Effect of Calcination Temperature on Phase Transformation and Microstructure of Al2O3/GdAlO3 Compound Powder Prepared by Co-precipitation Method
A coprecipitation method was applied to synthesize Al2O3/GdAlO3 compound powder,using ammonia as the precipitator.Gadolinium oxide and aluminium nitrate were used as the raw materials with the eutectic ratio (77 mol% Al3+-23 mol% Gd3+).The precursor was calcined at different temperatures from 1200 to 1600 ℃.The phase identifications at different temperatures were characterized by X-ray diffractometry (XRD).The growth morphology of particles were investigated using field emission electro microscopy (FE-SEM).The results reveal that GdAlO3 crystallized earlier than α-Al2O3.The diffraction peaks of α-Al2O3 phase were observed after calcination at 1300℃ for 1 h.Metastable phase Gd3Al5O12 underwent complete decomposition at 1600℃ for 1 h.Gadolinium aluminate and α-Al2O3 showed different growth mechanism during the calcination process.The average grain size of the calcined powder increased from ~40 to ~900 nm as the calcination temperature increased from 1200 to 1600 ℃.
Al2O3 GdAlO3 phase transformation morphology
Shuai Sun Qiang Xu
National Key Laboratory of Science and Technology on Materials under Shock and Impact,School of Materials Science and Engineering,Beijing Institute of Technology,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
535-538
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）