Journal of Powder Materials

J.K. Lee

3 Articles

Microstructure and Characteristics of Ag-SnO₂ Contact Materials Prepared by Magnetic Pulsed Compaction: J.S. Park, Y.J. Kim, M.H. Lee, H.S. Lee, S.J. Hong, J.K. Lee; J Korean Powder Metall Inst. 2011;18(4):372-377.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.372

Abstract PDF: In this study, we reported the microstructure and properties of Ag-SnO_2 contact materials fabricated by a controlled milling process with subsequent consolidation. The milled powders were consolidated to bulk samples using a magnetic pulsed compaction process. The nano-scale SnO_2 phases were distributed homogeneously in the Ag matrix after the consolidation. The relative density and hardness of the Ag-SnO_2 contact materials were 95~96% and 89~131 Hv, respectively.

Status and Prospect of Tungsten Resources and Tungsten Related Industries: Han-Shin Choi, Y.H. Kim, J.K. Lee; J Korean Powder Metall Inst. 2008;15(6):441-449.; DOI: https://doi.org/10.4150/KPMI.2008.15.6.441

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The Current Status and Securing Strategies of Core Mineral Tungsten Resources
Dohyun Jeong, Seongmin Kim, Hoseok Jeon
Journal of the Korean Society of Mineral and Energy Resources Engineers.2023; 60(5): 341. CrossRef
Industrial Supply Chain Trend of Domestic Tungsten
Joon-Woo Song, Sang-Hyun Lee, Hyun-Seon Hong, Hong-Yoon Kang, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 79. CrossRef

Consolidation Behavior of Ti-6Al-4V Powder by Spark Plasma Sintering: J.H. Kim, J.K. Lee, T.S. Kim; J Korean Powder Metall Inst. 2007;14(1):32-37.; DOI: https://doi.org/10.4150/KPMI.2007.14.1.032

Abstract PDF: Using spark plasma sintering process (SPS), Ti-6Al-4V alloy powders were successfully consolidated without any contamination happened due to reaction between the alloy powders and graphite mold. Variation of microstructure and mechanical properties were investigated as a function of SPS temperature and time. Compared with hot isostatic pressing (HIP), the sintering time and temperature could be lowered to be 10 min. and 900°C, respectively. At the SPS condition, UTS and elongation were about 890 MPa and 24%, respectively. Considering the density of 98.5% and elongation of 24%, further improving the tensile strength would obtain by increasing the SPS pressure.

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