作　　者： ; ; ; ;

机构地区： 山东大学机械工程学院高效洁净机械制造教育部重点实验室

出　　处： 《硅酸盐学报》 2009年第11期1928-1932,共5页

摘　　要： 以La2O3和Y2O3作为复合烧结助剂,采用热压烧结法制备了Si3N4基复合陶瓷材料。研究了保温时间和烧结助剂含量对复合材料微观结构及力学性能的影响。研究表明:所制备的Si3N4/TiC陶瓷复合材料的微观结构呈现纵横交错、相互嵌套的结构,晶粒尺寸呈现明显的双峰分布特征,单位面积内晶粒数量与烧结助剂含量之间呈线性降低关系。当烧结助剂质量含量为8%时,该复合陶瓷材料具有最优的力学性能,其抗弯强度、断裂韧性和Vickers硬度分别达到943MPa,8.38MPa·m1/2和16.67GPa。 Si3N4 composite ceramics were fabricated by hot pressing sintering with La2O3 and Y2O3 as composite sintering additives.The effects of sintering time and content of composite sintering additives on the microstructure and mechanical properties were studied.Distinct bimodal size distributions with an interlaced and a nested microstructure were observed.The grain number in the unit area decreases linearly with the increase of sintering additive content.The composite ceramics material with the 8% in mass sintering additives possesses optimum mechanical properties,with a flexural strength of 943 MPa,a fracture toughness of 8.38 MPa·m^1/2 and a Vickers hardness of 16.67 GPa.

关 键 词： 氮化硅基复合陶瓷材料 保温时间 烧结助剂 力学性能 微观组织

领　　域： [一般工业技术]