Sintering Densification of Al-Si Composite by Powder Metallurgy Method for Electronic Packaging

The sintering behaviour of Al-Si composite was studied by using powder metallurgy method.The results show that the relative sintering density decreases from 99.7%to 99.0% when the Si content in the Al-Si composite is from 40%to 60%.The particle size distribution of the powders used in the sintering of Al-Si composite has a slight effect on the sintering density.Furthermore,sintering density increases obviously with the increase of sintering temperature,indicating the optimum sintering temperature is between 550℃and 600℃.With the increase of sintering pressure,the sintering density of Al-50Si composite increases remarkably.Because of the higher pressure,the plastic deformation amount of those spherical powders used in the sintering of Al-Si composite increases so that the gap between the two neighbored powders is shortened,which benefits to the improvement of the sintering density.However,the optimum sintering pressure is 60MPa,and the corresponding relative sintering density of Al-50Si composite is 99.3%.