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SYNOPSIS Powders of new mono-carbonitride of W, MO and W-70at%Mo alloy, i.e., W(C,N), Mo(C,N) and (W0.3Mo0 .7) (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,+NH3 mixed gas of normal-pressure. In this study, the effect of some intermediate phases such as Me2C and Me2N (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. The following were clarified or strongly suggested. (1) W(C,N) is generated from W and W2N, while not from WC. (2) Mo(C,N) is generated from Mo2C and Mo2N, while hardly from Mo. (3) (W0.3MO0.7)(C,N) is generated from all of W-70at%Mo, (W0.3MO0.7)2C and (W0.3MO0.7)2N, while not from (W0.3MO0.7)C. (4) Me2N is an appropriate precursor for these three kinds of mono-carbonitrides, compared with Me, Me2C and MeC. (5) By changing the atmosphere in the temperature-ranging stage from CH4+NH3 to NH3, 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 (W0.3MO0.7) (C,N) could not be increased (23 at%).

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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.