摘要
以氧化铝、莫来石、氧化锆粉体为原料制备了氧化铝-莫来石-氧化锆复合陶瓷。使用密度测试仪、抗折强度测试仪、XRD和SEM等手段对材料的密度、力学性能进行了综合分析,尝试对影响复合陶瓷热震性能的因素及作用机理进行了讨论。研究结果表明:氧化锆弥散分布于基体晶界处,填充了基体颗粒间隙,抑制了基体晶粒长大,阻碍了裂纹扩展,提高了复合陶瓷的致密性和力学性能;ZrO2的t-m转变使基体内部产生一定的压应力区域,诱发显微裂纹的产生,分散主裂纹尖端应力,增强复合陶瓷的强度。
Alumina-mullite-zirconia composite ceramics were prepared from alumina,mullite and zirconia powders.The density and mechanical properties of the materials were comprehensively analyzed by means of density tester,flexural strength tester,XRD and SEM.The factors affecting the thermal shock performance of the composite ceramics and their mechanism were discussed.The results show that zirconia is dispersed at the grain boundary of the matrix,filling the gap of the matrix particles,inhibiting the growth of the matrix grains,hindering the crack propagation,thus improving the compactness and mechanical properties of the composite ceramics.The t-m transformation in ZrO2 causes a certain compressive stress region inside the matrix,inducing the generation of micro-cracks,dispersing the stress at the tip of the main crack,and enhancing the strength of the composite ceramic.
作者
范芳
李生娟
范立坤
FAN Fang;LI Shengjuan;FAN Likun(School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;Key Laboratory of Engineering Materials Application and Evaluation of Shanghai, Shanghai Research Institute of Materials,Shanghai 200437, China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第4期1254-1259,1271,共7页
Bulletin of the Chinese Ceramic Society
关键词
复合陶瓷
抗热震性
ZRO2
弥散增韧
相变增韧
composite ceramic
thermal shock resistance
ZrO2
dispersion toughening
phase transformation toughening
作者简介
范芳(1993-),女,硕士研究生,主要从事工程陶瓷及应用方面的研究,E-mail:18271682926@163.com;通讯作者:范立坤,高工,E-mail:likunfan@126.com。
