Effect of Preheating Profiles on Nitrogen Contents of Mono-carbonitrides Synthesized by Heating W, Mo and W-Mo Powders in CH4+NH3 Mixed Gas of Normal-Pressure (特集 硬質材料)
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概要
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Powders of new mono-carbonitride of W, MO and W-70at%Mo alloy, i.e., W(C, N), Mo(C, N) and (W<SUB>0.3</SUB>Mo<SUB>0.7</SUB>) (C, N) have already been found by the authors to be synthesized by heating the metal and alloy powders at 1373-1573 K in CH<SUB>4</SUB>+NH<SUB>3</SUB> mixed gas of normal-pressure. In this study, the effect of some intermediate phases such as Me<SUB>2</SUB>C and Me<SUB>2</SUB>N (Me: W, Mo and W-70at%Mo), which are generated during the temperature-raising stage, i.e., preheating, on the amount and N content of the mono-carbonitrides, were investigated.<BR>The following were clarified or strongly suggested. (1) W(C, N) is generated from W and W<SUB>2</SUB>N, while not from WC. (2) Mo(C, N) is generated from Mo<SUB>2</SUB>C and Mo<SUB>2</SUB>N, while hardly from Mo. (3) (W<SUB>0.3</SUB>MO<SUB>0.7</SUB>)(C, N) is generated from all of W-70at%Mo, (W<SUB>0.3</SUB>MO<SUB>0.7</SUB>)<SUB>2</SUB>C and (W<SUB>0.3</SUB>MO<SUB>0.7</SUB>)<SUB>2</SUB>N, while not from (W<SUB>0.3</SUB>MO<SUB>0.7</SUB>)C. (4) Me<SUB>2</SUB>N is an appropriate precursor for these three kinds of mono-carbonitrides, compared with Me, Me<SUB>2</SUB>C and MeC. (5) By changing the atmosphere in the temperature-ranging stage from CH<SUB>4</SUB>+NH<SUB>3</SUB> to NH<SUB>3</SUB>, the nitrogen contents (N/metal) of W(C, N) and Mo(C, N) could be increased from 5 and 17 at% (by the conventional profile) to 9 and 22 at%, respectively, while the nitrogen content of (W<SUB>0.3</SUB>MO<SUB>0.7</SUB>) (C, N) could not be increased (23 at%).
- 社団法人 粉体粉末冶金協会の論文
- 2001-07-15
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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