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Rare Metals

, Volume 37, Issue 12, pp 1076–1081 | Cite as

Synthesis and densification of zirconium diboride prepared by carbothermal reduction

  • Tao Gui
  • Xing-Ming Wang
  • Lei Yang
  • Yu-Yang Liu
  • Xue Bai
  • Li-Jun Wang
  • Bo Song
Article
  • 45 Downloads

Abstract

Using boron powder as additive, the preparation of zirconium diboride (ZrB2) by carbothermal reduction was investigated. The results show that the carbothermal reduction cannot be completely done until the temperature is more than 1900 °C. The ZrB2 particles prepared without boron (B) additive at 1900 °C for 3 h are rodlike and show a preferential grain growth along [001] direction. B additive changes the heat effect of the raw materials. With B additive, the morphology of ZrB2 particles turns to be regular shape. The average particle size is about 3.6 μm with 2.5 wt% B additives. With more B additive, the shape of particles turns to be round like and the average particle size is decreased to 2.3 μm when 5 wt% B is added. The existence of oxides in grain boundary is a key factor to keep ZrB2 ceramic from deep densification. Using ZrB2 powder prepared with 5 wt% B additives, by controlling carbon content in ZrB2 powder, ZrB2 ceramic with 93% relative density is hot-pressed.

Keywords

Zirconium diboride Carbothermal reduction Grain growth Morphology control Deep densification 

Notes

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51674035).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Division of Metallurgy and Materials for Rare MetalsGeneral Research Institute for Nonferrous MetalsBeijingChina
  2. 2.School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijingChina

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