carried out in a ball-disc arrangement under a dry friction condition at room temperature with an applied load of 10 N and with a sliding speed of 0.3 m/s at a sliding distance of 250 m. It was observed that the wear rate of borided and unborided CM alloy ranged from 25.89 × 10−5 to 94.95 × 10−5 mm3/N m. As a consequence of the findings, the author reported that boriding CM alloys in the given conditions can make a difference for different application areas.

Keywords: Co–Mg alloys; surface roughness; borided; wear

1 Introduction

Magnesium and its alloys are evaluated in the aviation, transportation, electronics, biomedical, and energy sectors owing to their excellent physical and chemical properties such as low density, good damping performance, biocompatibility, and recyclability [1,2,3,4]. Despite their prevalence, there are many challenges that must be overcome before these advantages of magnesium and its alloys play an important role in large-scale industrial applications [5,6,7,8]. The low tensile strength, poor plasticity, and corrosion resistance of magnesium alloys hinder large-scale applications of magnesium and cobalt (CM) alloys as structural materials [9,10,11].

Boriding is a thermochemical treatment that consists of Ni, Co, Ti, and Mg alloys, and steels with a rich-boron material (solid, liquid, or gas phases) [12,13,14]. This method, which is exposed to temperatures of around 800–1,000˚C to cause dissociation and diffusion of the boron atoms, improves the hardness and tribological properties of the surface of these alloys and steels [15,16,17]. Boriding is highly suitable for cobalt-based alloys where boride layers consisting of two phases (CoB and Co2B) with high hardness are the typical outcomes obtained. Additionally, boronizing enhances the mechanical properties of steels by forming boron layers such as Fe2B, FeB, Ni3B, Ni2B, and NiB on the surface [18,19,20,21,22,23].

Cobalt-based alloys have an excellent combination of mechanical strength and corrosion resistance that is well suited for a wide variety of aerospace, milling, and biomedical applications [24,25]. Nonetheless, some of its applications are limited due to its low hardness and wear resistance. Therefore, the boriding process is an effective method to improve the mechanical surface properties of CM alloys by diffusing boron atoms to the material surface [26,27].

The effects of the boriding method on different alloying elements have widely been studied in the literature. These elements include materials such as Al, Ni, Mo, Co, Fe, W, and WC [28,29,30,31,32,33,34,35]. Since Mg is a very specific element, it is rarely used in boriding methods. The main objective of this study is aimed at investigating the friction and wear behaviors of borided CM alloys. Structural and tribological properties were thoroughly investigated using a non-contact optical profilometer, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), microhardness tests, and a ball-on-disc tribo-tester. The findings were clearly given and discussed with the use of appropriate figures and tables as below.

2 Materials and methods

2.1 Boriding and characterization

Within the context of the present work, metal powders were used in 97% Co–3% Mg alloy materials. Co–Mg metal powders were homogeneously mixed for 24 h to obtain CM alloyed materials. The mixed powders were carefully poured into a cylindrical mold specially designed for shaping under 500 bar pressure in a uniaxial cold press which was followed by attentive pressing. The shaped samples were heat-treated in a conventional tube furnace at 530°C for 2 h in an atmosphere-controlled environment.

In the boriding process, nano-sized Ekabor II powder mixtures were poured under and over the samples in a stainless steel crucible. The top and lid of the box were properly sealed with chamotte mud to prevent samples from oxidizing by heat. The samples were heated in an oven at 850–900°C for 1.5–4.5 h. Figure 1 shows the placement of CM alloys both in the boriding crucible and in the furnace. After this step, the samples were taken out of the oven and allowed to cool in the ambient air. The microstructures of the samples were determined by Nikon MA200 optical microscope. Boriding structures formed in the layers were revealed in Shimadzu XRD 6000. SEM analysis was performed with LEO 1430 VP model SEM instrument. Hardness measurements of the borided and unborided samples were carried out under 50 g loading on the Shimadzu HMV-2 Vickers hardness tester. The reason for preferring the Vickers microhardness test is to make use of its employment in the medium hardness group, thin steel sheet metal, hardened machine parts, cutting tools, mild steel, or all kinds of non-steel materials [36].

Figure 1 Placement of CM alloys in boring crucibles and in furnaces.
Figure 1

Placement of CM alloys in boring crucibles and in furnaces.

Furthermore, a wear test was applied to the boronized samples as a mechanical test. The abrasion test was carried out using a ball placed on a disk that rotates mechanically at a certain speed. In this mechanism, samples are tightly placed at the bottom. This table rotates and moves so that the ball touches the sample surface. In the experimental procedure, 8 mm diameter WC–Co-based balls were used for abrasion. Abrasion tests were carried out under 10 N load under dry friction conditions at room temperature atmosphere, 0.3 m/s sliding speed, and 250 m sliding distance (Figure 2).

Figure 2 The schematic of wear test performed in the present study [36,37].
Figure 2

The schematic of wear test performed in the present study [36,37].

