WETTABILITY OF ( Ti| Me) ( C, N) / Ni SYSTEM AND VALENCE ELECTRONSTRUCTURES OF MULTIPLE CERAMIC PHASES
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摘要: 运用座滴法研究了( Ti , Me) (C , N) / Ni 体系的润湿性;运用经验电子理论( EET 理论) 计算了多元陶瓷相的价电子结构(VES) , 建立了陶瓷相化学成分与价电子结构的关系, 并建立了价电子结构与接触角的回归关系式。结果表明, 提高温度、延长保温时间均使体系接触角减小; 碳化物的添加使体系接触角进一步减小,碳化物改善润湿性能力的大小依次为: Mo2C > TaC > WC > VC > NbC。不同碳化物的添加均能导致最强键上共价电子数nA 增加, 其中添加VC 的影响最为明显, 依次为VC > Mo2C > NbC > WC > TaC。
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关键词:
- ( Ti , Me) (C , N) / Ni 体系 /
- 润湿性 /
- 接触角 /
- 价电子结构
Abstract: The wettability of a ( Ti , Me) (C , N) / Ni system was studied by using the sessile drop method. Thevalence elect ron st ructure (VES) of ceramic multiphase in cermets was calculated by using EET theory and relationship s among chemical compositions , valence elect ron st ructure and contact angle were established by means of regression. Wetting test s reveal that the contact angle (θ) reduces continuously with the increase of temperature andholding time and decreases definitely with the increase of carbides content , while the impact order of the carbides onθis Mo2C > TaC > WC > VC > NbC. It can be deduced f rom EET calculations that the covalent elect rons on thest rongest bond in ceramic phases ( nA ) increase with the content of carbides , and the impact order is VC > Mo2C >NbC > WC > TaC. -
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