燃烧合成非化学计量碳化钛基金属陶瓷组织与性能

Structure and Properties of Combustion Synthesized Nonstoichiometric Titanium Carbide Base Cermet

以Ti粉和冶金碳黑为原料，C／Ti（原子比）=0．42～0．50，经燃烧合成致密化制备了非化学计量碳化钛基金属陶瓷。物相分析与组织观察表明，金周陶瓷由非化学计量碳化钛和a—Ti相组成。C／Ti增大，金属陶瓷中a－Ti相减少，碳化物晶粒尺寸增大。金属陶瓷的抗弯强度随C／Ti增大而降低，硬度则略有增加。

Nonstoichiometric titaniurn carbide base cermets were prepared by combustion synthesis and densifi-cation from titanium powder and carbon blaek with C/Ti from 0. 42 to 0. 5O. The synthesized cermets were composedof nonstoichiometric t1tanium carbide and a- Ti. As C/Ti (atom ratio) increasing,amount of a - Ti in cermet decrasedand the carbide grain size increased. Increasing of C /Ti made bending strength of cermet decrease and hardness in-crease.[