抄録
Sintered iron molds produced by powder metallurgy are useful for casting. They can be made without machining and can be mass-produced and used repeatedly, and also have high gas permeability. In this study, sintered iron molds of about 50% porosity were made by way of trial and casting tests using aluminum and Al-Si alloys were conducted. The sintered iron test pieces were heated up to 700°C and cooled repeatedly in air. Castings produced by using sintered iron molds have considerably sharper corners and do not shrink much in volume during solidification because of their high porosity and low thermal conductivity. The sintered iron molds were oxidized, expanded and embrittled by many pourings. Therefore, they must be made to be oxidation resistant for test application.
