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Journal of the Korean Ceramic Society 1991;28(4): 338. |
| $Al_2O_3$ 로 피복시킨 세라믹 복합분체의 제조 및 특성 : (II) $Al_2O_3$-$TiO_2$ 복합분체 |
| 현상훈, 정형구 |
| 연세대학교 요업공학과 |
| Preparation and Characteristics of Ceramic Composite Powders Coated with $Al_2O_3$ : (II) Composite Powders of $Al_2O_3$-$TiO_2$ |
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| ABSTRACT |
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The alumina-titania composite powders coated with Al2O3 were prepared by the method of hydrolysis-deposition of mixed aluminium salt solution of Al2(SO)4-Al(NO3)3-Urea. The effects of coating-process parameters on the characteristics of coated composite powders were also investigated. As the content of TiO2 dispersed in deionized water increased, the coated composite powders were found to be more uniform in size and unagglomerated. When TiO2 powders were coated for 30 min, the optimum TiO2 content in the coating process was 400 mg/ι. The size of TiO2 particle was increased approximately from 0.7${mu}{textrm}{m}$ to 1.0${mu}{textrm}{m}$ through coating of Al2O3. The IEP of coated composite powders was pH=8.3 identical to the value of aluminium hydroxides and the zeta-potential showed nearly similar values each other. When heat treating coated composite powders at 130$0^{circ}C$, only two phases of TiO2(rutile) and Al2TiO5 were observed. These results showed that the suface of TiO2 could be uniformly coated with the aluminium hydroxide. |
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