低放热体系Al/Mg_2Si复合材料的活化燃烧合成  

Activatory combustion-synthesis of Al/Mg_2Si composite of weak-exothermic system

作　　者：周琦[1,2] 常春蕾[1] 赵红顺[1] 张俊喜[1] 马勤[1,2] 

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2008年第5期10-13,共4页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(0803RJZA013)

摘　　要：通过添加韧性相Al来改善金属间化合物Mg2Si的脆性,采用机械活化与热学活化相结合,制备低放热反应体系的Al/Mg2Si复合材料.通过SEM、XRD观察分析产物的物相组成与形貌特征.结果表明,产物主要物相为Mg2Si及部分Al、Si和MgO2等.随着球磨时间延长、预热温度升高,燃烧合成反应易于进行;随着Al质量分数的增加,燃烧合成反应的预热温度下降.Al/Mg2Si composite material of weak-exothermic system was prepared by means of combined mechanical and thermal activation as well as addition of toughness phase-Al for improving the brittleness of intermetallic compound Mg2Si. The phase-composition and morphological characteristics of the resultant were observed and analyzed with SEM and XRD. The result showed that major phase of the resultant was Mg2 Si with minor ones of Al, Si, and MgO2. The combustion-synthesis was easy to take place when the time of ball-milling was prolonged and the preheating temperature increased. The preheating temperature of combustion-synthesis reaction decreased with Al-content increasing.

关 键 词：燃烧合成 机械活化 低放热系 

分 类 号：TG146.2[一般工业技术—材料科学与工程]