中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 34 No. 3 March 2024 |
（1. School of Physics and Materials Science, Nanchang University, Nanchang 330031, China;
2. International Institute of Materials Innovation, Nanchang University, Nanchang 330031, China）
Abstract:To simplify the preparation process and prepare ultrafine WC powder, a certain amount of As element was added to the ammonium paratungstate precursor. The mechanism of As in the preparation process of ultrafine WC powder by nitridation-carbonization method was systematically discussed. The results show that when the carbonization temperature was 1400 °C, the nitridation temperature increased from 500 to 600 °C, and the As content increased from 0 to 0.3 wt.%, the average particle size of the prepared WC powder decreased from 2.23 to 0.22 μm, and the particle uniformity was significantly improved. The As element in the nitrided product was in the form of W2O3(AsO4)2, which was easily enriched or distributed between the two phases on the surface of the nitrided products (NH4)0.42WO3 and WN, hindering the growth of WC grains during the carbonization process. Consequently, ultrafine WC powder was prepared.
Key words: arsenic; ultrafine WC powder; uniformity; refining mechanism; nitridation; carbonization
