Fabrication of Lower Thermanl Expansional Aluminium Alloys by Spray-Casting Process

초록

Spay-casting process os becoming increasingly attractive as an alternate production route for particulate reinforced metal matrix composites, and the coefficient of thermal expansion(CTE) of the composites can be controlled by altering the level of reinforcement. In this study, performs of Al-Si matrix composites reinforced with SiCp were fabricated by spray-casting process, and the coefficient of thermal expansion(CTE) of the composites were investigated using thermal mechanical analysis(TMA) after hot-extruded It was found that the CTE of the composite with SiCp reduced with increase in volume fraction of SiC particles, and the Al-Si performs without SiCp also exhibited reduced CTE compared to mold-cast specimen. The effect of the grain and Si phase size, and the aspect ratio of Si phase, as well as the volume fraction of the SiCp on the CTE of the Al-Si composite have also been examined.