Mo对Al_2O_3-TiN-TiC陶瓷材料微观组织及性能的影响  

The Effects of Mo Addtion on the Microstructures and Mechanical Properties of Al_2O_3-TiN-TiC Ceramic Materials

作　　者：费玉环[1] 黄传真[1] 刘含莲[1] 邹斌[1] 

机构地区：[1]山东大学机械工程学院先进射流工程研究中心,济南250061

出　　处：《组合机床与自动化加工技术》2012年第8期23-27,共5页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家自然科学基金(50975161;51005136);济南市高校自主创新计划(200906013)

摘　　要：采用热压烧结法制备了Al2O3-TiN-TiC复合陶瓷材料,研究了不同Mo含量对于烧结后复合陶瓷材料微观组织和力学性能的影响。结果表明:适量的Mo能促进TiN的溶解,改善Al2O3-TiN-TiC陶瓷材料的微观组织,提高力学性能。随着Mo含量的增多,硬质相的棱角逐渐变钝,沿晶断裂方式增多,穿晶断裂减少。在复合材料中Mo添加量为3vol%时,综合力学性能最佳,抗弯强度、断裂韧度和维氏硬度分别为877MPa、6.32MPa.m1/2和19.87GPa。在复合材料中Mo添加量为1vol%时,在材料中发现大量解理断裂,对断裂韧度的提高有明显作用。AI203-TiN-TiC ceramic materials with different Mo content were fabricated by hot-pressing technique. The effects of the content of Mo on the microstructures and the mechanical properties of sintered composites were investigated. The results show that the proper addition of Mo can improve the topography of the microstructure and enhance the mechanical properties. With the increase of Mo addition, the shape of hard phase gets blunt, the intergranular fracture becomes the major fracture way. The best mechanical properties achieve 877MPa、6.32MPa · m1/2 and 19.87GPa when the additon of Mo is 3vo1%. Cleavage fracture which could enhance the fracture toughness is found when the additon of Mo is 3vo1%.

关 键 词：Mo含量 微观组织 力学性能 Al2O3-TiN-TiC陶瓷 

分 类 号：TH16[机械工程—机械制造及自动化] TG65[金属学及工艺—金属切削加工及机床]