Surface roughness measurements were performed on the samples. The averages (R a) of these measurements were taken. R a value is calculated according to the equation below.

(1) R a = P area + Q area L 1 , 000 V q ,

where P and Q are the areas (mm2), L is the length (mm), and V q represents the vertical magnification value. The measurement was carried out with the PCE-RT1100 instrument.

Before and after each wear test, every single sample and abrasion element was cleaned with alcohol. After the test, the wear volumes of the samples were quantified by multiplying the cross-sectional areas of the wear by the width of the wear track obtained from the Taylor–Hobson Rugosimeter Surtronic 25 device. The wear rate was calculated with the equation:

(2) W k = W v M ⋅ S mm 3 N m ,

where W k is the wear rate, W v is the worn volume, M is the applied load, and S is the sliding distance. Friction coefficients depending on sliding distance were obtained through a friction coefficient program. Surface profiles of the wear tracks on the samples and surface roughness were measured by a Taylor–Hobson Rugosimeter Surtronic 25.

3 Results and discussion

3.1 SEM analysis of boriding coatings

SEM analysis images of 97% Co–3% Mg alloys heated at 850–900°C for 1.5–4.5 h are shown in Figure 3a–d. As can be seen from the figures, the boride layers formed on the CM alloy base materials have saw-tooth morphology and these layer thicknesses are clearly seen to depend on the temperature and time increase. Due to the melting of the element Mg at high temperatures and its rapid deterioration in air, it has formed a partially porous structure in the microstructure.

Figure 3 The layer-section of borided 97% Co–3% Mg alloys: (a) 850°C-1.5 h, (b) 850°C-4.5 h, (c) 900°C-1.5 h, and (d) 900°C-4.5 h.
Figure 3

The layer-section of borided 97% Co–3% Mg alloys: (a) 850°C-1.5 h, (b) 850°C-4.5 h, (c) 900°C-1.5 h, and (d) 900°C-4.5 h.

In Figure 4, the layer thickness on the surface was obtained to be between 5,133–13,866 µm, depending on the chemical composition, time, and temperature after the boriding of 97%Co–3%Mg alloys. The saw-tooth morphology in the layer changes depending on the element Mg in CM alloys. The thickness of the boron layer varies with respect to temperature and time. Additionally, we found that Co and Mg elements move towards the matrix. As a result, it has been observed that the boride layers grow in this direction. Likewise, in our previous study, Yıldız et al. [38] also examined the boriding of the Fe–Mg alloy and found that after boriding, Mg forms pores in Fe and prevents the growth of the boride layer.

Figure 4 Boron layer thicknesses in CM alloys according to the applied temperature and time.
Figure 4

Boron layer thicknesses in CM alloys according to the applied temperature and time.

3.2 XRD analysis

Figure 5a–d shows the XRD patterns of 97% Co–3% Mg alloys borided after changing temperatures of 850–900°C and different times of 1.5–4.5 h. XRD results show that cobalt-structured boron layers are predominantly formed. These results mean that CM alloys contain CoB, Co2B, and Co phases with boride layers after boriding. CoB and Co2B phase values increase due to the increase in boriding temperature and time. In this case, it strengthens the diffusion bond between the base material and the boride layer and therefore it affects the strength of the alloy material. In the recent literature, Oh et al. [39] focused on producing cobalt–boron alloys by mixing cobalt and boron powders under the gas atmosphere of Ar–N2 and Ar–H2 in the thermal plasma jet system. Their report revealed various structures such as Co, CoB, and Co2B phases in nanoparticle synthesis. Similarly, Delgado-Brito et al. [40] conducted a powder package boriding process on the surface of ASTM F1537 alloy at 1,273 K for 6 h. They found that CoB and Co2B layers were formed on the alloy surface after boriding. As can be appreciated from some recent investigations, CoB and Co2B phase structures emerged as 45–50 as the 2θ angle at most. A detailed view of the CoB and Co2B phases is given in Figure 6b and c.

Figure 5 XRD analysis results of borided 97% Co–3% Mg alloys: (a) 850°C-1.5 h, (b) 850°C-4.5 h, (c) 900°C-1.5 h, and (d) 900°C-4.5 h.
Figure 5

XRD analysis results of borided 97% Co–3% Mg alloys: (a) 850°C-1.5 h, (b) 850°C-4.5 h, (c) 900°C-1.5 h, and (d) 900°C-4.5 h.

Figure 6 CoB and Co2B XRD phase structures revealed in the literature. Detailed view of figure 6–b CoB, CoB and Co2B phases in Figure 6–c [39,40].
Figure 6

CoB and Co2B XRD phase structures revealed in the literature. Detailed view of figure 6–b CoB, CoB and Co2B phases in Figure 6–c [39,40].

3.3 Microhardness test

Figure 7 shows the microhardness values of borided 97% Co–3% Mg alloy materials at a temperature of 850–900°C for 1.5–4.5 h. After this process, the results were obtained by the average of the microhardness measurements made from at least eight different regions along the cross-section of each sample. Based upon the findings, one can state that an increase appears in parallel with the increase in the temperature and time variables.

