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Journal of the Korean Ceramic Society 1990;27(3): 361. |
| 공침법으로 제조한 $ZrO_2$＋3m/o $Y_2O_3$계 분체의 특성(I) : 정방정 Zirconia분체의 안정성 |
| 홍기곤, 이홍림 |
| 연세대학교 공과대학 요업공학과 |
| Properties of the System $ZrO_2$＋3m/o $Y_2O_3$ Powder Prepared by Co-precipitation Method(I) : Stability of Tetragonal ZrO2 Powder |
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| ABSTRACT |
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The properties of the powder of ZrO2＋3m/o Y2O3 system prepared by co-precipitation method at the pH values of 7, 9, 10 and 11 were investigated. ZrOCl2.8H2O and YCl3.6H2O were used as starting materials and NH4OH as a precipitation agent. Zirconium hydroxide near by Zr(OH)4 structure showed more excellent crystallinity and lower formation temperature of tetragonal ZrO2. In the range of this study, cubic ZrO2 was not formed and stability of tetragonal ZrO2 prepared in the conditiion of pH 7 was most excellent. Average particle sizes and specific surface areas of tetragonal ZrO2 powders, prepared as calcining amorphous zirconium hydroxides at $600^{circ}C$ for 1h, were 0.6-0.8${mu}{textrm}{m}$ and 45-70$m^2$/g, respectively. |
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