(Ti,Me)(C,N)/Ni的润湿性及其价电子结构

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

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。

The wettahility of a （Ti, Me）（C, N）/Ni system was studied by using the sessile drop method. The valence electron structure （VES） of ceramic muhiphase in cermets was calculated by using EET theory and relationships among chemical compositions, valence electron structure and contact angle were established by means of regression. Wetting tests reveal that the contact angle （0） reduces continuously with the increase of temperature and holding time and decreases definitely with the increase of carbides content, while the impact order of the carbides on θ is Mo2C〉TaC〉WC〉VC〉NhC. It can be deduced from EET calculations that the covalent electrons on thestrongest bond in ceramic phases （nA） increase with the content of carbides, and the impact order is VC〉Mo2C〉NbC〉 WC〉TaC.