Synthesis of New(W,Mo)(C,N) Powder by Heating W-Mo Alloy Powder in CH_4+NH_3 Mixed Gas of Normal-Pressure
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概要
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The authors had already succeeded in synthesizing the powders of new tungsten and molybdenum mono-carbonitrides, i.e., W(C, N) and Mo(C, N), by the following two processes: (1) high-pressure process: heating of W+C and Mo+C mixed powder in N<SUB>2</SUB> gas of 10-150 MPa at 1523-1773 K, and (2) normal-pressure process: heating of W and Mo powder in CH<SUB>4</SUB>+NH<SUB>3</SUB> mixed gas of 0.1 MPa at 1373-1573 K. In this study, the synthesis of (W<SUB>0.3</SUB>Mo<SUB>0.7</SUB>) (C, N) was attempted by the latter normal-pressure process, i.e., by heating W-70at%Mo alloy+C mixed powder in NH<SUB>3</SUB> gas (method I) and by heating the alloy powder in CH<SUB>4</SUB>+NH<SUB>3</SUB> mixed gas (method II). It was found that (W<SUB>0.3</SUB>Mo<SUB>0.7</SUB>) (C, N) with nitrogen contents of 23-21 at% could be synthesized by method II at 1373-1573 K. The maximum nitrogen content was fairly larger than 5 at% of W(C, N) and 17 at% of Mo(C, N) synthesized by method II, and also larger than 16-21 at% of (W<SUB>0.3</SUB>Mo<SUB>0.7</SUB>)(C, N) synthesized by the high-pressure process at 10-150 MPa.
- 社団法人 粉体粉末冶金協会の論文
- 2000-09-15
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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