| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing spherical powder of metal and metallic compound which is composed of a material such as carbides or nitrides, e.g. silicon carbide, silicon nitride, titanium nitride, etc., used, e.g. for grinding media for high temperature structural members and has required sphere size, composition and structure. SOLUTION: In this method, raw-material powder of metal or metallic compound is heated and melted by high-temperature plasma in a prescribed gaseous atmosphere to undergo spheroidizing, and the resultant spheroidized intermediate spherical powder is heat-treated in a prescribed gaseous atmosphere, by which the spherical powder of metal and metallic compound having required composition and structure can be formed. The raw-material powder is fed via a feed pipe 21 into plasma flame 1 generated by a plasma torch. The raw-material powder is melted by heating and granulated and falls down within a chamber 31. The resultant intermediate spherical particles are further heat-treated, by which the required spherical product can be obtained. |
