| 동결건조공정을 이용한 다공성 세라믹스의 미세구조 제어 |
| 황해진, 문지웅1 |
인하대학교 신소재공학부
1요업 (세라믹 )기술원 |
| Microstructure Control of Porous Ceramics by Freeze-Drying of Aqueous Slurry |
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| ABSTRACT |
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In this study, we proposed new forming process for a porous ceramic body with unique pore structure. h tubular-type porous NiO-YSZ body with radially aligned pore channels was prepared by freeze-drying of aqueous slurry. A NiO-YSZ slurry was poured into the mold, which was designed to control the crystallization direction of the ice, followed by freezing. Thereafter the ice was sublimated at a reduced pressure. SEM observations revealed that the NiO-YSZ porous body showed aligned large pore channels parallel to the ice growth direction, and fine pores are formed around the outer surface of the tube. It was considered that the difference in the ice growth rate during the freezing process resulted in such a characteristic microstructure. Bilayer consisting of dense thin electrolyte film of YSZ onto the tubular type porous body has been successfully fabricated using a slurry-coating process followed by co-firing. It was regarded that the obtained bilayer structure is suitable for constructing electrode-support type electrochemical devices such as solid oxide fuel cells. |
| Key words:
Freeze-drying, Porous body, NiO-YSZ, Porosity, Thin film, Bilayer, SOFC |
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