( Ti| Me) ( C, N) / Ni 的润湿性及其价电子结构

许育东; 石敏; 刘宁; 陈名海; 晁晟

( Ti| Me) ( C, N) / Ni 的润湿性及其价电子结构

合肥工业大学材料科学与工程学院, 合肥 230009

基金项目: 国家自然科学基金(50072003); 安徽省自然科学基金(03044902); 合肥工业大学科研发展基金(030301F)

详细信息

通讯作者:
许育东,博士,副教授,研究方向为金属陶瓷材料 E-mail:drxuyudong@126.com

中图分类号: TB333
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出版历程
- 收稿日期: 2004-07-24
- 修回日期: 2005-03-08
- 刊出日期: 2005-08-14

WETTABILITY OF ( Ti| Me) ( C, N) / Ni SYSTEM AND VALENCE ELECTRONSTRUCTURES OF MULTIPLE CERAMIC PHASES

School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China

摘要

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n_A 增加, 其中添加VC 的影响最为明显, 依次为VC > Mo₂C > NbC > WC > TaC。
- ( 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 ( n_A ) increase with the content of carbides , and the impact order is VC > Mo₂C >NbC > WC > TaC.
- ( Ti , Me) (C , N) / Ni system /
- wettability /
- contact angle /
- valence elect ron st ructure