PRODUCTION OF CONJUGATED BORIDE POWDER IN AS MO2FEB2-BASE

摘要

PURPOSE:To improve heat resistance, high temp. strength, oxidation resistance and corrosion resistance of conjugated boride powder by producing Mo2FeB2 type conjugated boride by bringing the powders of Fe, Mo, B and C to a solid phase reaction, then cooling and pulverizing the obtd. boride. CONSTITUTION:Two or more kinds of powders selected from simple powders of Fe, Mo, and B, borides and alloy powders incorporating two or more elements among above-mentioned powders, Fe, Mo, and B simple powders containing C, borides and alloys thereof, and carbon powder are compounded by the compounding ratio of 7.2-8.8wt.% of B, 64-78wt.% of Mo, and the balance of Fe and inevitable impurities. Then the compounded material is mixed and pulverized into 0.1-50mum mean particle size, heated in a nonoxidative atmosphere at 0.5-100 deg.C/min heating rate to 750-1500 deg.C and thermally treated for one minute to 5 hours at this temp. to bring it to a reduction reaction by C and the solid phase reaction to produce Mo2FeB2-based conjugated boride. This boride is then cooled, pulverized and a Mo2FeB2-based conjugated boride powder that has 0.1-50mum mean particle size and contains =90wt.% Mo2FeB2-based boride, 0.005-1wt.% residual C and 0.001-0.5wt.% residual O is obtd.