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Cu 배선 확산 방지용 전해 Ni-Re-P 합금 피막의 열적 안정성
강성군 ( Sung Goon Kang ),조진기 ( Jin Ki Cho ),김문태 ( Moon Tae Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 대한금속·재료학회지 Vol.45 No.5
Using electrodeposition, the influence of Re on thermal stability of Ni-P films was studied. Ni-P and Ni-Re-P films were electrodeposited on Cu plates in a sulfamate bath respectively. Electrodeposition was carried out at 1A/dm2 and the film`s thickness was 170nm. The concentration of P and Re in the films was analyzed by WDXRF(Wave Dispersive X-ray Fluorescence Spectrometers) and the concentration was 6wt.% and 10wt.% respectively. DSC(Differential Scanning Calorimetry) and XRD(X-ray diffraction) showed that the crystallization temperature of Ni-Re-P films was 76℃ higher than that of Ni-P films. The results indicated that the thermal stability of Ni-Re-P films was superior to that of Ni-P films.
박해덕,강성군,Park, Hae-Duck,Kang, Sung-Goon 한국재료학회 2001 한국재료학회지 Vol.11 No.11
An electrolytic silver plating process has been successfully developed for terminated electrode parts of dielectric ceramic resonator. High adhesion strength and high Qu is obtained and blister occurance is minimized under plating condition with $HNO_3$750 $m\ell/\ell$ and HF $ 250m\ell/\ell$ solution at $25^{\circ}C$ for 20 minutes. Adhesion strength has the highest value, 3.2 kg/mm$^2$ at etching temperature of $25^{\circ}C$. Adhesion strength, Qu and blister occurance are monotonically increased with the thickness of electrodeposition layer. In case of electrodeposition of Ag, Qu value of 380 has obtained higher than in case of electrolytic Cu plating with Qu value of 325. Therefore, terminated electrode parts of dielectric ceramic resonator reducing dielectric loss can be obtained using prensent process.
40Cr 강의 Laser Surface Hardening 에 관한 연구
유능희,강성군,Ryu, Nung-Hee,Kang, Sung-Goon 한국재료학회 2001 한국재료학회지 Vol.11 No.11
In this study, the surface of 40Cr steel was hardened by $CO_2$Laser, and then the microstructural transformations and the hardness distributions of the laser surface hardened layer were observed. The experimental results showed the surface hardening layer was consisted of three parts, which is outmost surface layer of needle martensite, middle layer of martensite and remained pearlite, and transitory boundary layer. In hardness distributions, the surface hardeness of the surface hardening layer had Hv 800~1000, that was 2 to 4 times of matrix's hardness. The hardeness distribution of laser hardening layer that of surface layer hardened by general heat treatment.
A1-25Nb계와 (A1,X)-25Nb계 (X = Cr, Cu, Fe, Mn)의 기계적 합금화에 의한 금속간 화합물의 형성 거동에 관한 연구
최재웅,강성군,Choi, Jae-Woong,Kang, Sung-Goon 한국재료학회 2001 한국재료학회지 Vol.11 No.9
In Al-25Nb binary system, it was observed only formation of $D0_{22}$ $Al_3Nb$ intermetallic compound after 5hr milling but it was not observed formation of meta stable phase like L1$_2$ phase. In this state, $D0_{22}$ $Al_3Nb$ fabricated had nano sized grain of approximately 20nm. Ternary systems, transition metals such as Cr, Cu, Fe, Mn were added 6~12at.% as substitution of Al, showed formation of $D0_{22}$ $Al_3Nb$ like Al-25Nb binary system. In Al- l2Cu-25Nb system, it was observed that broad XRD pattern like amorphization of Al and not observed formation of $D0_{22}$ $Al_3Nb$ after 5hr milling. But there was mixed phase of a lot of amorphous Al and little $D0_{22}$ $Al_3Nb$ through TEM. In the states of unalloyed, 5~7hr milling time, those showed exothermic reaction at 35$0^{\circ}C$, which was formation of $D0_{22}$ $Al_3Nb$ like Al-25Nb binary system. With increasing milling time to 10hr, $D0_{22}$ $Al_3Nb$ was transformed to mixed phase of amorphous and nanocryatlline, having approximately 10nm grain but the meta stable $Al_3Nb$ was not fabricated by adding transition metals.
