自蔓延高温合成非化学计量碳化钛基金属陶瓷

Self- propagating High-Temperature Synthesis of Nonstoichiometric Titanium Carbide Base Cermets

以Ｔｉ粉和冶金碳黑为原料，Ｃ／Ｔｉ（原子比）配料为０．１２～０．５０时，经ＳＨＳ－准热等静压获得了非化学计量碳化钛基金属陶瓷。研究表明：金属陶瓷由非化学计量碳化钛和α－Ｔｉ相组成，随着Ｃ／Ｔｉ增大，金属陶瓷中α－Ｔｉ相比例减少，碳化物晶粒尺寸增大，金属陶瓷的抗弯强度降低而硬度升高。

Nonstoichiornetric titanium carbide base cermets were obtained by SHS-Pseudo HIP from titani-um powder and carbon black with C/Ti from 0.4 2 to 0.50. The results indicate that the cermets were com-posed of nonstoichiometric titanium carbide and α-Ti phases,with C/Ti(atom rate)increasing,amount of α-Ti in the cemets is decreased and the grain size of carbide increased with the bending strength of cermets de-creasing and hardness increasing.