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金属陶瓷中(Ti,Me)(C,N)/Ni界面价电子结构
Valence Electron Structure of Interface between(Ti,Me)(C,N) and Ni in Cermets
【摘要】 运用固体与分子经验电子理论(empirical electron theory,EET理论)计算了Ti(C,N)基多元陶瓷相和金属Ni(面心立方,fcc)的价电子结构以及Ni/陶瓷相界面价电子结构。结果表明:(Ti,Me)(C,N)/Ni界面电子密度差(Δρ)均大于10%,界面电子密度(ρ)不连续。碳化物对界面结合因子(ρ,Δρ,σ)影响大小依次是Mo2C>NbC>WC>TaC;其中添加Mo2C和WC可以有效改善Ni对陶瓷相的结合性能(润湿性),从而提高金属陶瓷的强韧性。
【Abstract】 The valence electron structures of Ti(C,N)-based multiple ceramic phases,metallic Ni(fcc) and the interface between(Ti,Me)(C,N) and Ni were calculated by using empirical electron theory(EET).The results reveals that there is a big electron density difference(△ρ>10%) between(Ti,Me)(C,N) and Ni,furthermore,the distribution of the interface electron density is discontinuous.The impacts of various carbides on interface bonding factors(ρ,△ρ) are in the order of Mo2C>NbC>WC>TaC.The addition of Mo2C or WC can greatly improve the binding property(wettability) of Ni to ceramic phases,thereby can promote the strength and toughness of Ti(C,N)-Ni cermets.
【Key words】 empirical electron theory; interface valence electron structure; carbide; metallic Ni;
- 【文献出处】 矿冶工程 ,Mining and Metallurgical Engineering , 编辑部邮箱 ,2005年06期
- 【分类号】TG111.1
- 【被引频次】8
- 【下载频次】253