Study On Preparation And Properties Of Aluminum Matrix Composites Strengthened By Nano-sic Particles

Aluminium matrix composites strengthened by SiC particles (SiCp/Al composites) have extensive applyment prospect because of their higher specific strength,specific rigidity,favorable thermal conduction,better elevated-temperature, better wear resistance properties, and lower thermal coefficient and so on. Nano-SiCp/Al composites prepared by high energy ball milling and hot pressed sintering possess better microstructure and properties.In the process of high energy ball milling, the content of nano-SiCp,the time of high energy ball milling and the rotational speed have the material effect。Research results show that the content of nano-SiCp is 2%,the time of high energy ball milling is 2h, and the rotational speed is 200r/min are the best parameters。In the process of hot pressed sintering, that the temperature of sintering is 873K, the load is 40MPa, and the time of keeping the temperature and the load is 20min, is the best parameter.If nano-SiCp,s surface is treated previously, it will be good to the microstructure and properties of nano-SiCp/Al composites. The SEM pictures of nano-SiCp/Al composites indicate that nano-SiCp disperses well on the aluminium matrix, and nano-SiCp is embedded in aluminium matrix gr adually.In this paper, it is studyed that the process and parameters of the preparation of nano-SiCp/Al composites by high energy ball milling and hot pressed sintering, and finally it is determinated that the best process and parameters of the preparation of nano-SiCp/Al composites.