Figure 7 The variation in hardness depth of borided CM alloys depending on the applied temperature and time.
Figure 7

The variation in hardness depth of borided CM alloys depending on the applied temperature and time.

Accordingly, the lowest value was obtained as 1,674 HV0.05 after 1.5 h at 850°C, while the highest value was found as 1,956 HV0.05 at 900°C after 4.5 h. On the other hand, Vickers hardness value of unborided 97% Co–3% Mg alloys was found to be 52 HV0.05. When it comes to comparing these findings with some literature studies, Johnston et al. [41], for instance, obtained a 2,549 HV hardness value on borided cobalt–chromium alloys by plasma boriding method. Further, Cuao-Moreu et al. [42] figured out the hardness values of 1,835–2,243 HV after processing at the temperatures of 1,223, 1,248, and 1,273 K for periods of 6, 8, and 10 h on the borided Co–Cr–Mo alloys. For these reasons, we can say that our findings are promising for enhancing microhardness values.

3.4 Surface roughness and density

A surface roughness test was performed on the samples after the boriding method. As a result of the surface roughness test, R a values of CM alloys are found between 0.3 and 0.62 µm. In addition to this test, a density test was also performed using Archimedes’ principle. The results vary between 7.32 and 7.57 g/cm3. It is apparent that both parameters increase with the changing parameters. The reason for this increment can be associated with the evaporation of magnesium elements in the alloy at high boriding temperatures creating porosity in the structure. Such phenomenon can also be referred as due to the low melting temperature of the element Mg [43,44].

3.5 Wear test

In Figure 8, the friction coefficients emerge after the wear test was performed on borided and unborided CM alloys. The surface roughness values of the materials have increased due to the increase in the boriding temperature and time. In this case, the friction coefficients have increased, as well.

Figure 8 Friction coefficients of borided and unborided CM alloys.
Figure 8

Friction coefficients of borided and unborided CM alloys.

Figure 9 reveals the wear rate of the unborided and borided CM alloys. It is clear from the figure that wear rates have decreased in borided samples. The hardness values of the samples after boriding have also increased; therefore, the wear rates have decreased. The main reason for this situation is shown as the emergence of CoB and Co2B phase structures within the structure. Because these phases have rigid and strength structures, lowest wear rate is observed in the alloys subjected to boriding at 900°C temperature for 4.5 h. While the rate of wear is measured as 94.95 × 10−5 mm3/N m in the unborided alloy, this value is found to be 25.89 × 10−5 mm3/N m in the borided alloy. In the wear region of the borided 97% Co–3% Mg alloy samples, debris, delamination wear, surface grooves, and cracks on the surface can be observed (Figure 9a, c, e, and g). First, micro-cracks occur in the boride layers. These formations are occurred due to the load and friction applied to the sample surfaces. These broken boride layers increase the formation of abrasive wear in the wear zone of the sample. As a result, delamination eventuates. Chipise et al. [45] examined the slip and wear of WC–VC–Co alloys by adding Ru at different rates, and they obtained a decrease in the wear rates on the material surface as the additive rates increased. Therefore, our findings are in good agreement with the literature reports.

Figure 9 Wear rate of borided and unborided CM alloys.
Figure 9

Wear rate of borided and unborided CM alloys.

Figure 10 displays the abrasion surfaces and cross-sectional surface (CS) in samples of the wear mark acquired from the wear area by analyzing multiple profilometry surface line scans using the Nanovea ST-400 non-contact optical profiler. It is observable that the conditions such as abrasion and voids on the surfaces of the samples decreased due to the increase in the boriding temperature and time (Figure 10b, d, f, and h).

Figure 10 The SEM micrograph and CS of the worn out surfaces of the compositions; (a) 850°C-1.5 h, (b) 850°C-1.5 h CS, (c) 850°C-4.5 h, (d) 850°C-4.5 h CS, (e) 900°C-1.5 h, (f) 900°C-1.5 h CS, (g) 900°C-4.5 h, and (h) 900°C-4.5 h CS.
Figure 10

The SEM micrograph and CS of the worn out surfaces of the compositions; (a) 850°C-1.5 h, (b) 850°C-1.5 h CS, (c) 850°C-4.5 h, (d) 850°C-4.5 h CS, (e) 900°C-1.5 h, (f) 900°C-1.5 h CS, (g) 900°C-4.5 h, and (h) 900°C-4.5 h CS.

The results of EDX analysis performed after the wear test on 97% Co 900°C-1.5 h and 97% Co 900°C-4.5 h borided alloys are shown in Figures 11 and 12. As a conclusion of the linear analysis performed after the wear test, Mg and O elements are revealed beside the Co element. As a result of EDX analysis applied to the wear zone of the borided CM alloy, oxide and heat occur on the surface of the sample as a result of the ball rotating and rubbing on the sample during wear. Therefore, Co x O y and Mg x O y phases were formed in EDX analysis.

