摘要
提出通过基体合金化改善Al2O3(sf)/Al界面浸润性的想法,添加的合金元素M须满足以下两个条件:(1)元素M的表面能必须小于Al的,即ΓM<ΓAl;(2)元素M的氧化物生成Gibbs自由能要小于氧化铝的。试验证明,元素镁是一种良好的润湿增强剂,稀土元素镧可在镁的基础上进一步增强润湿,但未发现其在界面上生成任何反应产物。
To improve the wettability and adherence of Al_2O_(3(sf))/Al composites,the approach by matrix alloying is proposed.The alloying element has to meet both of the following requierements:1.It should be able to reduce the surface tension of molten aluminum,namely,Γ_M<Γ_(Al);2.The oxide of M has more negative standard free energy than Al_2O_3,namely ΔG(()M_xO_y())<ΔG(()Al_2O_3).The proposal has been proved experimentally with the result that Mg has enhanced the wettability,La promoted wettability further,but the compound of RE is not found at the surface.
出处
《上海有色金属》
CAS
2004年第2期49-52,共4页
Shanghai Nonferrous Metals
