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Synthesis of YAG-Al_2O_3 Nanocomposite Powders by Co-Precipitation Methods

LI Wei-Qun; GAO Lian; WANG Hong-Zhi; GUI Lin-Hua(State Key Lab of Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics,Chinese Academy of Sciences, Shanghai 200050, China)  
YAG-Al_2O_3 nanocomposite powders were prepared by the co-precipitation process.The crystallize temperature and morphology of the composite powder was intensively studiedwith XRD and TEM. The results indicate that above 1300℃, there is only YAG and α-Al_2O_3phases existed. YAG particles with an average size of 100 nm can be observed uniformly dispersedin α-Al_2O_3. Using prepared powders, nearly fully dense sintering body can be fabricated byhot-pressing at 1450℃. The sintering temperature is far lower than 1600℃ reported by otherresearchers. The preparation of YAG-Al_2O_3 nanocomposite powders based on the co-precipitationmethod has promising application with merits of low cost, high production and simple processing.
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