Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Freeze Drying for Porous Mo with Sublimable Vehicles of Eutectic System

공정 계 동결제 슬러리의 동결건조 공정에 의한 Mo 다공체 제조

  • Lee, Gyu-Tae (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Seo, Han Gil (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Suk, Myung-Jin (Department of Materials and Metallurgical Engineering, Kangwon National University) ;
  • Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 이규태 (서울과학기술대학교 신소재공학과) ;
  • 서한길 (서울과학기술대학교 신소재공학과) ;
  • 석명진 (강원대학교 재료금속공학과) ;
  • 오승탁 (서울과학기술대학교 신소재공학과)
  • Received : 2013.08.02
  • Accepted : 2013.08.21
  • Published : 2013.08.28
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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 $55^{\circ}C$ with a small amount of oligomeric dispersant, was frozen at $-25^{\circ}C$. 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 $750^{\circ}C$, and sintered at $1100^{\circ}C$ for 2 h. The sintered samples, frozen by heated Teflon cylinder, showed large pores with the size of about 40 ${\mu}m$ 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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