| 동결 주조법으로 제조된 티타늄 옥사이드 폼의 구조 연구 |
| 윤현정, 최희만, 최혜림 |
| 국민대학교 신소재공학부 |
| A Morphological Study on the Titanium-Oxide Foams Processed Using Freeze-Casting |
| Hyunjung Yoon, Heeman Choe, Hyelim Choi |
| School of Advanced Materials Engineering, Kookmin University |
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| ABSTRACT |
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The $TiO_2$ foam synthesized using freeze-casting is a promising photocatalyst and photovoltaic electrode for a variety of energy applications, because the freeze-casting technique is easy to use, cheap, and suitable for mass-production. Despite its several advantages, little scientific information is available on the processing and morphology of the $TiO_2$ foams processed by freeze-casting. In particular, no systematic study has been performed on the microstructural evolution and morphological change of the rutile-phase $TiO_2$ foams during sintering. Therefore, in the present study, several $TiO_2$ foam samples were produced using the freeze-casting technique, which were then sintered at a relatively high temperature of $1200^{circ}C$ for 1, 2, and 4 h to compare the morphological changes in the microstructure and to understand the effects of processing parameters of the rutile-phase $TiO_2$ foams. The foam ligament size increased near linearly with increasing sintering time whereas the average pore size decreased only slightly with increasing sintering time, with changes in particle morphology from sphere to rod and complete phase transformation from anatase to rutile. |
| Key words:
Porous ceramic, Freeze-casting, Ceramic foams, Titanium dioxide |
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