摘要
通过对SiCp在不同温度下的氧化处理,研究了颗粒氧化对搅拌铸造法制备的SiCp增强铝基复合材料的润湿性和界面结合的影响。结果表明,氧化处理后的颗粒表面形成了具有一定厚度的SiO2氧化层,该氧化层在高温下与铝熔体发生界面反应,从而有效地改善了颗粒与基体间的润湿性,提高了界面结合强度;所制备的复合材料颗粒分布均匀,界面结合良好;界面处有MgAl2O4、Mg2Si生成,没有发现有害界面反应产物Al4C3;复合材料的断裂方式为颗粒的断裂和颗粒从基体中的拔出。
Effects of SiC particle oxidation on the wettability and interfacial bonding of SiCp/Al composites fabricated by stirring casting were analyzed based on oxidizing SiC particle at different temperatures.The results show that SiO2 oxidized layer is formed on the surface of SiC particle by oxidation treatment and reacted with the molten Al at high temperature,which improves the wettability of SiC particle with the molten Al by reducing the interface bonding energy and enhances the interfacial bonding strength.Particle with desirable bonding interface is uniformly distributed in the prepared composites.MgAl2O4,Mg2Si phase can be observed in the interface with the Al4C3 phase free.The fracture mechanism of the composites is characterized by particle crack and pull-out of particle from the matrix.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2010年第11期1062-1065,共4页
Special Casting & Nonferrous Alloys
