TaB₂ powders synthesis by reduction of Ta₂O₅ with B₄C

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• 作者：Yang You^a ; Da-Wang Tan^b ; Wei-Ming Guo^b ; ^{guo1238@126.com" class="auth_mail" title="E-mail the corresponding author} ; Shang-Hua Wu^b ; Hua-Tay Lin^b ; Zhuo Luo^c
• 关键词：TaB2 ; Powders synthesis ; Ta3B4 ; Reaction processes ; Microstructure
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：897-900
• 全文大小：762 K

文摘

This work reported the synthesis of submicrometric TaB₂ powders by reduction of Ta₂O₅ using B₄C in vacuum. The starting mixture with a molar ratio of B₄C/Ta₂O₅=1.57 completely converted to a mixture of TaB₂ and B₂O₃ at 1100 °C, whereas that converted to a mixture of TaB₂, Ta₃B₄ and minor TaB at 1550 °C due to the boron loss resulting from the formation of gaseous boron-rich oxides. Microstructure observation showed the TaB₂ and Ta₃B₄ particles had small equiaxed and large plate-like shapes, respectively. Excess B₄C should be added to compensate for the boron loss. Phase-pure TaB₂ powders with equiaxed shape were synthesized at 1550 °C with a molar ratio of B₄C/Ta₂O₅=1.90. The particle size and oxygen content of TaB₂ powders were ~0.7 µm and ~0.80 wt%, respectively.