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논문 기본 정보

자료유형
학술저널
저자정보
Yeoung-Gyun Yang (Mokpo National University) Ji-Yeon Kwak (Inha University Colleage of Medicine) Heon Kong (Mokpo National University) Sang-Jin Lee (Mokpo National University)
저널정보
한양대학교 세라믹공정연구센터 Journal of Ceramic Processing Research Journal of Ceramic Processing Research 제21권 제4호
발행연도
2020.1
수록면
450 - 455 (6page)

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The sintering behavior of 10 nm sized, nano yttria powder was investigated with powder compacts prepared by variousforming methods with an aqueous system. A well dispersed nano yttria slurry and gelation conditions were determined byexamining rheological behavior according to the pH and the amount of dispersant content. Slip casting was performed on theslurry prepared under optimum dispersion conditions. For comparison, the powder compacts were prepared by uni-axiallypressing the nano powder and the gel powder. When a granular-type gel powder was applied, dry pressing was conducted withless agglomeration, and the green density was improved, unlike the case of using the nano-powder. The most homogeneousmicrostructure was observed for the slip casting sample. As a result of sintering at 1650 oC for 2 hours in atmosphericconditions, the green sample prepared by slip casting showed the highest densification of 98% relative density with 41%shrinkage. In particular, fracture behavior and circular pores were present in the intra-granular area, unlike the cases of pressformed samples. The powder compact using gel powder showed higher sintered density of 93% compared with the pressformed powder compact using nano powder.

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