Microstructure and Properties of Si/Al Composites Prepared by Pressure Seepage Method
Si/Al composites with Si volume fraction of 62.1%to 75.6%were prepared by pressure seepage method,and effects of content and particle size of Si powder in Al matrix and hot-pressing treatment on the microstructure and properties of the composites were investigated.The results indicate that the microstructure of prepared Si/Al compos-ites consists of Si phase and α-Al phase,and the thermal conductivity and thermal expansion coefficient are decreased with the increase of Si volume fraction or reduction of Si particle size,which reach the maximum value of 136 W/(m·K)and the mininum value of 7.75×10-6 K-1,respectively.After hot-pressing at 600℃,the sharp corners of the primary Si are obviously passivated,where the thermal conductivity is increased from 119 W/(m·K)to 125 W/(m·K),and the coefficient of thermal expansion is increased from 8.28×10-6 K-1 to 8.73×10-6 K-1.
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