Al_2O_3/AlTiC/ZrO_2/透辉石陶瓷材料的力学性能及微观结构  

Mechanical properties and microstructures of Al_2O_3/AlTiC/ZrO_2/diopside ceramic composite

作　　者：刘长霞[1] 张建华[1] 张希华[2] 孙军龙[1] 

机构地区：[1]山东大学机械工程学院,济南250061 [2]山东大学材料科学与工程学院,济南250061

出　　处：《粉末冶金技术》2007年第1期17-20,23,共5页Powder Metallurgy Technology

基　　金：教育部科学技术研究重点项目(03101);山东省杰出中青年科学家奖励基金(03BS103)

摘　　要：将金属Al、Al3Ti和TiC以AlTiC中间合金的形式以及ZrO2颗粒共同引入Al2O3基体材料中,热压制备了Al2O3/TiC/ZrO2/AlN复合材料。在此基础上,添加(体积分数)1%透辉石作为烧结助剂,以实现复合材料的液相烧结并促进其致密化程度。复合材料在烧结过程中有新相AlN生成;同时Al、TiC以及Al3Ti释放的Ti原子发生原子重组生成Al2Ti4C。对热压后材料的硬度、断裂韧度和抗弯强度进行了测试和分析;探讨了透辉石对材料致密化程度及力学性能的影响效果;研究了复合材料断面断裂方式的变化对其力学性能的影响;并对AlTiC中间合金的细化特性进行了分析。Al, Al3Ti and TiC in the form of AlTiC master alloys and ZrO2 particles were incorporated into alumina matrix ceramic materials. Composite of Al2O3/TiC/ZrO2/AlN were fabricated by hot-pressing process, during sintering new phase of AlN was produced by chemical reactions between Al and N2 （the protective atmosphere） . Some Al2Ti4C were brought into existence as the chemical reactions among Al, TiC and Ti produced by the decomposition of Al3Ti. The hardness, fracture toughness and bending strength of the composites were tested. Meanwhile, the influences of 1vol% addition of diopside, on densification rate and mechanical properties of alumina matrix ceramic materials were analyzed. The effect of fracture mechanism on mechanical properties of the composites and refining performances of AlTiC master alloys were investigated.

关 键 词：氧化铝 ALTIC中间合金 复合陶瓷 细化特性 

分 类 号：TQ174.758[化学工程—陶瓷工业]