SiCp颗粒增强铝基复合材料工艺与组织研究

对无压渗透制备碳化硅颗粒增强铝基复合材料工艺进行了探索，并利用光学显微镜、扫描电镜对其组织进行了观察，用ｘ射线衍射仪对复合材料组成相进行了分析。结果表明：采用无压渗透技术，可以制备碳化硅颗粒增强铝基复合材料；熔融的基体合金对碳化硅颗粒预制体渗透完全；其过程存在Ａｌ与ＳｉＣ的化学反应，产物为Ｓｉ和碳化铝（Ａ１４Ｃ３），其中Ｓｉ进入基体中，Ａｌ４Ｃ３能与大气中水汽发生化学反应，结果使碳化硅铝基复合材料存放一定时间后发生龟裂和粉化。为限制Ａｌ与Ｓｉ反应，可向基体中加入适量的Ｓｉ元素，可使电裂与粉化问题得到解决。

Research on SiCp Particle Reinforced Al base Composites

An approach to a pressure-free metal infiltration technology for fabricating SiCp reinforced aluminium base composites is made. The microstructures of the composites are observed by using an optical and SEM and the phases are analyzed by using X ray diffractometer.The results indicate that with the pressure free metal infiltration technology a SiCp particles reinforced aluminium base composite can be fabricated,a full infiltration of SiCp particles into a molt matrix can be achieved, during which there is a chemical reaction between Al and SiC producing Si and Al4C3. Si can enter into the matrix and Al4C3 can react with aqueous vapour,resulting in cracking and powdering in the composite which is stored for a time.To restrict the reaction between Al and Si ,appropriate amount of Si can be added into the matrix,and the problems of cracking and powdering can be solved.