摘要
利用TiH2,Si和B4C之间的化学反应制备TiB2-SiC复相陶瓷,研究了反应时物相生成机理及添加Ni对材料力学性能的影响.采用SEM观察复相陶瓷的显微结构及裂纹扩展过程,用XRD法测定了复相陶瓷内的残余应力,探讨了复相陶瓷的增韧机理同时,残余应力测试结果表明,精磨会给材料表面带来一定的机械加工应力,但随方向而异。
A new process of chemical reaction Si+2TiH2+B4C→ 2TiB2+SiC+2H2↑ for preparing TiB2-SiC composites has been proposed. The TiB2-SiC composites were fabricated by reactive hot pressing at 2000℃ under the pressure of 30MPa for 60min in Ar atmosphere. The effects of the addition amounts of Ni on the mechanical properties, the residual stresses and the toughening mechanisms of the composites were discussed.
出处
《材料研究学报》
EI
CAS
CSCD
1996年第1期45-50,共6页
Chinese Journal of Materials Research
基金
国家自然科学基金
关键词
复相陶瓷
残余应力
TiG2-SiC
烧结
物相反应
reactive synthesis ceramic composite toughening mechanism thermal residual stress TiB_2-SiC