Synthesis, processing and properties of TaC-TaB2-C ceramics
Synthesis, processing and properties of TaC-TaB2-C ceramics
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DOI：
10.1016/j.jeurceramsoc.2010.01.032
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发表时间：
2010-08-01
影响因子：
5.7
通讯作者：
Opeka, M. M.
中科院分区：
文献类型：
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作者：
Talmy, I. G.;Zaykoski, J. A.;Opeka, M. M.
TaC-TaB2-C 体系中的多相陶瓷是由 TaC 和 B4C 混合物通过在 1700-1900 摄氏度下反应无压烧结制备的。纳米 TaC 的使用和反应产物中活性炭的存在促进了无压致密化。与纯 TaC 相比，TaB2 的存在抑制了 TaC 的克生长并增加了硬度。如果使用粗 TaC 粉末，则组合物不会致密化。相比之下，通过添加以炭黑或石墨形式引入的 2 wt.% 碳，纯纳米 TaC 在 1800 摄氏度下无压烧结。炭黑的引入导致在低至 1500 摄氏度的温度下产生完全致密的 TaC 陶瓷。名义上纯 TaC 陶瓷的晶粒尺寸是碳的强函数。 化学计量。与化学计量 TaC 相比，观察到亚化学计量 TaC 的晶粒尺寸增大。需要进行额外的工作来优化工艺参数并评估 TaC-TaB2-C 系统中陶瓷的性能。由爱思唯尔有限公司出版
Multi-phase ceramics in the TaC-TaB2-C system were prepared from TaC and B4C mixtures by reactive pressureless sintering at 1700-1900 degrees C The pressureless densification was promoted by the use of nano-TaC and by the presence of active carbon in the reaction products. The presence of TaB2 inhibited gram growth of TaC and Increased the hardness compared to pure TaC. If a coarse TaC powder was used, the compositions did not densify In contrast, pure nano-TaC was pressureless sintered at 1800 degrees C by the addition of 2 wt.% carbon introduced as carbon black or graphite The introduction of carbon black resulted in fully dense TaC ceramics at temperatures as low as 1500 degrees C. The grain size of nominally pure TaC ceramics was a strong function of carbon stoichiometry. Enhanced grain size in sub-stoichiometric TaC, compared to stoichiometric TaC, was observed Additional work is necessary to optimize processing parameters and evaluate the properties of ceramics in the TaC-TaB2-C system. Published by Elsevier Ltd.