界面反应和界面产物对SiCp/Al基复合材料的性能具有重要影响.对SiCp的高温氧化行为进行了试验研究.结果表明:SiCp氧化起始温度为800～850℃,其氧化增量和氧化产物SiO2的体积分数及厚度与高温氧化处理的保温时间呈抛物线关系.以氧化处理的SiCp为增强体,含Mg铝合金为基体,通过挤压铸造工艺制备复合材料.利用TEM和FE-TEM对所得的复合材料界面进行观察,结果表明,在SiCp表面形成了一定数量的尖晶石(MgAl2O4),其数量和尺寸与Mg含量有关.由此,通过控制SiCp的氧化处理工艺参数和基体合金成分,可以实现对SiCp/Al基复合材料界面反应及产物的控制.
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