ZrO2 removing reactions of Groups IV–VI transition metal carbides in ZrB2 based composites
ZrO2 removing reactions of Groups IV–VI transition metal carbides in ZrB2 based composites
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DOI：
10.1016/j.jeurceramsoc.2010.10.011
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发表时间：
2011-03
影响因子：
5.7
通讯作者：
J. Zou;Guo‐Jun Zhang;Shikuan Sun;Hai‐Tao Liu;Y. Kan;Ji‐Xuan Liu;Chang-Ming Xu
中科院分区：
文献类型：
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作者：
J. Zou;Guo‐Jun Zhang;Shikuan Sun;Hai‐Tao Liu;Y. Kan;Ji‐Xuan Liu;Chang-Ming Xu
本文研究了ZrB 2基超高温陶瓷中Ⅳ-Ⅵ族过渡金属碳化物（M=Hf、Nb、Ta、W、Ti和V）的ZrO 2去除反应。在此过程中，观察到不同的MC的不同作用。通过热力学分析和实验验证，不同MC的氧化物去除能力顺序为WC>VC>NbC>TaC>HfC>TiC。本研究的重点是建立过渡金属碳化物与ZrO_2的反应性图谱，以选择合适的添加剂来致密化ZrB_2-SiC复合材料，利用合适的反应和控制合适的烧结气氛，最终在2000-2200°C的温度下无压烧结得到高密度的ZrB_2-SiC陶瓷。
In this paper, ZrO2removing reactions of Groups IV–VI transition metal carbides (MCs, M=Hf, Nb, Ta, W, Ti and V) in ZrB2based ultra-high temperature ceramics (UHTCs) are investigated. Distinct roles of various MCs were observed during this process. According to thermodynamic analysis and experiment verifications, the sequence for oxide removing ability of different MCs is WC>VC>NbC>TaC>HfC>TiC. The importance of this study concerns the establishment of a map of reactivity of the transition metal carbides against ZrO2, in order to choose the proper additive for the densification of ZrB2-composites.Utilizing right reactions and controlling proper sintering atmospheres, high density ZrB2–SiC ceramic could be eventually obtained by pressureless sintering at temperatures (around 2000–2200°C).