溶湯噴霧法による球状粉の試作研究

概要

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The recent powder metallurgy has a strong demand for spherical less-oxidized alloy powders in the market of sintered filters, electromagnetic clutch, plasma spray etc.Accordingly, some technologies to produce the said alloy powders in the use of the water-atomization equipment have been developed.First, there was made spherodization of the particle shape of stainless steel powders by controlling Si and B content, superheart temperature of melt and jetting pressure for water-atomization to some extent.Secondly, further spherodization of particle shape of powders could successfully be obtained by special physical treatment after atomization, with lowering the oxygen amount of powders. As the result, the sintering-rate of powder was appreciably promoted under the probable influence of induced strain on the surface of particle.There was finally established the industrial technique for providing the spherical alloy powders by means of gas-atomization with rapid quench in water, allowing the coverage of more powder applications.
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