In this study, freeze drying of a porous Ni with unidirectionally aligned pore channels is accomplished by using a NiO powder and camphene. Camphene slurries with NiO content of 5 and 10 vol% are prepared by mixing them with a small amount of dispersant at 50℃. Freezing of a slurry is performed at -25℃ while the growth direction of the camphene is unidirectionally controlled. Pores are generated subsequently by sublimation of the camphene during drying in air for 48 h. The green bodies are hydrogen-reduced at 400℃ and then sintered at 800℃ and 900℃ for 1 h. X-ray diffraction analysis reveals that the NiO powder is completely converted to the Ni phase without any reaction phases. The sintered samples show large pores that align parallel pores in the camphene growth direction as well as small pores in the internal walls of large pores. The size of large and small pores decreases with increasing powder content from 5 to 10 vol%. The influence of powder content on the pore structure is explained by the degree of powder rearrangement in slurry and the accumulation behavior of powders in the interdendritic spaces of solidified camphene.

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

• 정재헌(서울과학기술대학교 신소재공학과) | Jae-Hun Jeong (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
• 오승탁(서울과학기술대학교 신소재공학과) | Sung-Tag Oh (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
• 현창용(서울과학기술대학교 신소재공학과) | Chang-Yong Hyun (Department of Materials Science and Engineering, Seoul National University of Science and Technology) Corresponding Author