| Al2O3/ZrO2요업체에서 공침에 의한 ZrO2입자의 분산 |
| 조명제, 최정림, 박정권, 황규, 이종국1 |
경상대학교 공학연구원
1조선대학교 재료금속공학과 |
| Dispersion of ZrO2 by Coprecipitation in Al2O3/ZrO2Ceramics |
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| ABSTRACT |
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To improve the mechanical properties of $Al_2$O$_3$/ZrO$_2$composites, the homogeneous dispersion of ultra low size ZrO$_2$ particles in $Al_2$O$_3$ceramics have been controlled by coprecipitation method. In case of mechanical mixing of ZrO$_2$ powders with $Al_2$O$_3$, homogeneous dispersion and controlling the ZrO$_2$ size were relatively difficult due to high sintering temperature. So nanosized Zr hydroxide was coprecipitated from ZrOCl$_2$/Y(NO$_3$)$_3$ solution with commercial sub-micron sized $alpha$-alumina (Sumitomo : AES-11(0.4 ${mu}{textrm}{m}$)) and high purity ultra low sized $alpha$-alumina (Taimei Chemical (0.22 ${mu}{textrm}{m}$)) for low temperature sintering. By this partial coprecipitation method, relatively low sized ZrO$_2$ dispersion in $Al_2$O$_3$/ZrO$_2$ composites was achieved at 150$0^{circ}C$-1$600^{circ}C$ of sintering temperature range and their mechanical properties were measured. |
| Key words:
$Al_2$$O_3$/$ZrO_2$ composites, Coprecipitation, Mechanical properties |
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