Microstructure and properties of HfC and TaC-based ceramics obtained by ultrafine powder
Microstructure and properties of HfC and TaC-based ceramics obtained by ultrafine powder
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DOI：
10.1016/j.jeurceramsoc.2010.10.036
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发表时间：
2011-04-01
影响因子：
5.7
通讯作者：
Zhang, G. J.
中科院分区：
文献类型：
--
作者：
Silvestroni, L.;Bellosi, A.;Zhang, G. J.
从合成的超细粉末开始，在1900 ℃下热压HfC和TaC基陶瓷5-20分钟。添加5体积%的MoSi（2）改善了致密化，其从纯基体的约85-90%增加到复合材料的95%。在室温和1500 ℃下在保护气氛下测量弯曲强度。这项工作的附加值在于利用廉价的合成粉末来实现复合材料，其性能与使用更昂贵的商业粉末获得的性能相当。起始粉末的纳米尺寸的效果显示出具有改善致密化行为和机械性能的潜力，但是有必要进一步优化合成条件以避免形成未反应粉末的团聚体。(C)2010爱思唯尔有限公司版权所有。
HfC and TaC-based ceramics were hot pressed at 1900 degrees C for 5-20 min starting from synthesized ultrafine powders. The addition of 5 vol.% of MoSi(2) improved the densification, which increased from around 85-90% for the pure matrices to 95% for the composites. The flexural strength was measured at room temperature and at 1500 degrees C under protective atmosphere. The added value of this work consists in the utilization of cheap synthesized powders for the realization of the composites with properties comparable to those obtained using more expensive commercial powders. The effect of the nanometric size of the starting powder showed to have the potential to improve the densification behavior and the mechanical properties, however it is necessary a further optimization of the synthesis condition in order to avoid the formation of agglomerates of unreacted powder. (C) 2010 Elsevier Ltd. All rights reserved.