| Title |
Preparation of Fine Carbide Powders by Vapor Phase Reaction (2) ( Synthesis of Tungsten Carbide Powders by WCl6 - C3H8 - H2 System ) |
| Authors |
김수식(Soo Sik Kim); 김한삼(han Sam Kim) |
| Abstract |
To obtain fundamental informations for fine tungsten carbide powders, the preparation of fine tungsten carbide by varpor phase reaction of WCl_6-C₃H_8-H₂ system has been carried out in the temperature range of 700-1200℃ The effects of reaction conditions on particle size and morphology of tungsten carbide powders have been investigated by utilizing X-ray diffraction, SEM and TEM techniques. The synthesis temperature of only WC powders is above 1100℃ in the condition of the flow rate of argon and H₂ gas 200㎖/min respectively and C₃H_8 gas 30㎖/min. The particle size of the reaction products obtained at 1200℃ is about 0.02 ㎛ and the shape of WC is spherical. The particle size and the crystallite size decreases gradually with increasing reaction temperature. |