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

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.