The effect of tert-butyl alcohol (TBA) as a freezing solvent on the pore structure of a porous tungsten body prepared by freeze-drying is analyzed. TBA slurries with a WO3 content of 10 vol% are prepared by mixing with a small amount of dispersant and binder at 30oC. The slurries are frozen at -25oC, and pores are formed in the frozen specimens by the sublimation of TBA during drying in air. After hydrogen reduction at 800oC and sintering at 1000oC, the green body of WO3 is completely converted to porous W with various pore structures. Directional pores from the center of the specimen to the outside are observed in the sintered bodies because of the columnar growth of TBA. A decrease in pore directionality and porosity is observed in the specimens prepared by long-duration drying and sintering. The change in pore structure is explained by the growth of the freezing solvent and densification.

Abstract
1. 서 론
2. 실험방법
3. 실험결과 및 고찰
4. 결 론
References

• 이의선(서울과학기술대학교 신소재공학과) | Eui Seon Lee (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
• 허연지(서울과학기술대학교 신소재공학과) | Youn Ji Heo (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
• 고윤택(한양대학교 첨단소재공학과) | Yun Taek Ko (Department of Advanced Materials Science and Engineering, Hanyang University)
• 박진경(한양대학교 첨단소재공학과) | Jin Gyeong Park (Department of Advanced Materials Science and Engineering, Hanyang University)
• 좌용호(한양대학교 첨단소재공학과) | Yong-Ho Choa (Department of Advanced Materials Science and Engineering, Hanyang University)
• 오승탁(서울과학기술대학교 신소재공학과) | Sung-Tag Oh (Department of Materials Science and Engineering, Seoul National University of Science and Technology) Corresponding Author