Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Freeze Drying Process and Pore Structure Characteristics of Porous Cu with Various Sublimable Vehicles

다양한 동결제를 이용하여 동결건조 공정으로 제조한 Cu 다공체의 기공구조 특성

  • Lee, Gyuhwi (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Suk, Myung-Jin (Department of Materials Science and Engineering, Kangwon National University) ;
  • Jeong, Young-Keun (Graduate School of Convergence Science, Pusan National University)
  • 이규휘 (서울과학기술대학교 신소재공학과) ;
  • 오승탁 (서울과학기술대학교 신소재공학과) ;
  • 석명진 (강원대학교 신소재공학과) ;
  • 정영근 (부산대학교 융합학부)
  • Received : 2020.05.19
  • Accepted : 2020.06.06
  • Published : 2020.06.28
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Abstract

The effect of sublimable vehicles on the pore structure of Cu fabricated by freeze drying is investigated. The 5 vol% CuO-dispersed slurries with camphene and various camphor-naphthalene compositions are frozen in a Teflon mold at -25℃, followed by sublimation at room temperature. After hydrogen reduction at 300℃ and sintering at 600 ℃, the green bodies of CuO are completely converted to Cu with various pore structures. The sintered samples prepared using CuO/camphene slurries show large pores that are aligned parallel to the sublimable vehicle growth direction. In addition, a dense microstructure is observed in the bottom section of the specimen where the solidification heat was released, owing to the difference in the solidification behavior of the camphene crystals. The porous Cu shows different pore structures, such as dendritic, rod-like, and plate shaped, depending on the composition of the camphornaphthalene system. The change in pore structure is explained by the crystal growth behavior of primary camphor and eutectic and primary naphthalene.

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