SiC颗粒氧化行为及SiC_p/铝基复合材料界面特征

Oxidation behavior of silicon carbide particales and their interfacial characterization in aluminum matrix composites

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 80 0～ 85 0℃ ,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(MgAl2 O4 ) ,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 。

Interface actions and their products are critical to composite materials. Investigation on SiC p oxidation at elevated temperatures shows that the oxidation increment of SiC p, the dependence of the volume fraction and that of the thickness of SiO 2 layer on temperature are both parabolic. Investigation on the interfacial microstructure of the oxidized SiC p/Al-Mg alloy composites made up by squeeze casting shows that MgAl 2O 4 forms on the surface of SiC p , the quantity and size of MgAl 2O 4 are related to Mg content in the matrix. The interface actions and their products of SiC p/Al-Mg composites can be controlled via SiC p oxidation technical parameters and Mg content.