Figure 11 The EDX analysis obtained from 97% Co 900°C-1.5 h borided alloys.
Figure 11

The EDX analysis obtained from 97% Co 900°C-1.5 h borided alloys.

Figure 12 The EDX analysis obtained from 97% Co 900°C-4.5 h borided alloys.
Figure 12

The EDX analysis obtained from 97% Co 900°C-4.5 h borided alloys.

4 Conclusion

The following conclusions may be derived from the present study:

  • Boride types formed on the surface of the CM alloys have a smooth and flat morphology. XRD results on borided alloys showed that boron layers formed on CM alloys contain CoB, Co2B, and Co phases.

  • Depending on the chemical composition of the alloys, and the time and temperature of the boriding, the thickness of the boride layer formed on the surface of 97% Co–3% Mg alloys ranged from 51 to 138 µm.

  • While the hardness of the boride layer formed as a result of boriding due to temperature and time depending on the CM alloys varied between 1,674 and 1,956 HV0.05, Vickers hardness value of the unborided CM alloys was 52 HV0.05.

  • Surface roughness values of borided samples vary between 0.3–0.62 µm and their density between 7.32 and 7.57 g/cm3. The friction coefficient of values (between 0.54 and 0.7) for the boriding samples were lower than the coefficient of friction values (0.9) of the unborided alloys sample.

  • The wear rate of the unborided sample was 94.95 × 10−5 mm3/N m: however, this value dropped to 25.89 × 10−5 mm3/N m as a result of the boriding process. In the wear region of the borided sample was observed debris, adhesion, abrasive, delamination wear, surface grooves, and cracks on the surface.

Acknowledgements

This study was supported by Afyon Kocatepe University BAPK 17.MYO.05. Many thanks to the Scientific Research Projects Commission for their support.

  1. Funding information: This work was supported by the AKU BAPK 17.MYO.05 projects unit with 14467 Turkish Liras.

  2. Conflict of interest: Author states no conflict of interest.

  3. Ethical approval: The conducted research is not related to either human or animal use.

  4. Data availability statement: All data generated or analyzed during this study are included in this published article [and its supplementary information files].

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Received: 2022-01-05
Revised: 2022-01-20
Accepted: 2022-01-26
Published Online: 2022-03-24

© 2022 Ismail Yıldız, published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

