Freeze drying for porous Mo with different sublimable vehicle compositions in the camphor-naphthalene system
- Authors
- Oh, Sung-Tag; Kim, Young Do; Suk, Myung-Jin
- Issue Date
- Jan-2015
- Publisher
- ELSEVIER
- Keywords
- Pore structure; Porous Mo; Camphor-naphthalene system; Freeze drying
- Citation
- MATERIALS LETTERS, v.139, pp.268 - 270
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS LETTERS
- Volume
- 139
- Start Page
- 268
- End Page
- 270
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/158218
- DOI
- 10.1016/j.matlet.2014.10.097
- ISSN
- 0167-577X
- Abstract
- The present study demonstrates how the composition of sublimable vehicle in the binary system affects the pore structure of porous body fabricated by freeze drying process. The 5 vol% MoO3 dispersed slurries with various camphor-naphthalene compositions (eutectic of 35 wt% naphthalene, off-eutectic of 30 and 45 wt% naphthalene) was frozen into a mold at 25 degrees C. Pores were generated by sublimation of the vehicles at room temperature. The green bodies were sintered at 1100 degrees C under a hydrogen atmosphere. The sintered bodies with pure Mo phase showed different pore structures such as dendrite, rodlike and plate shape dependent on the composition of the camphor-naphthalene alloys. Considering that the observed pore structures were a replica of the original structure of crystallized vehicles, morphology developments during solidification of camphor-naphthalene alloys were examined, and the relationship between the morphology of vehicle crystal and pore structure was discussed.
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