原位生成陶瓷相增强铝基复合材料物相组成和反应机制的研究  

Phase Compositions and Reaction Mechanism of Alumium Matrix Composites Reinforced by in situ Formation Ceramic Phases

作　　者：孙继兵[1] 李国彬[1] 崔春翔[1] 安雅琴[2] 

机构地区：[1]河北工业大学材料科学与工程学院,天津300132 [2]军事交通学院指挥系,天津300161

出　　处：《稀有金属》2002年第5期364-369,共6页Chinese Journal of Rare Metals

基　　金：河北省自然科学基金资助 (5 940 84)

摘　　要：通过外加颗粒SiO2 采用粉末冶金法成功制备了原位生成陶瓷相增强Al基复合材料 ,定量研究了复合材料的物相组成和反应机制。主要反应方程式为颗粒内Al + 1/ 2Mg +SiO2 =1/ 2MgAl2 O4 +Si和颗粒外 2Mg +Si=Mg2 Si。最终物相由约为 16.5 %～ 18.4%MgAl2 O4 ,3 %～ 5 %Si,11.7%Mg2 Si,及大于 0 .5 2 %MgO ,其余为Al组成 ,约 7%Al参加了反应 ,Mg和SiO2 基本消耗尽。反应是以SiO2 颗粒为核心进行的。这种反应及元素的扩散可以用“逐层反应机制”和“元素微观通道扩散机制”来描述。Al matrix composites reinforced by in situ ceramic phases formed by adding SiO 2 particles were fabricated by powder metallurgy process. The phase compositions and reaction mechanism of the composites were quantitatively studied. It is shown that the phases compositions of the composites are composed of 16.5%～18.4% MgAl 2O 4, 11.7% Mg 2Si, 3%～5%Si, more than 0.52% MgO and the rest Al. During the reaction between SiO 2 and Al Mg about 7 0%Al is participated in, but all Mg and SiO 2, are almost exhausted. The reaction ocour around the SiO 2 particles and could be described by 'layer by layer reaction mechanism' and 'element microscopic channels diffusion mechanism'.

关 键 词：原位铝基复合材料 物相组成 反应机制 扩散机制 

分 类 号：TB332[一般工业技术—材料科学与工程]