Articles in the same Issue

  1. Regular Articles
  2. Photocatalytic degradation of Rhodamine B in aqueous phase by bimetallic metal-organic framework M/Fe-MOF (M = Co, Cu, and Mg)
  3. Assessment of using electronic portal imaging device for analysing bolus material utilised in radiation therapy
  4. A detailed investigation on highly dense CuZr bulk metallic glasses for shielding purposes
  5. Simulation of gamma-ray shielding properties for materials of medical interest
  6. Environmental impact assesment regulation applications and their analysis in Turkey
  7. Sample age effect on parameters of dynamic nuclear polarization in certain difluorobenzen isomers/MC800 asphaltene suspensions
  8. Passenger demand forecasting for railway systems
  9. Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach
  10. Gamma, neutron, and heavy charged ion shielding properties of Er3+-doped and Sm3+-doped zinc borate glasses
  11. Bridging chiral de-tert-butylcalix[4]arenes: Optical resolution based on column chromatography and structural characterization
  12. Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt
  13. Comparison of the yield and purity of plasma exosomes extracted by ultracentrifugation, precipitation, and membrane-based approaches
  14. Bioactive triterpenoids from Indonesian medicinal plant Syzygium aqueum
  15. Investigation of the effects of machining parameters on surface integrity in micromachining
  16. The mesoporous aluminosilicate application as support for bifunctional catalysts for n-hexadecane hydroconversion
  17. Gamma-ray shielding properties of Nd2O3-added iron–boron–phosphate-based composites
  18. Numerical investigation on perforated sheet metals under tension loading
  19. Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt
  20. Two new polypodane-type bicyclic triterpenoids from mastic
  21. Structural, physical, and mechanical properties of the TiO2 added hydroxyapatite composites
  22. Tribological properties and characterization of borided Co–Mg alloys
  23. Studies on Anemone nemorosa L. extracts; polyphenols profile, antioxidant activity, and effects on Caco-2 cells by in vitro and in silico studies
  24. Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system
  25. Cyclic connectivity index of bipolar fuzzy incidence graph
  26. The role of passage numbers of donor cells in the development of Arabian Oryx – Cow interspecific somatic cell nuclear transfer embryos
  27. Mechanical property evaluation of tellurite–germanate glasses and comparison of their radiation-shielding characteristics using EPICS2017 to other glass systems
  28. Molecular screening of ionic liquids for CO2 absorption and molecular dynamic simulation
  29. Microwave-assisted preparation of Ag/Fe magnetic biochar from clivia leaves for adsorbing daptomycin antibiotics
  30. Iminodisuccinic acid enhances antioxidant and mineral element accumulation in young leaves of Ziziphus jujuba
  31. Cytotoxic activity of guaiane-type sesquiterpene lactone (deoxycynaropicrin) isolated from the leaves of Centaurothamnus maximus
  32. Effects of welding parameters on the angular distortion of welded steel plates
  33. Simulation of a reactor considering the Stamicarbon, Snamprogetti, and Toyo patents for obtaining urea
  34. Effect of different ramie (Boehmeria nivea L. Gaud) cultivars on the adsorption of heavy metal ions cadmium and lead in the remediation of contaminated farmland soils
  35. Impact of a live bacterial-based direct-fed microbial (DFM) postpartum and weaning system on performance, mortality, and health of Najdi lambs
  36. Anti-tumor effect of liposomes containing extracted Murrayafoline A against liver cancer cells in 2D and 3D cultured models
  37. Physicochemical properties and some mineral concentration of milk samples from different animals and altitudes
  38. Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies
  39. Diagnostic and therapeutic radioisotopes in nuclear medicine: Determination of gamma-ray transmission factors and safety competencies of high-dense and transparent glassy shields
  40. Calculation of NaI(Tl) detector efficiency using 226Ra, 232Th, and 40K radioisotopes: Three-phase Monte Carlo simulation study
  41. Isolation and identification of unstable components from Caesalpinia sappan by high-speed counter-current chromatography combined with preparative high-performance liquid chromatography
  42. Quantification of biomarkers and evaluation of antioxidant, anti-inflammatory, and cytotoxicity properties of Dodonaea viscosa grown in Saudi Arabia using HPTLC technique
  43. Characterization of the elastic modulus of ceramic–metal composites with physical and mechanical properties by ultrasonic technique
  44. GC-MS analysis of Vespa velutina auraria Smith and its anti-inflammatory and antioxidant activities in vitro
  45. Texturing of nanocoatings for surface acoustic wave-based sensors for volatile organic compounds
  46. Insights into the molecular basis of some chalcone analogues as potential inhibitors of Leishmania donovani: An integrated in silico and in vitro study
  47. (1R,2S,5R)-5-Methyl-2-(propan-2-yl)cyclohexyl 4-amino-3-phenylbutanoate hydrochloride: Synthesis and anticonvulsant activity
  48. On the relative extraction rates of colour compounds and caffeine during brewing, an investigation of tea over time and temperature
  49. Characterization of egg shell powder-doped ceramic–metal composites
  50. Rapeseed oil-based hippurate amide nanocomposite coating material for anticorrosive and antibacterial applications
  51. Chemically modified Teucrium polium (Lamiaceae) plant act as an effective adsorbent tool for potassium permanganate (KMnO4) in wastewater remediation
  52. Efficiency analysis of photovoltaic systems installed in different geographical locations
  53. Risk prioritization model driven by success factor in the light of multicriteria decision making
  54. Theoretical investigations on the excited-state intramolecular proton transfer in the solvated 2-hydroxy-1-naphthaldehyde carbohydrazone
  55. Mechanical and gamma-ray shielding examinations of Bi2O3–PbO–CdO–B2O3 glass system
