The degradation of infiltration pressure to porous preform is grate watched for the preparation of metal matrix composites (MMC), because we can use the conventional casting process such as gravity casting, sand casting and die casting for preparation of MMC. As Gravity casting usually performs at low pressure under IMPa, infiltration of molten alloy to preform under 0.2-0.8MPa are expected. There are two main problems for the degradation of infiltration pressure, which is low wettability between preform and molten alloy, and the generation of pores. In this study, the preform was made from FeCrSi fiber, which has good wettability for molten aluminum alloy, and the flow control of molten alloy in preform was attempted by using the simulation based on Darcy's Law. Then, the estimation of the actual infiltration was examined by using gravity-casting process in order to estimate the effect of porosity.
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