CrN 코팅구조에 따른 Polymer Electrode Membrane Fuel Cell 금속분리판의 부식특성 비교
백정호,한원규,강성군,Paik, Jung-Ho,Han, Won-Kyu,Kang, Sung-Goon 한국재료학회 2010 한국재료학회지 Vol.20 No.4
Chromium nitride (CrN) samples with two different layer structures (multilayer and single layer) were coated on bipolar plates of polymer electrolyte membrane fuel cells (PEMFC) using the reactive sputtering method. The effects with respect to layer structure on corrosion resistance and overall cell performance were investigated. A continuous and thin chromium nitride layer ($Cr_{0.48}\;N_{0.52}$) was formed on the surface of the SUS 316L when the nitrogen flow rate was 10 sccm. The electrochemical stability of the coated layers was examined using the potentiodynamic and potentiostatic methods in the simulated corrosive circumstances of the PEMFC under $80^{\circ}C$. Interfacial contact resistance (ICR) between the CrN coated sample and the gas diffusion layer was measured by using Wang's method. A single cell performance test was also conducted. The test results showed that CrN coated SUS316L with multilayer structure had excellent corrosion resistance compared to single layer structures and single cell performance results with $25\;cm^2$ in effective area also showed the same tendency. The difference of the electrochemical properties between the single and multilayer samples was attributed to the Cr interlayer layer, which improved the corrosion resistance. Because the coating layer was damaged by pinholes, the Cr layer prevented the penetration of corrosive media into the substrate. Therefore, the CrN with a multilayer structure is an effective coating method to increase the corrosion resistance and to decrease the ICR for metallic bipolar plates in PEMFC.
Al-Ni계의 기계·화학적 방법으로 제조된 Raney Ni의 미세 구조 분석
최재웅,이창래,강성군,Choi, Jae-Woong,Lee, Chang-Rae,Kang, Sung-Goon 한국재료학회 2003 한국재료학회지 Vol.13 No.1
The Raney Ni catalyst was fabricated by mechanochemically process(MC process) in the Al-Ni system. Intermetallic compound obtained by mechanical alloying was leached in an alkaline solution. The characteristics of the mechanically alloyed powder and Raney Ni catalyst were analyzed by XRD, ICP-AES and EXAFS. In Al-50wt.%Ni, the metastable intermetallic compound phase close to AlNi phase was obtained by mechanical alloying unlike Al-Ni equilibrium phase diagram. The metastable intermetallic compound was transformed into $Al_3$$Ni_2$phase via the annealing at $750^{\circ}C$. The microstructure of Raney Ni fabricated by MC process was mainly bcc Ni including fcc Ni.
Ca (OH)2 포화 수용액에서의 Fe 의 부식에 미치는 교류의 영향
김승원(Seoung Won Kim),강성군(Sung Goon Kang) 대한금속재료학회(구 대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.1
The change of the corrosion potential and polarization characteristics of the specimen were measured by applying the technique of alternating voltage variation. The passive film was formed on the surface of Fe in the saturated Ca(OH)2 solution, which had the alkalinity of pH 12.1. The corrosion potential was at first shifted to the negative direction in the range of 0-2,250mV (50Hz), and then back to the positive direction with the rate of 0.5mV/mV AV above 2,250mV. The corrosion potential shift to the negative direction was due to the formation of the n-type passive film on Fe. Above the critical voltage (2,250mV), the breakdown of the passive film shifted the corrosion potential to the positive direction by the net anodic polarization that was resulted from unsymmetrical behavior of the anodic and cathodic polarizations. The effect of alternating voltage on the breakdown of the passive films increased with decreasing frequency and increasing voltage. The passive region in polarization curve disappeared above 2,000mV at the constant frequency of 50Hz, and the frequency above 250Hz had little effect on the polarization at the constant voltage of 2,000mV.