  56. Machine learning-based forecasting of potability of drinking water through adaptive boosting model
  57. The potential effect of the Rumex vesicarius water seeds extract treatment on mice before and during pregnancy on the serum enzymes and the histology of kidney and liver
  58. Impact of benzimidazole functional groups on the n-doping properties of benzimidazole derivatives
  59. Extraction of red pigment from Chinese jujube peel and the antioxidant activity of the pigment extracts
  60. Flexural strength and thermal properties of carbon black nanoparticle reinforced epoxy composites obtained from waste tires
  61. A focusing study on radioprotective and antioxidant effects of Annona muricata leaf extract in the circulation and liver tissue: Clinical and experimental studies
  62. Clinical comprehensive and experimental assessment of the radioprotective effect of Annona muricata leaf extract to prevent cellular damage in the ileum tissue
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  65. The synthesis of nanocellulose-based nanocomposites for the effective removal of hexavalent chromium ions from aqueous solution
  66. Study on the influence of physical interlayers on the remaining oil production under different development modes
  67. Optimized linear regression control of DC motor under various disturbances
  68. Influence of different sample preparation strategies on hypothesis-driven shotgun proteomic analysis of human saliva
  69. Determination of flow distance of the fluid metal due to fluidity in ductile iron casting by artificial neural networks approach
  70. Investigation of mechanical activation effect on high-volume natural pozzolanic cements
  71. In vitro: Anti-coccidia activity of Calotropis procera leaf extract on Eimeria papillata oocysts sporulation and sporozoite
  72. Determination of oil composition of cowpea (Vigna unguiculata L.) seeds under influence of organic fertilizer forms
  73. Activated partial thromboplastin time maybe associated with the prognosis of papillary thyroid carcinoma
  74. Treatment of rat brain ischemia model by NSCs-polymer scaffold transplantation
  75. Lead and cadmium removal with native yeast from coastal wetlands
  76. Characterization of electroless Ni-coated Fe–Co composite using powder metallurgy
  77. Ferrate synthesis using NaOCl and its application for dye removal
  78. Antioxidant, antidiabetic, and anticholinesterase potential of Chenopodium murale L. extracts using in vitro and in vivo approaches
  79. Study on essential oil, antioxidant activity, anti-human prostate cancer effects, and induction of apoptosis by Equisetum arvense
  80. Experimental study on turning machine with permanent magnetic cutting tool
  81. Numerical simulation and mathematical modeling of the casting process for pearlitic spheroidal graphite cast iron
  82. Design, synthesis, and cytotoxicity evaluation of novel thiophene, pyrimidine, pyridazine, and pyridine: Griseofulvin heterocyclic extension derivatives
  83. Isolation and identification of promising antibiotic-producing bacteria
  84. Ultrasonic-induced reversible blood–brain barrier opening: Safety evaluation into the cellular level
  85. Evaluation of phytochemical and antioxidant potential of various extracts from traditionally used medicinal plants of Pakistan
  86. Effect of calcium lactate in standard diet on selected markers of oxidative stress and inflammation in ovariectomized rats
  87. Identification of crucial salivary proteins/genes and pathways involved in pathogenesis of temporomandibular disorders
  88. Zirconium-modified attapulgite was used for removing of Cr(vi) in aqueous solution
  89. The stress distribution of different types of restorative materials in primary molar
  90. Reducing surface heat loss in steam boilers
  91. Deformation behavior and formability of friction stir processed DP600 steel
  92. Synthesis and characterization of bismuth oxide/commercial activated carbon composite for battery anode
  93. Phytochemical analysis of Ziziphus jujube leaf at different foliar ages based on widely targeted metabolomics
  94. Effects of in ovo injection of black cumin (Nigella sativa) extract on hatching performance of broiler eggs
  95. Separation and evaluation of potential antioxidant, analgesic, and anti-inflammatory activities of limonene-rich essential oils from Citrus sinensis (L.)
  96. Bioactivity of a polyhydroxy gorgostane steroid from Xenia umbellata
  97. BiCAM-based automated scoring system for digital logic circuit diagrams
  98. Analysis of standard systems with solar monitoring systems
  99. Structural and spectroscopic properties of voriconazole and fluconazole – Experimental and theoretical studies
  100. New plant resistance inducers based on polyamines
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  102. Investigation of inlet air pressure and evaporative cooling of four different cogeneration cycles
  103. Review Articles
  104. Comprehensive review on synthesis, physicochemical properties, and application of activated carbon from the Arecaceae plants for enhanced wastewater treatment
  105. Research progress on speciation analysis of arsenic in traditional Chinese medicine
  106. Recent modified air-assisted liquid–liquid microextraction applications for medicines and organic compounds in various samples: A review
  107. An insight on Vietnamese bio-waste materials as activated carbon precursors for multiple applications in environmental protection
  108. Antimicrobial activities of the extracts and secondary metabolites from Clausena genus – A review
  109. Bioremediation of organic/heavy metal contaminants by mixed cultures of microorganisms: A review
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  111. Recent progress of amino acid transporters as a novel antitumor target
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  118. Corrigendum to “Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system”
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https://doi.org/10.1515/chem-2022-0133
Keywords for this article
Co–Mg alloys; surface roughness; borided; wear
Creative Commons
BY 4.0

