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J. Korean Ceram. Soc. > Volume 40(11); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(11): 1120.
doi: https://doi.org/10.4191/kcers.2003.40.11.1120
분쇄-침전을 이용한 다결정 YAG 세라믹스의 합성
홍석범, 정현기, 심수만
홍익대학교 재료공학부
Synthesis of Polycrystalline YAG Ceramics by Milling-precipitation
Yttrium Aluminum Garnet (YAG) powders were prepared by precipitation of Y hydroxides during milling of alumina powders. The powder calcined at 1200$^{circ}C$ for 4 h contained a small amount of Yttrium Aluminum Monoclinic (YAM) in addition to YAG. However, phase-pure YAG was obtained in the compact of the milled powder with an average particle size of 0.57 ${mu}$m at 1300$^{circ}C$, which is much lower than those (l500∼1600$^{circ}C$) for a mixed oxide method. The powder was found to exhibit an excellent sinterability regardless of the addition of a sintering aid, SiO$_2$(350 ppm Si). The undoped sample were sintered to a relative density of 98% at l600$^{circ}C$. In contrast, the addition of SiO$_2$ caused a considerable densification to occur at 1500$^{circ}C$ and the relative density reached 97.7%. But the sintering aid had little effect on the densification at 1600$^{circ}C$, showing a similar relative density to the undoped sample.
Key words: YAG, Polycrystalline, Milling, Precipitation, Sinterability
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