Pores Formation Mechanism of Undoped TiO2 Ceramics
Formation mechanism of pores in undoped TiO2 ceramics was investigated.The undoped TiO2 ceramics samples were prepared from anatase TiO2 powders by a traditional solid-state sintering method.Microstructure,chemistry composition and ionic valence of undoped TiO2 ceramics were characterized by SEM,EDS and XPS.Formation mechanism of pores was discussed by combination defect chemistry with materials structure measurement.The results show that there exist trivalence Titanium ion (Ti3+) and grain boundaries absorbed oxygen in undoped TiO2 ceramics samples.Both content of absorbed oxygen in grain boundaries and Ti3+ concentration increase with sintering temperature increasing.There are many gas pores in grains and grain boundaries of undoped TiO2 ceramics samples.The gas pores are mainly originated from lattice oxygen volatilization and oxygen vacancies segregation during high-temperature sintering.
TiO2 ceramic Defect chemistry Pores Microstructure
Jun Yuan Jikang Yan Guoyou Gan Jinghong Du Jianhong Yi
Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming,Yunnan,650093,P R China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
1690-1695
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）