电场强度与恒流时间对闪烧超高纯氧化铝陶瓷微观结构及致密化的影响  

Influence of Electrical Field Intensity and Holding Time on Microstructure and Densification of Flash Sintered Ultra-High Purity Alumina Ceramics

作　　者：杨守磊 朱银晓 代羽锦 韩宁 刘思彤 YANG Shoulei;ZHU Yinxiao;DAI Yujin;HAN Ning;LIU Sitong(School of Materials Science and Engineering,Zhengzhou University of Aeronautics,Zhengzhou 450046,China;School of Chemistry and Chemical Engineering,He′nan Normal University,Xinxiang 453007,China)

机构地区：[1]郑州航空工业管理学院材料学院,河南郑州450046 [2]河南师范大学化学化工学院,河南新乡453007

出　　处：《郑州航空工业管理学院学报》2024年第2期88-94,共7页Journal of Zhengzhou University of Aeronautics

摘　　要：电场强度和恒流时间对陶瓷闪烧行为和微观结构具有重要影响。文章主要探讨电场强度和恒流时间对闪烧超高纯氧化铝微观结构及性能的影响,基于经典致密化理论分析了超高纯氧化铝闪烧工艺的致密化机理。当电场强度从5000V/cm增加到7000V/cm时,闪烧超高纯氧化铝的致密度从91.2%增加到96.4%,硬度从16.87GPa增加到18.65GPa。当恒流时间从1s延长至60s,闪烧超高纯氧化铝的致密度随恒流时间的增加而增加。将恒流时间进一步增加至90s时,闪烧超高纯氧化铝的致密度减小。SEM结果表明恒流时间从1s增加到90s时,闪烧超高纯氧化铝的晶粒尺寸从228nm增加到370nm。Applied electric field and holding time have a great influence on the properties of flash sintered ceramic materials.In this study,the effects of applied electric field and holding time on the microstructure densification of flash sintered ultra-high purity Al2O3 were investigated,and the densification mechanism of ultra-high pure alumina flash sintering process is analyzed based on the classical densification theory.When electric field intensity increased from 5000 to 7000 V/cm,the density of the flash samples increased from 91.2%to 96.4%,the hardness increased from 16.87 to 18.65 GPa.The holding time prolong from 1 to 60 s,the density,hardness of the flash sintered samples increased.The SEM results showed that the grain size of the samples increased from 228 nm to 370 nm when the holding time increased from 1 s to 90 s.

关 键 词：超高纯氧化铝 闪烧 电场强度 恒流时间 

分 类 号：TQ175[化学工程—硅酸盐工业]