Effect of dispersant agent on morphology and properties of YAG powders

The YAG precursor powder was synthesized through forward co-precipitation method. The raw material was a mixture of aluminum nitrate and yttrium nitrate, the precipitant was ammonium hydrogen carbonate, and the dispersant agents were PEG400, PEG800 and PEG1000. The samples were identified with X-ray diffractometer, laser particle size analyzer and SEM. It is shown that the dispersant agents can decrease reunion phenomenon of powders, and pure YAG powder is obtained with PEG400 and PEG800 after being calcined at 1200 ℃ for 60 min. On the other hand, the particle size of the powder obtained by PEG1000 is smaller than those by PEG400 and PEG800. The specific surface area of the former is 1 748.78 m2/kg and the average particle size is 1.42 m, those of the latter are 29.39 and 128.60 m2/kg, 196.14 and 20.55 m respectively.