圆柱形微波多模烧结腔烧结Al_2O_3陶瓷的性能  

Microwave sintering of Al_2O_3 ceramic properties research in multi-mode cylindrical microwave sintering resonant cavity

作　　者：李远[1] 汪建华[1] 熊礼威[1] 刘繁[1] 

机构地区：[1]武汉工程大学材料科学与工程学院等离子体化学与新材料重点实验室,湖北武汉430074

出　　处：《武汉工程大学学报》2011年第4期58-61,共4页Journal of Wuhan Institute of Technology

基　　金：湖北省高等学校优秀中青年科技创新团队计划项目(2004419)资助

摘　　要：应用微波加热技术进行高纯Al2O3陶瓷烧结是一种理想的选择.本文使用一种新型的圆柱形微波多模烧结腔体进行了Al2O3陶瓷的烧结研究,该设备可在短时间内达到较高的烧结温度,并能实现坯体的整体烧结.分别对纯Al2O3粉体和Al2O3/MgO混合粉体进行了烧结实验,结果表明,添加MgO作为助烧剂烧结得到的陶瓷试样的相对密度高于纯Al2O3粉体烧结得到的陶瓷试样,在1 700℃下保温40 min,其相对密度可以达到理论密度的97.8%,维氏硬度达22.3 HV/GPa.从SEM图中可观察到试样微观结构良好,晶粒大小均匀,致密化程度高.Microwave sintering is an ideal method to fabricate high property Al2O3 ceramic.In this work,a new type of multi-mode cylindrical microwave sintering resonant cavity,which can obtain higher sinter temperature in a short time and heat the whole sample,was used to sinter Al2O3 ceramic.Pure Al2O3 powder and Al2O3/MgO mixed powder were used respectively.Results showed that addition of MgO powder was benefit for the increase of relative density.While insulation the sample under 1 700 ℃ for 40 min,the relative density can achieve 97.8% of the theory density,the Vickers hardness was 22.3 HV/GPa.It also observed that the crystal structure of microscopic particles in a large,uniform and high degree of density.

关 键 词：微波烧结 多模腔体 AL2O3陶瓷 

分 类 号：TQ174.6[化学工程—陶瓷工业]