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
2 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
3+C mixed powders in NH
3+H
2 mixed gas of normal pressure(method I)and by heating W powder in CH
4+NH
3 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
3 and CH
4 respectively are enormously high, compared with those of N
2 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
3 and CH
4 in the carbonitridation of W powder were also experimentally investigated in comparison with those of N
2 and solid carbon, respectively.
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