Articles in the same Issue

  1. Regular Articles
  2. Photocatalytic degradation of Rhodamine B in aqueous phase by bimetallic metal-organic framework M/Fe-MOF (M = Co, Cu, and Mg)
  3. Assessment of using electronic portal imaging device for analysing bolus material utilised in radiation therapy
  4. A detailed investigation on highly dense CuZr bulk metallic glasses for shielding purposes
  5. Simulation of gamma-ray shielding properties for materials of medical interest
  6. Environmental impact assesment regulation applications and their analysis in Turkey
  7. Sample age effect on parameters of dynamic nuclear polarization in certain difluorobenzen isomers/MC800 asphaltene suspensions
  8. Passenger demand forecasting for railway systems
  9. Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach
  10. Gamma, neutron, and heavy charged ion shielding properties of Er3+-doped and Sm3+-doped zinc borate glasses
  11. Bridging chiral de-tert-butylcalix[4]arenes: Optical resolution based on column chromatography and structural characterization
  12. Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt
  13. Comparison of the yield and purity of plasma exosomes extracted by ultracentrifugation, precipitation, and membrane-based approaches
  14. Bioactive triterpenoids from Indonesian medicinal plant Syzygium aqueum
  15. Investigation of the effects of machining parameters on surface integrity in micromachining
  16. The mesoporous aluminosilicate application as support for bifunctional catalysts for n-hexadecane hydroconversion
  17. Gamma-ray shielding properties of Nd2O3-added iron–boron–phosphate-based composites
  18. Numerical investigation on perforated sheet metals under tension loading
  19. Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt
  20. Two new polypodane-type bicyclic triterpenoids from mastic
  21. Structural, physical, and mechanical properties of the TiO2 added hydroxyapatite composites
  22. Tribological properties and characterization of borided Co–Mg alloys
  23. Studies on Anemone nemorosa L. extracts; polyphenols profile, antioxidant activity, and effects on Caco-2 cells by in vitro and in silico studies
  24. Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system
  25. Cyclic connectivity index of bipolar fuzzy incidence graph
  26. The role of passage numbers of donor cells in the development of Arabian Oryx – Cow interspecific somatic cell nuclear transfer embryos
  27. Mechanical property evaluation of tellurite–germanate glasses and comparison of their radiation-shielding characteristics using EPICS2017 to other glass systems
  28. Molecular screening of ionic liquids for CO2 absorption and molecular dynamic simulation
  29. Microwave-assisted preparation of Ag/Fe magnetic biochar from clivia leaves for adsorbing daptomycin antibiotics
  30. Iminodisuccinic acid enhances antioxidant and mineral element accumulation in young leaves of Ziziphus jujuba
  31. Cytotoxic activity of guaiane-type sesquiterpene lactone (deoxycynaropicrin) isolated from the leaves of Centaurothamnus maximus
  32. Effects of welding parameters on the angular distortion of welded steel plates
  33. Simulation of a reactor considering the Stamicarbon, Snamprogetti, and Toyo patents for obtaining urea
  34. Effect of different ramie (Boehmeria nivea L. Gaud) cultivars on the adsorption of heavy metal ions cadmium and lead in the remediation of contaminated farmland soils
  35. Impact of a live bacterial-based direct-fed microbial (DFM) postpartum and weaning system on performance, mortality, and health of Najdi lambs
  36. Anti-tumor effect of liposomes containing extracted Murrayafoline A against liver cancer cells in 2D and 3D cultured models
  37. Physicochemical properties and some mineral concentration of milk samples from different animals and altitudes
  38. Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies
  39. Diagnostic and therapeutic radioisotopes in nuclear medicine: Determination of gamma-ray transmission factors and safety competencies of high-dense and transparent glassy shields
  40. Calculation of NaI(Tl) detector efficiency using 226Ra, 232Th, and 40K radioisotopes: Three-phase Monte Carlo simulation study
  41. Isolation and identification of unstable components from Caesalpinia sappan by high-speed counter-current chromatography combined with preparative high-performance liquid chromatography
  42. Quantification of biomarkers and evaluation of antioxidant, anti-inflammatory, and cytotoxicity properties of Dodonaea viscosa grown in Saudi Arabia using HPTLC technique
  43. Characterization of the elastic modulus of ceramic–metal composites with physical and mechanical properties by ultrasonic technique
  44. GC-MS analysis of Vespa velutina auraria Smith and its anti-inflammatory and antioxidant activities in vitro
  45. Texturing of nanocoatings for surface acoustic wave-based sensors for volatile organic compounds
  46. Insights into the molecular basis of some chalcone analogues as potential inhibitors of Leishmania donovani: An integrated in silico and in vitro study
  47. (1R,2S,5R)-5-Methyl-2-(propan-2-yl)cyclohexyl 4-amino-3-phenylbutanoate hydrochloride: Synthesis and anticonvulsant activity
  48. On the relative extraction rates of colour compounds and caffeine during brewing, an investigation of tea over time and temperature
  49. Characterization of egg shell powder-doped ceramic–metal composites
  50. Rapeseed oil-based hippurate amide nanocomposite coating material for anticorrosive and antibacterial applications
  51. Chemically modified Teucrium polium (Lamiaceae) plant act as an effective adsorbent tool for potassium permanganate (KMnO4) in wastewater remediation
  52. Efficiency analysis of photovoltaic systems installed in different geographical locations
  53. Risk prioritization model driven by success factor in the light of multicriteria decision making
  54. Theoretical investigations on the excited-state intramolecular proton transfer in the solvated 2-hydroxy-1-naphthaldehyde carbohydrazone
  55. Mechanical and gamma-ray shielding examinations of Bi2O3–PbO–CdO–B2O3 glass system
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  57. The potential effect of the Rumex vesicarius water seeds extract treatment on mice before and during pregnancy on the serum enzymes and the histology of kidney and liver
  58. Impact of benzimidazole functional groups on the n-doping properties of benzimidazole derivatives
  59. Extraction of red pigment from Chinese jujube peel and the antioxidant activity of the pigment extracts
  60. Flexural strength and thermal properties of carbon black nanoparticle reinforced epoxy composites obtained from waste tires
