| 摘要 |
PURPOSE:To prevent unfavorable chemical reactions at the interface between SiC whisker and high temp. immersed Al and to make a composite material having high strength, excellent heat resistance and chemical stability, by covering whisker surface with an alumina, making premolded body of the coated whisker and then immersing Al alloy containing Mg. CONSTITUTION:The SiC whisker having 0.5mum average diameter and 50mum average length is immersed in an alumina sol to form the alumina covered layer on the surface of the SiC whisker. Said alumina covered SiC whisker is dispersed into an organic solvent and the organic solvent is thereafter subjected to pressure filtration. The resulting SiC whisker is compressed and dried to form the premolded body of the whisker. Said premolded body is set into a mold to preheat to 500 deg.C and the molten metal of the Al alloy is poured into the mold to execute pressure casting to the compound at the pressure ratio of about 1,000kg/cm<2>. The uniform Al alloy composite material having the high strength can be thereby obtd.
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