A homogeneous co-precipitation method to synthesize highly sinterability YAG powders for transparent ceramics

作者：Li Jinsheng; Su Xudong^*; Liu Shaohong; Li Xiaodong; Li Ji Guang; Huo Di

来源：Ceramics International, 2015, 41(2): 3283-3287.

DOI：10.1016/j.ceramint.2014.10.076

• Homogeneous co-precipitation method
• Sulfate ions
• Dispersed powders
• Transparent ceramics

A homogeneous co-precipitation method was developed to synthesize well dispersed yttrium aluminum garnet (YAG, Y3Al5O12) powders. This method ensures the co-precipitation of Y3+ and Al3+, solving the problem of differential precipitation of Y3+ and Al3+ in the conventional homogeneous precipitation method. Furthermore, the pH value can be controlled to be a plateau (around 5.2) during the titration process due to the continuous decomposition of the heated urea which can compensate for the pH reduction when adding the mother salts, which is beneficial to the narrow size distribution of the precipitates. Pure YAG nanopowders can be obtained at 900 degrees C without the formation of impurity phases such as YAM (Y4Al2O9) or YAP (YAlO3). The resultant YAG powders are well dispersed and have excellent sinterability that can be sintered into transparent ceramics at 1700 degrees C by vacuum sintering.

• 出版日期2015-3
• 单位东北大学