基体合金化改善氧化铝短纤维与铝液基体间的浸润性研究  

Improvement on the Wettability and Adherence of A1_2O_(3(sf))/Al Composites by Matrix Alloying

作　　者：刘政[1] 涂弢[2] 

机构地区：[1]南方冶金学院教务处,江西赣州341000 [2]南方冶金学院材料与化学工程学院,江西赣州341000

出　　处：《南方冶金学院学报》2004年第2期12-16,共5页Journal of Southern Institute of Metallurgy

摘　　要：本文提出通过基体合金化改善A12O3(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σM<σAl;②元素M的氧化物生成Gibbs自由能要小于氧化铝的.在试验中得以验证,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,此外元素镁还可在界面上形成MgAl2O4反应产物但未发现稀土镧在界面上生成任何反应产物.The wettability and adherence of A1 2 O 3(sf) /Al composites,the approach of matrix alloy-ing is supposed to improve.The alloying element M has to meet both of the following requirements:(1)It can reduce the surface tension of molten aluminium,namely σ M < σ Al ;(2)The oxide of M has more negative standard free energy than Al 2 O 3 ,namely Δ G(M x O y )< Δ G(Al 2 O 3 ).Has the supposition has been proved through experiments,It has been revealed that Mg enhanced wettablity.La pro-moted wetting further in addition to Mg,MgAl 2 O 4 is found at the interface but the compound of RE is not found.

关 键 词：基体合金化 Al2O3(af)/Al复合材料 浸润性 界面 

分 类 号：TG113[金属学及工艺—物理冶金]