| Title |
Preparation of ( W . Ti ) C Complex Carbide by SHS Process ( self - propagation High temperature Synthesis ) |
| Authors |
고석권(Seog Gueon Ko); 이종현(Jong Hyeon Lee); 원창환(Chang Whan Won); 최덕순(Duk Soon Choi) |
| Abstract |
The experimental results for the fabrication of(W·Ti)C powder by self-combustion reaction are summerized as follows : 1) The reaction parameter to influence greatly in synthesis of (W·Ti)C powder is the mole ratio of each elements. Excess carbon must be added to control the final composition because of the carbon deficiency during the reaction. Experimental results show that the optimum mole ratio of W, Ti and C is 0.2, 0.7, and 1.2 respectively. Self-combustion is difficult with increasing the carbon mole ratio compared with the stoichiometry and the steady state combustion is not occurred. 2) In case that the mole ratio of Ti to W is large, combustion is impossible due to decreasing of adiabatic reaction temperature. Adiabatic reaction temperature of(W·Ti)C is about 2900 to 3000°K and the steady state combustion at this temperature is performed. 3) The particle size and the compression density of W powder are constant regradless of the reaction products. However, the reaction rate decreases with increasing the particle size. The reaction rate increases with the compression density of W powder and is constant above that of 2.77 g/㎤. |