- Fabrication of Porous Mo by Freeze-Drying and Hydrogen Reduction of MoO3/Camphene Slurry
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Wonsuk Lee, Sung-Tag Oh
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J Korean Powder Metall Inst. 2012;19(6):446-450.
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DOI: https://doi.org/10.4150/KPMI.2012.19.6.446
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- In order to fabricate the porous Mo with controlled pore characteristics, unique processing by using MoO_3 powder as the source and camphene as the sublimable material is introduced. Camphene-based 15 vol% MoO_3 slurries, prepared by milling at 50°C with a small amount of dispersant, were frozen at -25°C. Pores were generated subsequently by sublimation of the camphene during drying in air for 48 h. The green body was hydrogen-reduced at 750°C, and sintered at 1000-1100°C for 1 h. After heat treatment in hydrogen atmosphere, MoO_3 powders were completely converted to metallic W without any reaction phases. The sintered samples showed large pores with the size of about 150µm which were aligned parallel to the camphene growth direction. Also, the internal wall of large pores and near bottom part of specimen had relatively small pores due to the difference in the camphene growth rate during freezing process. The size of small pores was decreased with increase in sintering temperature, while that of large pores was unchanged. The results are strongly suggested that the porous metal with required pore characteristics can be successfully fabricated by freeze-drying process using metal oxide powders.
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Citations
Citations to this article as recorded by  - Effect of Heat Treatment Atmosphere on the Microstructure of TiH2-MoO3 Powder Mixtures
Ki Cheol Jeon, Sung Hyun Park, Na-Yeon Kwon, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2016; 23(4): 303. CrossRef - Fabrication of Porous Cu by Freeze-drying Process of Camphene Slurry with CuO-coated Cu Powders
Su-Ryong Bang, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2014; 21(3): 191. CrossRef - Synthesis and Antifungal Property of Porous Al2O3with Dispersions of Cu Nanoparticles
Ho-Suk Yoo, Min-Sung Kim, Sung-Tag Oh, Chang-Yong Hyun
Journal of Korean Powder Metallurgy Institute.2014; 21(1): 16. CrossRef - Fabrication of Porous Cu-Ni by Freeze Drying and Hydrogen Reduction of CuO-NiO Powder Mixture
Han Gil Seo, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2014; 21(1): 34. CrossRef - Freeze Drying for Porous Mo with Sublimable Vehicles of Eutectic System
Gyu-Tae Lee, Han Gil Seo, Myung-Jin Suk, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2013; 20(4): 253. CrossRef
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