摘要
本文通过Si3N4、TiC及SiC晶须补强SiC基复相陶瓷的高温等静压烧结，研究了复相陶瓷的显微结构与力学性能，探讨了晶须及第二相颗粒对复相陶瓷的强化与增韧机理．结果表明，不同的补强颗粒及晶须在基体中的作用也不同，Si3N4的引入将在基体与第二相颗粒之间产生径向压应力，阻碍裂纹的扩展，TiC的引入将在基体与第二相颗粒之间产生径向张应力，诱导裂纹的偏转；SiC晶须的引入也将产生阻碍裂纹扩展的机制，从而达到SiC基复相陶瓷强化与增韧，改善其力学性能．
Si3N4, TiC and SiC whisker reinforced SiC matrix composites were Hot Isostatically Pressed,and the microstructure and mechanical properties were studied. The strengthening and tougheningmechanisms are different depending on the incorporation of second phase. Si3N4 in the matrixmay induce the radius compressive force because of the difference of thermal expansion coefficientand elastic modulus. As a result, the crack propagation will be hindered. TiC in the matrix willinduce the radius tension force so that the crack will be deflected. The incorporation of SiCw canproduce the composed strengthening and toughening mechanism such as crack deflection, pull out,so that both of the strength and fracture toughness will be improved.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第1期61-65,共5页
Journal of Inorganic Materials
基金
国家863高技术新材料领域资助!863-715-006-0110
关键词
高温等静压
增韧
碳化硅
复合陶瓷
烧结
hot isostatic pressing, composite, strengthening and toughening, microstructure,mechanical properties
