Preparation of nanocrystalline ultra-high temperature Ta₄ZrC₅ ceramics by joint processes of solvothermal and carbothermal reaction

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• 作者：Jinming Jiang ; Song Wang ; ^{wangs_0731@163.com" class="auth_mail" title="E-mail the corresponding author} ; Wei Li ; Zhaohui Chen
• 关键词：Carbides ; Nanocrystalline materials ; Ternary ceramics ; Solvothermal ; Carbothermal reaction
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：37
• 期：3
• 页码：939-943
• 全文大小：1569 K

文摘

An attractive way to prepare nanocrystalline tantalum zirconium carbide ternary ceramics was proposed and confirmed experimentally. The experimental results showed the Ta₄ZrC₅ powders were successfully fabricated by joint processes of solvothermal and carbothermal reaction. The thermodynamic change process in the Ta₂O₅-ZrO₂-C system was studied. The reactions were substantially completed at relatively lower temperatures (∼1873 K/1 h) and the synthesized powders had a small average crystallite size (∼10 nm). The crystalline structure and the nitrogen sorption isotherms patterns of the product were studied. Besides, a monolithic Ta₄ZrC₅ ceramics was densified without sintering additives by pressureless sintering.