Research on Steel Based Surface Composites Prepared by Cast Infiltration with Special Composite Particles
Big size of composite particles were prepared by mixing WC with Cr-Fe powder and then pressing.The composites particles were coated on the surface of sand cast mould,and then 45 steel liquid was poured in the cast mould.The thickness,composition of the cast infiltration layer and the cast infiltration mechanism were studied.The results show that,the surface composite layer without defects are obtained using this special composite particles cast infiltration.The coating prepared by this method is thicker than that of by common cast infiltration.The surface composites layer consist of melting layer and brazing layer.The mechanism of the cast infiltration is that high temperature cast steel liquid infiltrates into the gaps between composite particles firstly,and then the gaps between small particles in the composite particles,in the end,the liquid steel solidifies into cast infiltration surface composites layer.