作　　者： ; ; ; ; ;

机构地区： 山东大学机械工程学院

出　　处： 《山东大学学报（工学版）》 2008年第3期69-72,共4页

摘　　要： 用热压法制备了纳米TiC增韧补强的Si3N4基复合陶瓷材料,研究了不同TiC含量对复合陶瓷材料力学性能与微观结构的影响.结果表明:纳米TiC颗粒的添加对复合材料的力学性能的提高是有利的,当纳米TiC的质量分数为15%时,复合材料具备较优的力学性能,其抗弯强度、断裂韧性、HV硬度分别达到895 MPa,8.03 MPa.m1/2,15.06 GPa;不同尺寸的SiN晶粒形成双峰结构,有利于复合材料性能的提高;其断裂机制为沿晶断裂和穿晶断裂的混合类型. HP sintering technology was adopted to prepare Si3N4 composite ceramics. The effects of TiC nano-sized particle on the microstructure and the properties of composite ceramics were investigated. The results show that the composite ceramics possess optimum mechanical properties with a flexural strength of 895 MPa, tincture toughness of 8.03 MPa.m^1/2 and hardness of 15.06 GPa when the TiC content is 15wt%. It was found that the microstructure with a distinct bimedal size distribution of grain diameters is beneficial to the properties, The fracture morphology is the mixed style including inter-granular fracture and trans-granular fracture.

关 键 词： 复合陶瓷材料 微观结构 力学性能 断裂机制

领　　域： [一般工业技术]