The SiC/A1 composites were prepared by the lost foam casting

and distribution of the abrasive grains in fracture and bonding of the carcass and SiC abrasive grains in the foamed composite pattern were discussed with the different content and particle size of SiC before and after the filling.With the smaller SiC particle size and the more SiC particle content

the liquid aluminum cannot completely replace the foam in composite pattern when the composites are poured at the same particle content.So the SiC particles are easily flak off the composites and wear layer thickness is reduced.However

with the increase of SiC particle size and the weight of the particles

the moving distance of SiC particles is reduced

which is conducive to the retention and to increasing wear layer thickness.Increasing in the concentration of SiC particles and the thickness of wear layer

the retention effect of abrasive particles in aluminum liquid is obviously improved.The observation of the fracture morphology reveals that the matrix has high bonding force with SiC particles and it will not be changed with the increase of SiC particle content.