摘要
采用粉末冶金法制备了20wt%SiO2/Al-Mg复合材料。研究了SiO2和基体元素Al,Mg反应机制,研究表明:在原SiO2颗粒内,形成MgAl2O4,MgO,Mg2Si和少量Al和Si。MgAl2O4呈不规则形状,而且MgAl2O4往往和Al相邻;MgO和Mg2Si形成片层状共析体;经620℃烧结30min,SiO2被完全反应掉。反应生成物Si多数被排到Al基体中;原Al-Mg基体中主要物相为:Al,Mg2Si和Si,Mg2Si颗粒的尺寸小于0.2μm。原Al-Mg基体中,单质Mg已不存在,Mg反应形成Mg2Si。
The mechanism of interfacial reactions between SiO2 grain and Al-Mg matrix is investigated, and 20wt% SiO2/Al-Mg composites were fabricated by powder metallurgy. As a result, MgAl2O4, MgO, Mg2Si and a little Al and Si were created in the former SiO2 grain. MgAl2O4 comes in an all irregular shape, and MgAl2O4 comes close about Al. The structure of MgO, Mg2Si and Si is slice layer. There is no SiO2 in the former SiO2 grain, which shows that the whole SiO2 has reacted with the Al-Mg matrix by 620°C sintering for 30 min. Si created by the reaction of SiO2 and Al-Mg matrix is pushed into Al-Mg matrix. There are Al, Si and Mg2Si in the matrix. Mg2Si is in a grain shape, and its size is smaller than 0.2 μm. There is no simple Mg in the matrix because the Mg there has been reacted to form Mg2Si.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2003年第2期41-46,共6页
Acta Materiae Compositae Sinica
基金
河北省自然科学基金资助项目
课题编号:594084
