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.
The change in pore structure is explained by the growth of the freezing solvent and densification.
| Translated title of the contribution | Effect of Tert-Butyl Alcohol Template on the Pore Structure of Porous Tungsten in Freeze Drying Process |
|---|---|
| Original language | Korean |
| Pages (from-to) | 216-220 |
| Number of pages | 5 |
| Journal | 한국분말재료학회지 |
| Volume | 28 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jun 2021 |