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- 공정 계 동결제 슬러리의 동결건조 공정에 의한 Mo 다공체 제조
- 이규태, 서한길, 석명진, 오승탁
- Freeze Drying for Porous Mo with Sublimable Vehicles of Eutectic System
- Gyu-Tae Lee, Han Gil Seo, Myung-Jin Suk, Sung-Tag Oh
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Journal of Powder Materials 2013;20(4):253-257
DOI: https://doi.org/10.4150/KPMI.2013.20.4.253
2서울과학기술대학교 신소재공학과
3강원대학교 재료금속공학과
4서울과학기술대학교 신소재공학과
1Department of Materials Science and Engineering, Seoul National University of Science and Technology
2Department of Materials Science and Engineering, Seoul National University of Science and Technology
3Department of Materials and Metallurgical Engineering, Kangwon National University
4Department of Materials Science and Engineering, Seoul National University of Science and Technology
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Abstract
Freeze drying for porous Mo was accomplished by using MoO_3 powder as the source and camphor-naphthalene eutectic system as the sublimable material. Eutectic composition of camphor-naphthalene slurries with the initial MoO_3 content of 5 vol%, prepared by milling at 55°C with a small amount of oligomeric dispersant, was frozen at -25°C. The addition of dispersant showed improvement of dispersion stability in slurries. Pores were generated subsequently by sublimation of the camphor-naphthalene during drying in air for 48 h. To convert the MoO_3 to metallic Mo, the green body was hydrogen-reduced at 750°C, and sintered at 1100°C for 2 h. The sintered samples, frozen by heated Teflon cylinder, showed large pores with the size of about 40 µm which were aligned parallel to the sublimable vehicles growth direction. The formation of unidirectionally aligned pores is explained by the rejection and accumulation of solid particles in the serrated solid-liquid interface.
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