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중온용 SOFC 분리판에 적용하기 위한 스테인레스 304 소재의 전처리에 따른 고온 산화거동에 관한 연구
문민석(MinSeok Moon),우기도(KeeDo Woo),송준혁(JoonHyuk Song),김원태(WonTae Kim),오제하(JeHa Oh),강신재(ShinJae Kang) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
Solid oxide fuel cells (SOFCs) have many attractive features for widespread applications for Generation system. Recently investigation for bipolar plate is focus on the Metallic bipolar plate. Solid Oxide Fuel Cell was operated to high temperature than other Fuel cell system, approximately at 800~1000C. Presently day was investigated reduced operation temperature at 600~800C, that is Intermediate temperature SOFC. Solid Oxide Fuel Cell has required of low cost and high-temperature corrosion resistance during the operation. In this case, apply to 304 stainless steels with different pre-surface treatment with no coating treatment on the surface, As-polished, As-Received and Sand Blast on the surface. And 304 was exposure to high temperature oxidation environment, in the box furnace at 800C, and review to oxidation behavior with each material during the different exposures time.(100hrs, 400hrs). Oxidation behavior was measured by SEM, EDS and XRD inspection.
고주파 열처리 공정 기술을 통한 고압용 경량 파이트 제조 공정 기술 개발
문민석(MinSeok Moon),유명한(MyoungHan Yoo),송준혁(JoonHyuk Song),박나라(NaRa Park),노종일(JongIl Rho),오제하(JeHa Oh),김원태(WonTae Kim),문상돈(SangDon Moon),김은성(EunSung Kim) 한국자동차공학회 2018 한국자동차공학회 지부 학술대회 논문집 Vol.2018 No.5
Concrete pump truck has typically distributed a weight balance on the two positions. The upper-part include the conveying pipe and the joints zone. The lower-part is included in the outrigger to enhance the position balance concerning the concrete pump truck. The life cycle of conveying pipe depends on the pipe wall layer state. A sing-wall pipe has a shot lifecycle and a low price. A Multi-wall pipe has a double lifecycle than single-wall pipes and a high price. This experiment is focused on the using a single-wall pipe and changing the microstructure thorough the high-frequency heat-treatment. High-frequency heat-treatment will supply the long lifecycle with a cheap single-wall pipe because of the microstructure of inside hardened in AISI 1045. After heat-treatment, the mechanical property of specimen are examined through the tensile strength, elongation, and hardness test. Additionally, the wear resistance evaluation has evaluated to the sand abrasion resistance.
스테인레스 430 소재의 전처리에 따른 고온 산화거동에 관한 연구
문민석(MinSeok Moon),우기도(KeeDo Woo),송준혁(JoonHyuk Song),오제하(JeHa Oh),강신재(ShinJae Kang) 한국자동차공학회 2009 한국자동차공학회 지부 학술대회 논문집 Vol.2009 No.10
Solid Oxide Fuel Cell (SOFCs) was high temperature operating Fuel cell system. Normally, this system operating temperature is approximately at 800~ 1000C. Fuel cell's efficiency was related with operating temperature. Operating temperature is increased that fuel cell efficiency is increased. Generally, SOFC was used to Bipolar plate material that Ceramic material with doped on the surface. Because SOFC was exposed high temperature atmosphere, ceramic material has stratified properties at the high temperature. At recent times, SOFC investigated focus on reduced operating temperature, IT SOFC (operation temperature at 600~800C) and LT SOFC (operation temperature at 400~600C). The aim of this study, apply to 430 stainless steels with different surface pre-treatment 3types, As-polished, As-Received and Sand Blast on the surface and no thermal satisfied coating treatment on the surface. 430 materials was exposure in the box furnace, at 800C with high temperature oxidation environment. And it observed to oxidation behavior with different exposures time. Oxidation behavior was analysis by SEM, EDS and XRD inspection.
자동차 부품용 CFRP 및 고진공 다이캐스팅 알루미늄 합금 시편의 표면 조건에 따른 전기 화학적 거동에 관한 연구
김영환(YoungHwan Kim),문민석(MinSeok Moon),김한주(Han Joo Kim) 한국자동차공학회 2020 한국 자동차공학회논문집 Vol.28 No.2
This study investigated the corrosion behaviors of CFRP materials and high vacuum die-cast aluminum alloys that were used in automobiles to evaluate the effects of different roughness conditions. Experimental tests were performed based on electrochemical characterization(potentiodynamic corrosion test), surface morphology(FESEM), and component analysis(EDS) under the 5 wt% NaCl aqueous solution. Both CFRP and the Al alloy showed similar results in which corrosion rate increased as surface roughness increased, and the corrosion of the Al alloy occurred faster than that of CFRP. Also, in the morphological analysis after testing, the composition change in the CFRP was not affected by surface roughness; however, Al alloy compounds underwent changes largely due to the formation of oxides. The anticorrosive treatment technology to suppress corrosion and improve the durability of the Al alloy will be considered in future applications.
고압 다이캐스팅 공법을 이용한 마그네슘 시트프레임 개발
유명한(MyeongHan Yoo),문민석(MinSeok Moon),송준혁(JoonHyuk Song),오상엽(SangYeob Oh),오제하(JeHa Oh),양성모(SungMo Yang),강신재(SinJae Kang) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this study, the express bus seat-frame components were substituted by the Mg alloy from the steel for the light weight. Mg alloy seat-frame was manufactured by the high pressure die-casting process. The designs of the existing steel alloy’s seat-frame were analyzed to check the safety requirements, and then were designed for a high pressure die-casting process with considering the fluidity of Mg alloy. The die-casting conditions were decided with the solidification and fluidity analysis, and die-casting mold was made with this results. Normally, the seat-frame was consisted of arm-rest and seat-back-frame. To confirm the Mg seat-frame safety, it was that mechanical property, vertical load, and forward moment, and endurance fatigue were simulated and tested. Finally, the light-weight Mg alloy seat-frame was made by high pressure die-casting with the seat-back-frame 35% weight-reduction and the arm-rest 30% weight-reduction compare to the steel alloy seat-frame.
고진공 다이캐스팅 공법을 적용한 알루미늄 트렁크 리드 인너 판넬의 미세 조직 및 기계적 특성
이민재(Minjae Lee),김대업(Daeup Kim),문민석(Minseok Moon),송준혁(Joonhyuk Song),이성룡(Sungryong Lee),강동하(Dongha Kang),김기영(Kiyoung Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
High vacuum die casting allows the casting products heat treatable with aid of minimized gas contents. therefore it shows improved mechanical properties. In this study, The weight of manufactured trunk lid inner panel is reduced by 18% with the comparison of steel trunk lid inner panel. To investigate microstructure and inspection defect of the aluminum trunk lid inner panel used optical microscope and computer tomography, blister, respectively. And to evaluate mechanical properties used hardness, tensile, residual stress. The results indicated conventional properties of high vacuum die casting, and there are no definite difference.