粉体砂磨工艺对SiO2-ZrO2-MgO-CaO助烧95Al2O3陶瓷微观结构与性能的影响  

Effect of Powder Sanding Process on Microstructure and Properties of 95AlO Ceramics Sintered with SiO-ZrO-MgO-CaO Aid

作　　者：方豪杰 贺亦文 张晓云 曾超 曾雄 林华泰 郭伟明[2] 吴利翔[2] 刘秋宇 FANG Haojie;HE Yiwen;ZHANG Xiaoyun;ZENG Chao;ZENG Xiong;LIN Huatay;GUO Weiming;WU Lixiang;LIU Qiuyu(Hunan Meicheng Ceramics Technology Co.,Ltd.,Loudi 417600,China;School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]湖南省美程陶瓷科技有限公司,娄底417600 [2]广东工业大学机电工程学院,广州510006

出　　处：《机械工程材料》2020年第10期57-61,共5页Materials For Mechanical Engineering

基　　金：湖南省科技攻关计划资助项目(2019GK4039)。

摘　　要：采用砂磨工艺对Al2O3粉体进行研磨,研究了粉体的形貌,以及在SiO2-ZrO2-MgO-CaO烧结助剂作用下烧结粉体得到95Al2O3陶瓷的物相组成、微观结构和力学性能,并与行星球磨工艺下的进行对比。结果表明:砂磨后Al2O3粉体的平均粒径仅为0.2μm,砂磨对粉体具有明显的细化作用,而行星球磨后的中位粒径为2.4μm,与未研磨粉体的相近;烧结砂磨粉体得到陶瓷的物相为Al2O3、Al0.52Zr0.48O1.74、m-ZrO2,而烧结行星球磨粉体与未研磨粉体的物相为Al2O3与微量m-ZrO2;烧结砂磨粉体得到陶瓷表面的Al2O3晶粒未异常长大,ZrO2相钉扎在Al2O3晶界,而烧结行星球磨粉体与未研磨粉体的Al2O3晶粒均存在异常长大现象;烧结砂磨粉体得到陶瓷的断裂韧度为(4.6±0.6)MPa·m1/2,高于烧结未研磨和行星球磨粉体的。The morphology of the Al2O3 powder milled by sanding process and the composition,microstructure,and mechanical properties of 95Al2O3 ceramics prepared by sintering the powder with SiO2-ZrO2-MgO-CaO sintering aid were studied,and compared with those milled by planetary ball.The results show that the average particle size of Al2O3 powder after sanding was 0.2μm,indicating that sanding had a significant refining effect on powder;the median particle size after planetary ball milling was 2.4μm,which was similar to that of powder without milling.The phases of the ceramics prepared by sintering powder with sanding were Al2O3,Al0.52Zr0.48O1.74 and m-ZrO2,and those prepared by sintering powder with planetary ball milling and without milling were Al2O3 and a small amount of m-ZrO2.The Al2O3 grains on surface of the ceramics prepared by sintering powder with sanding did not grow abnormally,and the ZrO2 phase was pinned at Al2O3 grain boundaries;the Al2O3 grains prepared by sintering powder with planetary ball milling and without milling grew abnormally.The fracture toughness of ceramics prepared by sintering powder with sanding was(4.6±0.6)MPa·m1/2,and was higher than those prepared by sintering powder with planetary ball milling and without milling.

关 键 词：95Al2O3陶瓷 砂磨 微观结构 断裂韧性 

分 类 号：TB321[一般工业技术—材料科学与工程]