  61. A focusing study on radioprotective and antioxidant effects of Annona muricata leaf extract in the circulation and liver tissue: Clinical and experimental studies
  62. Clinical comprehensive and experimental assessment of the radioprotective effect of Annona muricata leaf extract to prevent cellular damage in the ileum tissue
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  64. Influence of various class cleaning agents for prosthesis on Co–Cr alloy surface
  65. The synthesis of nanocellulose-based nanocomposites for the effective removal of hexavalent chromium ions from aqueous solution
  66. Study on the influence of physical interlayers on the remaining oil production under different development modes
  67. Optimized linear regression control of DC motor under various disturbances
  68. Influence of different sample preparation strategies on hypothesis-driven shotgun proteomic analysis of human saliva
  69. Determination of flow distance of the fluid metal due to fluidity in ductile iron casting by artificial neural networks approach
  70. Investigation of mechanical activation effect on high-volume natural pozzolanic cements
  71. In vitro: Anti-coccidia activity of Calotropis procera leaf extract on Eimeria papillata oocysts sporulation and sporozoite
  72. Determination of oil composition of cowpea (Vigna unguiculata L.) seeds under influence of organic fertilizer forms
  73. Activated partial thromboplastin time maybe associated with the prognosis of papillary thyroid carcinoma
  74. Treatment of rat brain ischemia model by NSCs-polymer scaffold transplantation
  75. Lead and cadmium removal with native yeast from coastal wetlands
  76. Characterization of electroless Ni-coated Fe–Co composite using powder metallurgy
  77. Ferrate synthesis using NaOCl and its application for dye removal
  78. Antioxidant, antidiabetic, and anticholinesterase potential of Chenopodium murale L. extracts using in vitro and in vivo approaches
  79. Study on essential oil, antioxidant activity, anti-human prostate cancer effects, and induction of apoptosis by Equisetum arvense
  80. Experimental study on turning machine with permanent magnetic cutting tool
  81. Numerical simulation and mathematical modeling of the casting process for pearlitic spheroidal graphite cast iron
  82. Design, synthesis, and cytotoxicity evaluation of novel thiophene, pyrimidine, pyridazine, and pyridine: Griseofulvin heterocyclic extension derivatives
  83. Isolation and identification of promising antibiotic-producing bacteria
  84. Ultrasonic-induced reversible blood–brain barrier opening: Safety evaluation into the cellular level
  85. Evaluation of phytochemical and antioxidant potential of various extracts from traditionally used medicinal plants of Pakistan
  86. Effect of calcium lactate in standard diet on selected markers of oxidative stress and inflammation in ovariectomized rats
  87. Identification of crucial salivary proteins/genes and pathways involved in pathogenesis of temporomandibular disorders
  88. Zirconium-modified attapulgite was used for removing of Cr(vi) in aqueous solution
  89. The stress distribution of different types of restorative materials in primary molar
  90. Reducing surface heat loss in steam boilers
  91. Deformation behavior and formability of friction stir processed DP600 steel
  92. Synthesis and characterization of bismuth oxide/commercial activated carbon composite for battery anode
  93. Phytochemical analysis of Ziziphus jujube leaf at different foliar ages based on widely targeted metabolomics
  94. Effects of in ovo injection of black cumin (Nigella sativa) extract on hatching performance of broiler eggs
  95. Separation and evaluation of potential antioxidant, analgesic, and anti-inflammatory activities of limonene-rich essential oils from Citrus sinensis (L.)
  96. Bioactivity of a polyhydroxy gorgostane steroid from Xenia umbellata
  97. BiCAM-based automated scoring system for digital logic circuit diagrams
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  99. Structural and spectroscopic properties of voriconazole and fluconazole – Experimental and theoretical studies
  100. New plant resistance inducers based on polyamines
  101. Experimental investigation of single-lap bolted and bolted/bonded (hybrid) joints of polymeric plates
  102. Investigation of inlet air pressure and evaporative cooling of four different cogeneration cycles
  103. Review Articles
  104. Comprehensive review on synthesis, physicochemical properties, and application of activated carbon from the Arecaceae plants for enhanced wastewater treatment
  105. Research progress on speciation analysis of arsenic in traditional Chinese medicine
  106. Recent modified air-assisted liquid–liquid microextraction applications for medicines and organic compounds in various samples: A review
  107. An insight on Vietnamese bio-waste materials as activated carbon precursors for multiple applications in environmental protection
  108. Antimicrobial activities of the extracts and secondary metabolites from Clausena genus – A review
  109. Bioremediation of organic/heavy metal contaminants by mixed cultures of microorganisms: A review
  110. Sonodynamic therapy for breast cancer: A literature review
  111. Recent progress of amino acid transporters as a novel antitumor target
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  113. Corrigendum
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  118. Corrigendum to “Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system”
  119. Erratum
  120. Erratum to “Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies”
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  122. Study of solidification and stabilization of heavy metals by passivators in heavy metal-contaminated soil
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  129. Studies on the chemical composition of plants used in traditional medicine in Congo
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  138. Ethnopharmacological study of medicinal plants in Kastamonu province (Türkiye)
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  146. Antifungal–antiproliferative norcycloartane-type triterpenes from the Red Sea green alga Tydemania expeditionis
  147. Solvent effect, dipole moment, and DFT studies of multi donor–acceptor type pyridine derivative
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  160. Phytochemical analysis of leaves and stems of Physalis alkekengi L. (Solanaceae)
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  168. Special Issue on Advanced Nanomaterials for Energy, Environmental and Biological Applications - Part I
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