To produce the composite material having sufficient strength at ordinary temp. and minimal in the reduction of strength even at high temp. by previously forming aluminum nitride layer on the surface of alumina fiber at the time of making aluminum penetrate into a preform constituted of alumina fibers.
The metal-ceramics composite material is produced by making aluminum or aluminum alloy, as base material, penetrate into a preform constituted of alumina fibers or grains as reinforcement. At this time, the alumina fibers or grains are mixed with carbon powder, and the resultant mixture is heated in a nitrogen atmosphere at ≥1,700°C, by which aluminum nitride layer is formed on the surface of the alumina fibers or grains previously. By this method, wettability between the alumina fibers or grains and the aluminum or aluminum alloy can be improved, and the metal-ceramics composite material, having strength at ordinary temp. and high temp. strength higher than those of the conventional one, can be obtained.
MATSUMARU YOKO
YOSHIDA HIDETO
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