Sintering kinetics involving grain growth and densification of Mg-PSZ nanopowders  

作　　者：Yi-ming She Jie-fu Lang Di An Chao-wei Si Xu-dong Luo Zhi-peng Xie Jie-gang You 

机构地区：[1]School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China [2]Institute of Advanced Structures,Beijing Institute of Technology,Beijing 100081,China [3]State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Journal of Iron and Steel Research International》2022年第7期1138-1144,共7页

基　　金：The work has been supported by the National Key Research and Development Program of China(No.2017YFB0310401);National Natural Science Foundation of China(Nos.U1908227 and U20A20239).

摘　　要：Sintering kinetics have been found to be effective in judging the evolution of ceramics.By using magnesium oxide-partially stabilized zirconia(Mg-PSZ)powder prepared by co-precipitation as raw materials,the evolution of densification and grain growth for Mg-PSZ ceramics were investigated.The results indicated that the densification of samples was mainly controlled by grain boundary diffusion in intermediate sintering stage.During the sintering process,the grain growth mechanisms included normal grain growth,abnormal grain growth and solid solution drag-controlled grain growth.Interestingly,the apparent activation energy for grain growth of Mg-PSZ ceramics is lower than that of ZrO_(2)–Y_(2)O_(3)ceramics in the solid solution drag-controlled grain grow process,which will cause grain to grow easily.The sintering kinetics and microstructure of Mg-PSZ ceramics were studied,and the kinetic equation of grain growth at different temperatures was established.The results show that the strength difference between Mg-PSZ and yttrium oxide-stabilized zirconia is closely related to the easy grain growth of Mg-PSZ ceramics.

关 键 词：Magnesium oxide-partially stabilized zirconia Sintering kinetics Grain growth mechanism Densification mechanism Sizing nozzle 

分 类 号：TQ174[化学工程—陶瓷工业]