Synthesis of New W(C,N) Powder by Heating W+C and WO_3+C Mixed Powders in NH_3+H_2 and CH_4+NH_3 Mixed Gases
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概要
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New tungsten carbonitride W(C, N)powder with 11-20 at% nitrogen had already been found by us to be synthesized by heating W+C mixed powder in N<SUB>2</SUB> gas of high pressure(10-160 MPa)at 1523-1773 K. In this work, the synthesis of W(C, N)powder was tried by heating W+C and WO<SUB>3</SUB>+C mixed powders in NH<SUB>3</SUB>+H<SUB>2</SUB> mixed gas of normal pressure(method I)and by heating W powder in CH<SUB>4</SUB>+NH<SUB>3</SUB> mixed gas of normal pressure(method II), mainly at 1573 K for 3.6 ks. This try was based on the general concepts that the reactivities or activities of nitrogen and carbon atoms formed by the dissociation of NH<SUB>3</SUB> and CH<SUB>4</SUB> respectively are enormously high, compared with those of N<SUB>2</SUB> and solid carbon, respectively. It was found that the products obtained by methods I and II were W(C, N) with nitrogen contents of 3 and 5 at%, respectively. The functions of NH<SUB>3</SUB> and CH<SUB>4</SUB> in the carbonitridation of W powder were also experimentally investigated in comparison with those of N<SUB>2</SUB> and solid carbon, respectively.
- 社団法人 粉体粉末冶金協会の論文
- 1999-11-15
著者
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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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