Preparation of Fe_4N Sintered Compact by Heating Green and Sintered Compacts of Fe Powder in Flowing NH_3+H_2 Mixed Gas
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概要
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Fe green and sintered compacts with relative densities of about 70-90% and with size of mainly 3.2×12×15mm<SUP>3</SUP> were nitrided by heating in NH<SUB>3</SUB>+H<SUB>2</SUB> (1:1) flowing mixed gas at 923 K for 3.6-14.4ks. These two kinds of compacts could be almost completely nitrided to Fe<SUB>4</SUB>N by heating for 14.4ks. The relative densities of nitrided compacts, however, were 76-77% which were lower than those before nitriding. This was because the linear expansion up to about 11-12 % for green compact and 6-7% for sintered compact occured mainly due to crack generation. The saturation magnetizaion of two kinds of nitrided compacts were both about 170-175 emu/g, which was about 80% of the value of Fe solid.
- 社団法人 粉体粉末冶金協会の論文
- 2000-06-15
著者
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HAYASHI Koji
Institute of Industrial Science, The University of Tokyo
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Tanaka Kazuhiko
Institute Of Industrial Science The University Of Tokyo
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Hayashi Koji
Institute Of Industrial Science
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