Startseite Mechanical-thermal synthesis of NbB2 powder from Mg/B2O3/Nb powder mixture
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Mechanical-thermal synthesis of NbB2 powder from Mg/B2O3/Nb powder mixture

  • Omid Torabi EMAIL logo , Mohammad Hossein Golabgir , Hamid Tajizadegan und Sanaz Naghibi
Veröffentlicht/Copyright: 27. Oktober 2021
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 106 Heft 6

Abstract

Three different approaches were used for the synthesis of niobium boride using a stoichiometric ratio of Mg–B2O3– Nb powder mixture: (i) thermal ignition, (ii) mechanochemical and (iii) a combined mechanical and thermal activation process. Phase transformation analysis and structural evaluation were carried out by means of differential thermal analysis techniques, X-ray diffractometry, scanning electron microscopy and transmission electron microscopy. During the thermal synthesis, the reaction between Mg and B2O3 partially occurred (liquid state reaction). The desired final phase (NbB2) was poorly obtained. Phase analysis revealed that the NbB2 phase was synthesized after 10 h of high energy ball milling. A pre-milling treatment of the powder mixture up to 2 h significantly reduced the reactions temperature (580 °C). Consequently, NbB2 was prepared simultaneously involving magnesiothermic reduction of B2O3 and reaction between elemental of Nb and boron. Mg3(BO3)2, as major by-product, was formed in noticeable amounts during the thermal process, while its quantity significantly decreased during mechanochemical synthesis and completely eliminated by using the combined mechanical and thermal synthesis.

Keywords: Mechanochemical; NbB2; Magnesiothermic reaction; Thermal process
Omid Torabi Department of Materials Engineering, Najafabad Branch Advanced Materials Research Center Islamic Azad University Isfahan, Po. Box: 517 Iran Tel.: +98(31)4229-1008 Fax.: +98(31)4229-1008

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Received: 2014-12-09
Accepted: 2015-01-23
Published Online: 2021-10-27

© 2015 Carl Hanser Verlag GmbH & Co. KG

Artikel in diesem Heft

  1. Frontmatter
  2. Original Contributions
  3. Study on the σ-phase precipitation of SAF2906 duplex stainless steel
  4. Recovery, recrystallization and diffusion in cold-rolled Ni
  5. Splitting phenomenon in martensitic transformation of X12CrMoWVNbN10-1-1 steel
  6. Deformation behaviour of micro-milled cp-titanium specimens under tensile loading
  7. Mechanical-thermal synthesis of NbB2 powder from Mg/B2O3/Nb powder mixture
  8. Influence of MgO on the phase equilibria in the CuxO–FeOy–MgO –SiO2 system in equilibrium with copper alloy – Part II: Results and discussion
  9. Non-uniform sintering of yttria-stabilized zirconia powder compact
  10. Effect of pH and H2S concentration on sulfide stress corrosion cracking (SSCC) of API 2205 duplex stainless steel
  11. Study of wear and corrosion behavior of cathodic plasma electrolytic deposition of zirconia– hydroxyapatite on titanium and 316L stainless steel in Ringer’s solution
  12. Local structure of explosively welded titanium–stainless steel bimetal
  13. Surface-induced oxidation kinetics and mechanism of oxidation of 2-D carbon fabric in different oxidative environments
  14. Short Communications
  15. Microstructural evaluation of ball-milled nano Al2O3 particulate-reinforced aluminum matrix composite powders
  16. Effect of carbon nanotubes produced by using different methods on electrical and optical properties of zinc oxide–carbon nanotube composite
  17. The impact of injection velocity on the defects in thick components fabricated by inserted metal injection molding
  18. Book Review / Buchbesprechungen
  19. Nanowerkstoffe für Einsteiger
  20. Personal
  21. Conferences
https://doi.org/10.3139/146.111222
Schlagwörter für diesen Artikel
Mechanochemical; NbB2; Magnesiothermic reaction; Thermal process

Artikel in diesem Heft

  1. Frontmatter
  2. Original Contributions
  3. Study on the σ-phase precipitation of SAF2906 duplex stainless steel
  4. Recovery, recrystallization and diffusion in cold-rolled Ni
  5. Splitting phenomenon in martensitic transformation of X12CrMoWVNbN10-1-1 steel
  6. Deformation behaviour of micro-milled cp-titanium specimens under tensile loading
  7. Mechanical-thermal synthesis of NbB2 powder from Mg/B2O3/Nb powder mixture
  8. Influence of MgO on the phase equilibria in the CuxO–FeOy–MgO –SiO2 system in equilibrium with copper alloy – Part II: Results and discussion
  9. Non-uniform sintering of yttria-stabilized zirconia powder compact
  10. Effect of pH and H2S concentration on sulfide stress corrosion cracking (SSCC) of API 2205 duplex stainless steel
  11. Study of wear and corrosion behavior of cathodic plasma electrolytic deposition of zirconia– hydroxyapatite on titanium and 316L stainless steel in Ringer’s solution
  12. Local structure of explosively welded titanium–stainless steel bimetal
  13. Surface-induced oxidation kinetics and mechanism of oxidation of 2-D carbon fabric in different oxidative environments
  14. Short Communications
  15. Microstructural evaluation of ball-milled nano Al2O3 particulate-reinforced aluminum matrix composite powders
  16. Effect of carbon nanotubes produced by using different methods on electrical and optical properties of zinc oxide–carbon nanotube composite
  17. The impact of injection velocity on the defects in thick components fabricated by inserted metal injection molding
  18. Book Review / Buchbesprechungen
  19. Nanowerkstoffe für Einsteiger
  20. Personal
  21. Conferences
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