동결건조 공정에서 Tert-butyl alcohol 기공형성제가 텅스텐 다공체의 기공구조에 미치는 영향
- Title
- 동결건조 공정에서 Tert-butyl alcohol 기공형성제가 텅스텐 다공체의 기공구조에 미치는 영향
- Other Titles
- Effect of Tert-Butyl Alcohol Template on the Pore Structure of Porous Tungsten in Freeze Drying Process
- Author
- 좌용호
- Keywords
- Porous W; Pore structure; Freeze drying; Tert-butyl alcohol
- Issue Date
- 2021-06
- Publisher
- 한국분말야금학회
- Citation
- 한국분말야금학회지, v. 28, NO. 3, Page. 216-220
- 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 30oC. The slurries are frozen at -25oC, and pores are formed in the frozen specimens by the sublimation of TBA during drying in air. After hydrogen reduction at 800oC and sintering at 1000oC, 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.
- URI
- https://www.kci.go.kr/kciportal/ci/sereArticleSearch/ciSereArtiView.kci?sereArticleSearchBean.artiId=ART002734523https://repository.hanyang.ac.kr/handle/20.500.11754/181435
- ISSN
- 1225-7591;2287-8173
- DOI
- 10.4150/KPMI.2021.28.3.216
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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