Preparation of Ultra-fine La3NbO7 Powder by Solid State Reaction
As a new candidate material for the ceramic layer in thermal barrier coatings (TBCs) system,La3NbO7 was synthesized with La2O3 powder and Nb2O5 powder by solid state reaction.The starting powders with a mole ratio of La to Nb of 3∶1 were mixed and then the mixture was calcined under the different temperatures (800℃,1000℃,1200℃) and dwell times (2h,6h,10h).The phase structure of the powder was observed by X-ray diffraction (XRD),and the microstructure of the sample was observed by scanning electron microscope (SEM).The effect of calcination temperature and dwell time on the phase formation were examined.The results indicate that the La3NbO7 powder with single phase can be synthesized successfully at 1200℃ for 10h in air,and the La3NbO7 powders synthesized have an ultra-fine particle size of 0.5~1μm with a granular particle shape.With the temperature increasing,LaNbO4 was synthesized firstly and then La3NbO7 was synthesized with a mole ratio of La2O3 to LaNbO4 of 1 ∶ 1.
La3NbO7 Ultra-fine powder Solid state reaction Thermal barrier coatings
Ling Dai Qiang Xu Shizhen Zhu Ling Liu
School of Materials Science and Engineering,Beijing Institute of Technology,National Key Laboratory of Science and Technology on Materials under Shock and Impact,Beijing 100081,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
158-161
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）