Tribological properties of boronized ferrous based PM journal bearings
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Bekir Sadık Ünlü
Abstract
Ferrous based PM (powder metallurgical) materials are widely used in journal bearings since they provide a good tribological performance. These bearings are self-lubricating and can be used in places where lubricating is not possible. This also applies to the shaft material which shows adhesive wear. Tribological properties can be improved and adhesive wear can be decreased by boronizing. In this study, tribological properties of ferrous based boronized and non-boronized Fe-graphite, FeCu-graphite and CuSnFe-graphite bearings manufactured by PM method have been determined and compared. Boronizing treatment was carried out at 950° C for 4 hours. The SAE 1050 steel shaft was used as counter abrader. Experiments were carried out at 20 N loads and 1500 rpm every 30 minutes for 2.5 hours.
Kurzfassung
Eisenbasierte pulvermetallurgische PM-Werkstoffe werden breitflächig für Gleitlager verwendet, da sie gute tribologische Eigenschaften aufweisen. Solche Gleitlager sind selbstschmierend und können an Stellen, wo eine Schmierung nicht möglich ist, verwendet werden. Dies betrifft auch das Schaftmaterial, wo sich Adhäsivverschleiß zeigt. Die tribologischen Eigenschaften werden verbessert und der Adhäsivverschleiß mittels Borieren vermindert. In der diesem Beitrag zugrundeliegenden Studie wurden die tribologischen Eigenschaften von borierten und nicht borierten Gleitlagern aus Eisengraphit, Eeisenkupfergraphit und Eisen-Zinn-Kupfergraphit, die mittels Pulvermetallurgie (PM) hergestellt wurden, untersucht und miteinander verglichen. Die Borierbehandlung wurde bei 950 °C über 4 h ausgeführt. Der Schaft aus dem Stahl SAE 1050 wurde als Gegenabrieb verwendet. Die Experimente wurden jeweils bei einer Kraft von 20 N und Umdrehungszahlen von 1500 U·min−1 und 2,5 h lang alle 30 Minuten ausgeführt.
References
1 W.Schatt, K.P.Wieters: Powder Metallurgy, Proc. Mater. EPMA, Shrewsbury, UK (1997)Search in Google Scholar
2 Y.Enomoto, T.Yamamoto: New materials in automotive tribology, Tribol. Lett.5 (1998), pp. 13–2410.1023/A:1019100531912Search in Google Scholar
3 T. S.Eyre: Friction and wear control in industry, Surf. Eng.7 (1991), pp. 143–148 ISSN: 0026-0940Search in Google Scholar
4 B. S.Ünlü: Determination of usability of boronized ferrous based materials as bearing and tribological properties in journal bearings, PhD Thesis, Celal Bayar University, Manisa, Turkey (2004) (in Turkish)Search in Google Scholar
5 R.Varol: Wear properties of Cu and Fe based P/M bearing materials, J. Eng.3 (2001), No. 1, pp. 81–90 (in Turkish)Search in Google Scholar
6 A.Ekşi, A.Kurt: Pressing of metal and ceramic powders on unique with axes computer controlled, Proc. of the 2nd Intern. Conf. of Powder Metallurgy, Vol. 2 (1999), pp. 557–565 (in Turkish)Search in Google Scholar
7 A.Demir, S.Sarıtaş: Mechanical properties of powder metal steels, Eng. Fac. J. Mech. Eng.7 (1993), pp. 1–13 (in Turkish)Search in Google Scholar
8 R.Varol, S.Sarıtaş: Effect of shot peening treatment on fatigue properties of ferrous based P/M parts, Proc. of the Intern. Conf. on Powder Metallurgy, Ankara (1996), pp. 407–418 (in Turkish)Search in Google Scholar
9 S.Bradury: Powder Metallurgy Equipment Manual, Vol. 3, Powder Metall. Assoc., New Jersey, USA (1986) OSTI Identifier: 5549923Search in Google Scholar
10 S.Sarıtaş: Powder metallurgy, Eng. Mech. (1992), Vol. 18, pp. 64–82 (in Turkish)VSearch in Google Scholar
11 R.Raman, T.S.Chennabasavan: Experimental investigations of porous bearings under vertical sinusoidally fluctuating loads, Tribol. Int.31 (1998), pp. 325–33010.1016/S0301-679X(98)00041-3Search in Google Scholar
12 F.Arslan, S.Cinbat, A. G.Dönmez: Investigation of manufacturing parameters on porous bronze bearing property, Proc. of the Intern. Conf. on Powder Metallurgy, Ankara, Turkey (1996) (in Turkish)Search in Google Scholar
13 S.Sarıtaş: Fatigue properties of powder metal steels, Eng. Mech. (2003), Vol. 517, pp. 33–41 (in Turkish)Search in Google Scholar
14 A.Kurt: Properties of P/M bronze bearing materials, Master Thesis, Gazi University, Ankara, Turkey (1992) (in Turkish)Search in Google Scholar
15 J. G.Justino, P. A. N.Bernardini: Self-lubricating bearings: Microstructural and dimensional evolution under industrial processing conditions, Mater. Sci. For.299-300 (1999), pp. 356–36310.4028/www.scientific.net/MSF.299-300.356Search in Google Scholar
16 A.Kurt, M.Türker, S.Sarıtaş: Wear properties of P/M copper bearings, Proc. of the Intern. Conf. on Powder Metallurgy, Ankara, Turkey (1996) (in Turkish)Search in Google Scholar
17 A. G.Mathuschka: Boronizing, Carl Hanser, Munich, Germany (1980)Search in Google Scholar
