| 摘要 |
PURPOSE:To manufacture a sintered compact of Ni3Al intermetallic compound excelling in strength at high temp. and having high density by mixing powdered high-purity Al and powdered Ni in a specific ratio, compacting the mixture by a hot pressing process and sintering the green compact in a nonoxidizing atmosphere. CONSTITUTION:The powdered Al of extremely high purity is mixed with the Ni powder in the ratio of Al to Ni of 6-20% to 94-80% and the powder mixture is put into a die made of graphite and is subjected to hot press compacting at 500-700 deg.C for 15min-5hr at a pressure of 50-500kg/cm<2>. Then the resulting green compact is sintered at 1,000-1,300 deg.C in the atmosphere of reducing gas such as H2 or in vacuum, so that the sintered compact of <=2% total porosity having an isotropic crystal structure, consisting of Ni3Al intermetallic compound with <=5mu fine crystals, having high density and excelling in strength at high temp. can be obtained.
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