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J. Korean Ceram. Soc. > Volume 35(10); 1998 > Article
Journal of the Korean Ceramic Society 1998;35(10): 1049.
초임계 유체를 이용한 초미립 TiO$_2$ 제조
송정환, 임대영
배재대학교 공과대학 무기재료공학과
Fabrication of Ultra-Fine TiO$_2$ Powders Using Supercritical Fluid
In order to fabricate ideal powders new processing is necessary in which the solute atoms in solution ra-pidly move to mix each other to the degree of molecular level the viscosity of solution should be low not to effect the moving of solute atoms and the powders could be directly obtained as crystalline. Supercritical fluid is defined as condensed gas sated up to its critical pressure and temperature. In this paper su-percritical fluid methods were studied as a new ceramic processing of powder preparation. The crystalline powders of TiO2 which are useful for electronic ceramic materials were fabricated by hydrolysis of titanium (IV) ethoxide using ethanol as a supercritical fluid at the condition of 270$pm$3$^{circ}C$, 7.3 MPa for 2hr. The cry stalline anatase powders could be directly obtained and its primary particle size was 20 min.
Key words: Supercritical fluid method, New ceramic processing, Primary particle, Anatase TiO$_2$ powder
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