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1PB-7 리튬전지용 Cu 집전체의 전기화학적 특성연구
박희구,김광현,정하택,김학수,박천춘,염덕형 한국공업화학회 1999 한국공업화학회 연구논문 초록집 Vol.1999 No.1
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알루미늄 5083 합금의 플라즈마 미그 하이브리드 용접시 용접부 미세조직과 기계적 성질 변화에 미치는 용접조건의 영향
박상현,이희근,김진용,정하택,박영환,강정윤,Park, Sang-Hyeon,Lee, Hee-Keun,Kim, Jin-Young,Chung, Ha-Taek,Park, Young-Whan,Kang, Chung-Yun 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.1
The effect of welding condition on microstructure and mechanical property of Plasma-MIG Hybrid Weld between Al 5083 plates(thickness : 10mm) was investigated. 1 pass weld without any defects such as puckering, undercut, and lack of fusion was obtained by 150~200A of plasma current and 5~7mm of welding speed. Gas porosities and shrinkage porosities were existed in the weld near fusion line. As welding speed and plasma current were decreasing, the area fraction of porosity was increasing. The hardness of the weld is increasing as welding speed. On the basis of microstructural analysis, Mg segregated region near dendrite boundaries tends to increase with the welding speed. In the result of hardness test, Distribution of hardness in fusion zone showed little change with the plasma current. However, when the welding speed increased, hardness in weld metal markdly increased. It could be considered that effect of heat input to growth of the dendritic solidification structures. Based on tensile test, tensile properties of weld metal was predominated by area fraction of porosities. Consequently, tensile properties can be controlled by formation site and area fraction of porosity.
Viet Hung Pham,정진석,하용우,김상훈,정하택,정만용,고봉성,황영준 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
Waterborne epoxy–clay nanocomposites were prepared by encapsulation of organoclays in epoxy latexparticles via phase inversion emulsification. The organoclays were exfoliated in the epoxy backbonebefore compounding with a hardener and subsequently dispersing in water. The encapsulation of clayplatelets into the waterborne epoxy latex particle resulted in an exponential increase in particle size,from 5 to 10 times at a clay loading of only 1–2 wt%, respectively. The XRD patterns and TEM imagesshow that clay platelets were well intercalated and exfoliated in the epoxy matrix. The gas barrierperformance of the epoxy–clay nanocomposite strongly depended on the kind of organoclay. The bestoxygen barrier efficiency was approximately 14% at 2 wt% clay loading.