Flash sintering of high-purity alumina at room temperature  

作　　者：Yueji Li Qingguo Chi Ziyang Yan Nianping Yan Jinling Liu Rongxia Huang Xilin Wang 

机构地区：[1]Engineering Laboratory of Power Equipment Reliability in Complicated Coastal Environments,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China [2]Key Laboratory of Engineering Dielectrics and Its Application,Ministry of Education,Harbin University of Science and Technology,School of Electrical and Electronic Engineering,Harbin University of Science and Technology,Harbin 150080,China [3]State Grid Tianjin Chengxi Electric Power Supply Company,Tianjin 300113,China [4]State Grade Jiangxi Electric Power Research Institute,Nanchang 330096,China [5]School of Mechanics and Aerospace Engineering Southwest Jiaotong University,Chengdu 611756,China [6]School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China

出　　处：《Journal of Advanced Ceramics》2023年第12期2382-2388,共7页先进陶瓷（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(52077118);Guangdong Basic and Applied Basic Research Foundation(2021A1515011778);Key Laboratory of Engineering Dielectrics and Its Application(Harbin University of Science and Technology),Ministry of Education(KFM202204).

摘　　要：For the first time,the flash sintering(FS)of high-purity alumina at room temperature,which was previously considered unachievable due to its low electrical conductivity,was conducted herein.The electrical arc originating from surface flashover was harnessed to induce FS at room temperature and low air pressure.The successful FS of high-purity alumina was realized at 60 kPa under the arc constraint,resulting in a notable relative density of the alumina sample of 98.7%.The electric–thermal coupling between the arc and high-purity alumina sample during the arc-induced FS process was analyzed via the finite element simulation method.The results revealed the thermal and electrical effects of the arc on the sample,which ultimately enhance the electrical conductivity of the alumina sample.The formation of a conductive channel on the sample surface,a result of increased electrical conductivity,was the pivotal factor in achieving FS in high-purity alumina at room temperature.The arc constraint technique can be applied to numerous materials,such as ionic conductors,semiconductors,and even insulators,under room-temperature and low-air-pressure conditions.

关 键 词：flash sintering(FS) high-purity alumina arc constraint electric-thermal coupling simulation 

分 类 号：TQ174.65[化学工程—陶瓷工业]