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Ni 첨가 용융아연 도금욕에서 제조된 도금강판의 도금조직
이도재,이경구,기회봉 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.1
The microstructure of galvanized steel in Ni containing galvanizing bath have been investigated. An Al-killed steel plate containing low Si was used as substrate for galvanizing. The size of spangle and alloyed layer were observed under an optical microscope, SEM and EDS. The spangles of galvanized steel in Zn bath appeared to be "regular", while those of the galvanized in Zn-0.1Ni bath appeared to be "minimized" with higher brightness. The alloyed layer of galvanized steel in Zn-Ni bath were thinner than the one galvanized in Zn bath. The reduction of alloyed layer by addition of Ni in Zn bath was due to the formation of Zn-Fe-Ni compounds which act as a diffusion barrier of Fe-Zn at the ζ-(η-Zn) boundary.
용융아연 도금욕조에서 Ni 첨가가 석출물의 생성거동에 미치는 영향
이도재,이경구,기회봉,소인영,진영구 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.4
The purpose of this study is to make clear the effects of Ni on the behavior of precipitate formation in Vi added galvanizing bath, which has various Ni contents from 0.03wt% to 0.5wt%. The morphology of the precipitate changed with Ni addition from a needle like rectangular ζ-phase to a globular polygonal Zn-Fe-Ni phase. Al addition in Ni containing Zn-bath resulted in forming the Al-Ni intermetallic compounds such as Al₃Ni₂ and Al₂Ni which consist most of top precipitates. In the range of higher content of 0.07wt% Vi in Zn-bath, Al-Ni intermetallic compound was formed sensitively with small amount of Al addition.
이경구,윤동주,기회봉,강창석,이도재 ( Kyung Ku Lee,Dong Ju Yoon,Whe Bong Ghi,Chang Sug Kang,Doh Jae Lee ) 한국열처리공학회 1998 熱處理工學會誌 Vol.11 No.3
N/A An oxidation behavior of 304 and 316 stainless steels were studied in dry air. After solution treatment, specimens were polished up to 1㎛ A1₂O₃ grade and then subjected to oxidation treatment in dry air at 800℃∼1200℃. The oxidation behavior between matrix and oxide scale was analyzed with SEM, EDS and XRD. When oxidation treatment was conducted at 1200℃, large thickness of Fe oxide scale was formed on top of surface and fine (Cr,Fe)₂O₃oxide film was formed below it. Cr rich zone existed at interface between metal and (Cr,Fe)₂O₃oxide layer, and it was believed that this zone acted as obstacle to oxidation. Most of Ni was detected at the interface between metal and (Cr,Fe)₂O₃and also detected at the interface between Fe₂O₃and (Cr,Fe)₂O₃.
Al/SiC 복합재료에서 보강재에 도금된 금속층이 젖음성에 미치는 영향
이도재,이경구,기회봉 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.2
Effects of coating treatment of metallic Cu and Ni-P film on SiC fiber for Al/SiC composite were studied. Ni-P and Cu were deposited on SiC fiber by electroless plating method. The morphology of coated film and wetting behavior of composite were analysed by SEM The coating treatment on SiC fibers improved wettability of Al melt on SiC comparing to the non wated SiC fiber, and especially Ni-P coating turned out most effective. This improved wettability seems strongly concerned to the increase of chemical reactivity between coating layer and Al matrix. The reaction between Al melt and coated metallic film forms eutetic melt, and those reaction may accelerates the break down of Al oxide film to promote wettability positively.
이경구,윤동주,기회봉,최답천,이도재 한국열처리공학회 1999 熱處理工學會誌 Vol.12 No.1
In the present study, oxidation behavior of 304 and 316 stainless steels Was investigated. After solution treatment, specimens were polished up to 1㎛ Al₂O₃grade and then subjected to oxidation treatment in dry air. The range of temperature was used for oxidation treatment at 300℃∼500℃ and TEM was used for analyzing the components and structure of oxide film. Also, these results were compared with the results of ESCA and TG. According to the results of TEM analysis, it was found that Cr oxide film was formed on top of the surface after room temperature oxidation but amorphous Fe oxide was formed on top of the surface and polycrystalline (Cr,Fe)₂O₃was formed below the amorphous Fe oxide layer after 500℃ oxidation treatment. The oxidized specimens at 500℃ showed that 316 stainless steel resists more strongly to grain and grain boundary oxidation than 304 stainless steel. These results suggested that Mo component resolved in 316 stainless steel matrix suppressed the formation of Cr carbide which may results in local Cr deplete area.
고강도 내마모 금속간화합물 / Al 기지 복합재료의 개발을 위한 기초연구
최답천,이경구,이호종,기회봉 ( Dap Chun Choi,Kyung Ku Lee,Ho Jong Lee,Whe Bong Ghi ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.3
N/A The interfacial phenomena between intermetallic compounds and Al matrix have been studied at 680℃ for various holding time under argon atmosphere. Model experiments were performed using Fe, Ni and Ti wire to observe the interfacial phenomena. The interfacial phenomena between intermetallic compounds and Al matrix were analysed by optical microscope, SEM and EDX. The results of EDX and XRD showed that the interfacial zones of intermetallic compounds/Al matrix were composed of several intermetallic layers. The reaction layer was varied with holding time and heating temperature. The investigation of interfacial zones in the specimen as a function of heat treatment time at 680℃ indicated that the best heat treatment condition for squeeze casting was 680℃ for 5min.