- Thermoelectric Property of Ball Milled Bi-Te-Sb Powder
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Ji-Hun Yu, Seung-Chul Bae, Gook-Hyun Ha, Byoung-Kee Kim, Gil-Gun Lee
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J Korean Powder Metall Inst. 2005;12(6):387-392.
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DOI: https://doi.org/10.4150/KPMI.2005.12.6.387
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- The p-type semiconductor Bi_2Te_3-Sb_2Te_3 thermoelectric materials were fabricated by melting, milling and sintering process and their thermoelectric properties were characterized. The compound materials were ball-milled with milling time and the powders were sintered by spark plasma sintering process. The ball milled powders had equiaxial shape and approedmately 1~3µm in size. The figure of meritz of sintered thermoelectric materials decreased with milling time because of lowered electrical resistivity. The thermoelectric properties of Bi_2Te_3-Sb_2Te_3 materials have been discussed in terms of electrical property with ball mill process.
- Production and Application of Nanoparticles by the Chemical Vapor Condensation Process
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Jin-Chun Kim, Gook-Hyun Ha, Chul-Jin Choi, Byoung-Kee Kim
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J Korean Powder Metall Inst. 2005;12(4):239-248.
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DOI: https://doi.org/10.4150/KPMI.2005.12.4.239
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Citations to this article as recorded by  - Synthesize of Nd2Fe14B Powders from 1-D Nd2Fe14B Wires using Electrospinning Process
Nu Si A Eom, Su Noh, Muhammad Aneeq Haq, Bum Sung Kim
Journal of Korean Powder Metallurgy Institute.2019; 26(6): 477. CrossRef
- Carbothermal Reduction of Oxide Powder Prepared from Waste WC/Co Hardmetal by Solid Carbon
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Gil-Geun Lee, Gook-Hyun Ha
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J Korean Powder Metall Inst. 2005;12(2):112-116.
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DOI: https://doi.org/10.4150/KPMI.2005.12.2.112
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- In the present study, the focus is on the analysis of carbothermal reduction of oxide powder prepared from waste WC/Co hardmetal by solid carbon under a stream of argon for the recycling of the WC/Co hard-metal. The oxide powder was prepared by the combination of the oxidation and crushing processes using the waste WC-8 wt.%Co hardmetal as the raw material. This oxide powder was mixed with carbon black, and then this mixture was carbothermally reduced under a flowing argon atmosphere. The changes in the phase structure and gases discharge of the mixture during carbothermal reduction was analysed using XRD and gas analyzer. The oxide powder prepared from waste WC-8wt.%Co hardmetal has a mixture of WO_3 and CoWO_4. This oxide powder reduced at about 850°C, formed tungsten carbides at about 950°C, and then fully transformed to a mixed state of tungsten carbide (WC) and cobalt at about 1100°C by solid carbon under a stream of argon. The WC/Co composite powder synthesized at 1000°C for 6 hours from oxide powder of waste WC-8wt.%Co hardmetal has an average particle size of 0.3 µm.
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Citations
Citations to this article as recorded by - Effects of mechanical milling on the carbothermal reduction of oxide of WC/Co hardmetal scrap
Gil-Geun Lee, Gook-Hyun Ha
Metals and Materials International.2016; 22(2): 260. CrossRef - Recovery of Tungsten from WC/Co Hardmetal Sludge by Alkaline Leaching Hydrometallurgy Process
Gil-Geun Lee, Ji-Eun Kwon
Journal of Korean Powder Metallurgy Institute.2016; 23(5): 372. CrossRef - Recovery of tungsten carbide from hard material sludge by oxidation and carbothermal reduction process
Woo-Gwang Jung
Journal of Industrial and Engineering Chemistry.2014; 20(4): 2384. CrossRef - Trend on the Recycling Technologies for the used Tungsten Carbide(WC) by the Patent and Paper Analysis
Jin-Ki Jeong, Jae-Chun Lee, Sang-Woo Park, Kyung-Seok Kang
Journal of the Korean Institute of Resources Recycling.2012; 21(1): 82. CrossRef
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