18 I. M.Hutchings: Tribology: Friction and Wear of Engineering Materials, Arnold, London, UK (1992)10.1016/0261-3069(92)90241-9Search in Google Scholar
19 B.Bhushan: Principles and applications of tribology, John Willey & Sons, Inc., New York, USA (1999)10.1108/ilt.1999.51.6.313.1Search in Google Scholar
20 H. J.Hunger, G.Trute: Boronizing to produce wear-resistant surface layers, Heat Treat. Met.2 (1994), pp. 31–39 WOS: A1994NN14700002Search in Google Scholar
21 C.Meriç, S.Sahin, S. S.Yılmaz: Investigation of the effect on boride layer of powder particle size used in boronizing with solid boron yielding substances, Mater. Res. Bull.35 (2000), pp. 2165–217210.1016/S0025-5408(00)00427-XSearch in Google Scholar
22 N.Bozkurt: Surface hardening by boronizing in steels, PhD Thesis, Istanbul Technical University, Istanbul, Turkey (1984) (in Turkish)Search in Google Scholar
23 Z.Göy: Boronizing, Master Thesis, Istanbul Technical University, Istanbul, Turkey (1984) (in Turkish)Search in Google Scholar
24 F. G.Lovshenko, V.T.Vysotskii, L.G.Voroshnin, Z.M.Lovshenko, Diffusional boronizing of sintered steels, Powder Metall. Ceram.17 (1978), pp. 113–11510.1007/BF00796339Search in Google Scholar
25 A.Özsoy: Improvement of boron layer properties, transite zone and main matrix in boronized steel, PhD Thesis, Anadolu University, Eskişehir, Turkey (1996) (in Turkish)Search in Google Scholar
26 E.Atik: Increase of wear strength steels by boronizing, Eng. Mech.38 (1997), pp. 17–20 (in Turkish)Search in Google Scholar
27 E.Atik, B. S.Ünlü, C.Meriç: Design of radial journal bearing wear test rig, Proc. of the 2nd Conf. on Machining Materials Technology, Manisa, Turkey (2001), pp. 98–103 (in Turkish)Search in Google Scholar
28 B. S.Ünlü, E.Atik: Determination of friction coefficient in journal bearings, Mater. Des.28 (2007), pp. 973–97710.1016/j.matdes.2005.09.022Search in Google Scholar
29 S. S.Yılmaz: Effect on physical and mechanical properties of surface hardening treatments of ferrous based PM parts, PhD Thesis, Celal Bayar University, Manisa, Turkey (2004) (in Turkish)Search in Google Scholar
30 R. F.Tunay, R.Varol, S. S.Yılmaz: Effect on mechanical properties of boronizing in P/M steels parts, Proc. of the 3rd Conf. on Powder Metallurgy, Ankara, Turkey (2002), pp. 1221–1228 (in Turkish)Search in Google Scholar
© 2015, Carl Hanser Verlag, München
Articles in the same Issue
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Failure of porcelain coated heating elements used in regenerative air preheaters
- Mechanical characterization by DOE analysis of AA6156-T4 friction stir welded joints in as-welded and post-weld aged condition
- Cold formability of AISI 1020 steel sheets
- Optimierung einer Probenform für den Kreuzzugversuch zur Bestimmung der Grenzformänderung
- Friction weldability of a PA 6 polymer
- A discrete dislocation technique for fatigue microcracks (Part III)
- Flexure behavior of composite cantilevers subjected to different environmental conditions
- Structure investigation of soil aggregates treated with different organic matter using X-ray micro tomography*
- Investigation of the tool effect on the strength of friction stir spot welded aluminum specimens: A comparative study
- Microstructural and mechanical characterization of electric arc furnace (EAF) slag for use as abrasive grit material
- Charring rate of timbers in terms of size, layer material and fire class evaluated by the Taguchi method
- Tribological properties of boronized ferrous based PM journal bearings
- SNMS investigations of thermally sprayed coatings
- Kalender/Calendar
- Kalender
Articles in the same Issue
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Failure of porcelain coated heating elements used in regenerative air preheaters
- Mechanical characterization by DOE analysis of AA6156-T4 friction stir welded joints in as-welded and post-weld aged condition
- Cold formability of AISI 1020 steel sheets
- Optimierung einer Probenform für den Kreuzzugversuch zur Bestimmung der Grenzformänderung
- Friction weldability of a PA 6 polymer
- A discrete dislocation technique for fatigue microcracks (Part III)
- Flexure behavior of composite cantilevers subjected to different environmental conditions
- Structure investigation of soil aggregates treated with different organic matter using X-ray micro tomography*
- Investigation of the tool effect on the strength of friction stir spot welded aluminum specimens: A comparative study
- Microstructural and mechanical characterization of electric arc furnace (EAF) slag for use as abrasive grit material
- Charring rate of timbers in terms of size, layer material and fire class evaluated by the Taguchi method
- Tribological properties of boronized ferrous based PM journal bearings
- SNMS investigations of thermally sprayed coatings
- Kalender/Calendar
- Kalender
