Mo添加量对纳米改性金属陶瓷显微组织的影响  

Effects of Mo Addition on Microstructure of Nano Modified Cermets

作　　者：许育东[1] 刘宁[1] 石敏[1] 韩成良[1] 晁晟[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《矿冶工程》2005年第2期77-80,共4页Mining and Metallurgical Engineering

基　　金：国家自然科学基金项目(No.50072003);安徽省自然科学基金项目(No.03044902);合肥工业大学科研发展基金项目(No.030301F)

摘　　要：研究了Mo添加量对铣削用TiC TiN(nm)WC-Mo2C Ni Co金属陶瓷的组织特征、力学性能和断口形貌的影响。结果表明,金属陶瓷的组织为典型的两相结构特征,其中陶瓷相的芯/壳结构(core/rimstructure)与溶解析出机制有关。少量Mo的加入能提高材料的力学性能。断口SEM分析表明:断裂机理为典型的混合型断裂(穿晶断裂和沿晶断裂),金属相存在着明显撕裂的痕迹。A study was made on the effects of Mo addition on the microstructural characteristics, mechanical properties and fractography of nano-TiN modified cermets which are applied to milling tools. The results show that the cermet exhibits a typical two-phase microstructure (i.e. metallic phase and ceramic phase embedded in the metallic phase). The formation of core/rim structure of the ceramic phase is relevant to the dissolution and deposition mechanism. A small addition of Mo can improve the mechanical properties of the cermets. In addition, a SEM analysis of the fracture surface suggests there is a mixture cracking mechanism (transgranular failure and intergranular failure), and that the metallic phase has apparent tears.

关 键 词：纳米改性 金属陶瓷 组织特征 

分 类 号：TG148[一般工业技术—材料科学与工程]