中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 11 No. 5 October 2001 |
plasma reactive deposition of tungsten
carbide from tungsten metal powder
（1. Institute of Surface and Coatings Technology,
Central South University,Changsha 410083, P.R.China；
2. Department of Chemical Engineering, University of Sherbrooke,
Sherbrooke, J1K2R1, Canada）
Abstract:Tungsten carbide deposit was made directly from tungsten metal powder through the reaction with methane in radio frequency induction plasma. Effect of major process parameters on the induction plasma reactive deposition of tungsten carbide was studied by optical microscopy, scanning electron microscopy, X-ray diffraction analysis, water displacement method, and microhardness test. The results show that methane flow rate, powder feed rate, particle size, reaction chamber pressure and deposition distance have significant influences on the phase composition, density, and microhardness of the deposit. Extra carbon is necessary to ensure the complete conversion of tungsten metal into the carbide.
Key words: induction plasma; tungsten carbide; deposit; carburization; phase composition
