Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Tert-Butyl Alcohol Template on the Pore Structure of Porous Tungsten in Freeze Drying Process

동결건조 공정에서 Tert-butyl alcohol 기공형성제가 텅스텐 다공체의 기공구조에 미치는 영향

  • Lee, Eui Seon (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Heo, Youn Ji (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Ko, Yun Taek (Department of Advanced Materials Science and Engineering, Hanyang University) ;
  • Park, Jin Gyeong (Department of Advanced Materials Science and Engineering, Hanyang University) ;
  • Cho, Yong-Ho (Department of Advanced Materials Science and Engineering, Hanyang University) ;
  • Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 이의선 (서울과학기술대학교 신소재공학과) ;
  • 허연지 (서울과학기술대학교 신소재공학과) ;
  • 고윤택 (한양대학교 첨단소재공학과) ;
  • 박진경 (한양대학교 첨단소재공학과) ;
  • 좌용호 (한양대학교 첨단소재공학과) ;
  • 오승탁 (서울과학기술대학교 신소재공학과)
  • Received : 2021.05.24
  • Accepted : 2021.06.08
  • Published : 2021.06.28
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Abstract

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 30℃. The slurries are frozen at -25℃, and pores are formed in the frozen specimens by the sublimation of TBA during drying in air. After hydrogen reduction at 800℃ and sintering at 1000℃, 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.

Keywords

Acknowledgement

이 논문은 2021년도 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. 2019R1A2B5B01070587).

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