冷間圧縮-焼結法によるMoSi2を主体とする電気抵抗発熱体の製造

概要

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To get the sound heat element chiefly composed of MoSi 2, at first we tested tap density, compressibility and compactibility of mixed powder itself of MoSi 2, SiO2, and Al2O3. As the result of above powder tests, we could clear the compacting condition. Furthermore, we measured electrical and mechanical properties of the cold-pressed specimens to get the best sintering condition in various gases. Results were as follows : (1) The tap density was 1.89g/cm3. (2) The compactibility was proved successful without lubricant, its value being 3.2kg/mm2. (3) The optimum pressure of cold-pressing was 20kg/mm2. (4) Shrinkage percent was about 35-39%, with the sintering condition, at 1600-1650°C, in vacuum, argon gas and H2 gas atmosphere. (5) In vacuum, Ar gas and H2 gas atmosphere, the optimum sintering temperature was 1600-1650°C. The density of the specimens sintered was 4.1-4.3g/cm3. (6) Electrical resistance values of specimens sintered at 1600-1650°C in various atmo-spheres were in the range of 2.35-2.96×10-4Ω-cm at room temperature. Its values were higher than that of the specimens prepared with hot pressing. (7) Electrical resistance values at 1400°C were 1.08-1.20×10-3Ω-cm. (8) Modulus of rupture at 800°C was 17.2-18.9kg/mm2.
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