Abstract
The effects of drying temperature on the microstructure of porous W fabricated by the freeze-casting process of tert-butyl alcohol slurry with WO3 powder was investigated. Green bodies were hydrogen-reduced at 800oC for 1 h and sintered at 1000oC for 6 h. X-ray diffraction analysis revealed that WO3 powders were completely converted to W without any reaction phases by hydrogen reduction. The sintered body showed pores aligned in the direction of tertbutyl alcohol growth, and the porosity and pore size decreased as the amount of WO3 increased from 5 to 10v ol%. As the drying temperature of the frozen body increased from -25oC to -10oC, the pore size and thickness of the struts increased. The change in microstructural characteristics based on the amount of powder added and the drying temperature was explained by the growth behavior of the freezing agent and the degree of rearrangement of the solid powder during the solidification of the slurry.
| Translated title of the contribution | Effect of Freeze Drying Condition of WO3/Tert-Butyl Alcohol Slurry on the Microstructural Characteristics of Porous Body |
|---|---|
| Original language | Korean |
| Pages (from-to) | 331-335 |
| Number of pages | 5 |
| Journal | 한국분말야금학회지 |
| Volume | 28 |
| Issue number | 4 |
| DOIs | |
| State | Published - Aug 2021 |