• Title, Summary, Keyword: heat treatment

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Adhesion between Cu-18wt% Cr Alloy Film and Polyimide : Effect of Heat Treatment (Cu-18wt% Cr 합금박막과 폴리이미드사이의 접착력 : 열처리 영향)

  • 임준홍;김영호;한승희
    • Journal of the Korean institute of surface engineering
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    • v.26 no.6
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    • pp.327-333
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    • 1993
  • The effect of heat treatment on the adhesion between Cu-18wt% Cr film and polyimide has been studied by using T-peel test, AES, and XRD. Cu-18wt% Cr alloy and pure Cu films were sputter deposited onto pol-yimide. Cu was electroplated before and after heat treatment at $400^{\circ}C$ for 0.5 hr and 2 hrs respectively. The adhesion of metal film onto polyimide was considerably good before heat treatment, but heat treatment re-duced the peel adhesion strength in all specimens. The reduction in adhesion in adhesion strength values in the specimens which were plated after heat treatment was mainly due to Cr-O rich pahse formed in the metal/polyimide in-terface. In the specimens which were heat treated after plating, the enhanced ductility in the metal films con-tributes the peel adhesion strength by increasing the amount of deformation in metal strips.

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Characteristics of the Post-Weld Heat Treatment of Chrome Low Alloy Material for a Power Plant Boiler (발전 보일러용 크롬 저합금강의 용접후열처리 특성)

  • Whe, Jae-Hoon;Moon, Seung-Jae;Yoo, Hoseon
    • Plant Journal
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    • v.6 no.4
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    • pp.56-62
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    • 2010
  • This study investigated characteristics of the post-weld heat treatment of SA213-T23, which was developed for water wall of the ultra super critical power boiler. The temperature of post weld heat treatment should be $730^{\circ}C$ or higher to reduce hardness of the deposit metal and heat affected zone. Coincidently, the temperature should remain $760^{\circ}C$ or lower to prevent hardness of the base metal from dropping. Hardness decline of deposit metal was trivial according to time when the holding time of heat treatment at $740^{\circ}C$ of post-weld heat treatment gradually increased from initial 15 minutes.

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Effect of Post-Heat-Treatment on Various Characteristics of Commercial Pitch-Based Carbon Fibers

  • Yoon, Sung-Bong;Cho, Chae-Wook;Cho, Dong-Hwan;Park, Jong-Kyoo;Lee, Jae-Yeol
    • Carbon letters
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    • v.8 no.2
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    • pp.127-133
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    • 2007
  • In this study, commercially available pitch-based carbon fibers of general grade were post-heat-treated using a boxtype high temperature furnace at $1800^{\circ}C$, $2000^{\circ}$, $2200^{\circ}C$, and $2400^{\circ}C$, respectively. The fundamental characteristics of each heat-treated carbon fibers were investigated in terms of chemical composition, morphology, thermal stability, X-ray diffraction, single filament tensile test, and electrical resistivity. The result showed that the fiber properties were significantly influenced by the post-heat-treatment, indicating the greater effect with increasing treatment temperature. The carbon contents, thermal stability, and tensile properties of the carbon fibers used here were further increased by the post-heat-treatment, whereas the d-spacing between graphene layers and the electrical resistivity were reduced with increasing post-heat-treatment temperature.

Heat Treatment and Characterization of Serpentine for $CO_2$ Sequestration by Mineral Carbonation (이산화탄소 탄산염광물화용 사문석의 열처리 및 특성평가)

  • Choi, Weon-Kyung;Moon, Seung-Hyun;Cho, Tae-Hwan;Lee, Jae-Keun
    • Transactions of the Korean hydrogen and new energy society
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    • v.16 no.1
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    • pp.74-81
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    • 2005
  • The heat treatment of serpentines for mineral carbonation was studied systematically. Crystallographic, spectroscopic and thermochemical properties were investigated for serpentines before and after heat treatment. Drastic weight loss due to the removal of hydroxy groupe(-OH) occupied in serpentine crystalline was revealed after heat treatment. In XPS results, MgO was founded at heat treated serpentine powders while Mg(OH) was observed at untreated serpentine powders. Metallic oxides originated from serpentine ingredients were regenerated by heat treatment.

The Effect of Heat Treatment Hold Time for Mechanical Properties of Zinc-Magnesium Alloy (아연-마그네슘 합금의 열처리에 따른 기계적 특성 연구)

  • Hwang, Injoo
    • Journal of the Korean Society for Heat Treatment
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    • v.33 no.3
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    • pp.117-123
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    • 2020
  • Due to high corrosion resistance, Zinc has been widely used in the automobile, shipping or construction industries as a galvanizing material. Zinc is popular as a coating element, but its low mechanical strength impede the expansion of applications as a load-bearing structure. The mechanical strength of Zinc can be increased through zinc based alloy process, but the ductility is significantly reduced. In this study, the mechanical strength and ductility of Zinc-Magnesium alloys with respect to heat treatment hold time was investigated. In order to enhance the mechanical strength of Zinc, a Zinc-Magnesium alloy was fabricated by a melting process. The heat treatment process was performed to improve the ductility of Zinc-Magnesium alloy. The microstructure of the heat-treated alloy specimen was analyzed using SEM. The hardness and compressive strength of the specimen were measured by a micro-hardness tester and a nano-indenter, respectively.