- Freeze Drying for Porous Mo with Sublimable Vehicles of Eutectic System
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Gyu-Tae Lee, Han Gil Seo, Myung-Jin Suk, Sung-Tag Oh
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J Powder Mater. 2013;20(4):253-257.
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DOI: https://doi.org/10.4150/KPMI.2013.20.4.253
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- Freeze drying for porous Mo was accomplished by using MoO_3 powder as the source and camphor-naphthalene eutectic system as the sublimable material. Eutectic composition of camphor-naphthalene slurries with the initial MoO_3 content of 5 vol%, prepared by milling at 55°C with a small amount of oligomeric dispersant, was frozen at -25°C. The addition of dispersant showed improvement of dispersion stability in slurries. Pores were generated subsequently by sublimation of the camphor-naphthalene during drying in air for 48 h. To convert the MoO_3 to metallic Mo, the green body was hydrogen-reduced at 750°C, and sintered at 1100°C for 2 h. The sintered samples, frozen by heated Teflon cylinder, showed large pores with the size of about 40 µm which were aligned parallel to the sublimable vehicles growth direction. The formation of unidirectionally aligned pores is explained by the rejection and accumulation of solid particles in the serrated solid-liquid interface.
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Citations
Citations to this article as recorded by  - Interaction of Solid Particles with the Solidifying Front in the Liquid-Particle Mixture
Ho-Suk Lee, Kyu-Hee Lee, Sung-Tag Oh, Young Do Kim, Myung-Jin Suk
Journal of Korean Powder Metallurgy Institute.2018; 25(4): 336. CrossRef - Freeze drying for porous Mo with different sublimable vehicle compositions in the camphor-naphthalene system
Sung-Tag Oh, Young Do Kim, Myung-Jin Suk
Materials Letters.2015; 139: 268. CrossRef
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