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J. Korean Ceram. Soc. > Volume 34(12); 1997 > Article
Journal of the Korean Ceramic Society 1997;34(12): 1247.
요소를 이용한 활성 이트리아 분말의 합성
영남대학교 금속공학 및 재료공학부
Synthesis of Sinter-active $Y_2O_3$ Powders Using Urea
Sinter-active yttria powders were prepared by a solution precipitation with using a self-decomposing precipitation agent NH2CONH2(urea). The cold-pressed powders can be sintered to full density and the microstructure of grains less than 200 nm at a temperature as low as 120$0^{circ}C$. The activity of the yttria powder has been controlled by varying nucleation conditions during precipitation and by minimizing formation of aggregates. The type of precursor is decisive in preparation of a sinter-active oxide powder, and urea is desirable as a precipitation agent for an active yttrium oxide powder.
Key words: Yttria, Urea, Precipitation, Powders, Sintering, Precursor, Aggregates
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