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수소제조를 위한 다공성 FeCrAl 금속 합금 Foam의 NiO 촉매 담지 및 미세구조 분석
이유진,안건형,박만호,이창우,최상현,정주용,조성종,이근재,안효진,Lee, Yu-Jin,An, Geon-Hyoung,Park, Man-Ho,Lee, Chang-Woo,Choi, Sang-Hyun,Jung, Ju-Yong,Jo, Sung-Jong,Lee, Kun-Jae,Ahn, Hyo-Jin 한국재료학회 2014 한국재료학회지 Vol.24 No.8
NiO catalysts were successfully coated onto FeCrAl metal alloy foam as a catalyst support via a dip-coating method. To demonstrate the optimum amount of NiO catalyst on the FeCrAl metal alloy foam, the molar concentration of the Ni precursor in a coating solution was controlled, with five different amounts of 0.4 M, 0.6 M, 0.8 M, 1.0 M, and 1.2 M for a dip-coating process. The structural, morphological, and chemical bonding properties of the NiO-catalyst-coated FeCrAl metal alloy foam samples were assessed by means of field-emission scanning electron microscopy(FESEM), scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS), X-ray diffraction(XRD), and X-ray photoelectron spectroscopy(XPS). In particular, when the FeCrAl metal alloy foam samples were coated using a coating solution with a 0.8 M Ni precursor, well-dispersed NiO catalysts on the FeCrAl metal alloy foam compared to the other samples were confirmed. Also, the XPS results exhibited the chemical bonding states of the NiO phases and the FeCrAl metal alloy foam. The results showed that a dip-coating method is one of best ways to coat well-dispersed NiO catalysts onto FeCrAl metal alloy foam.
방전플라즈마 소결에 의한 SiC-ZrB₂ 도전성 세라믹 복합체 특성
신용덕(Yong-Deok Shin),주진영(Jin-Young Ju),조성만(Sung-Man Jo),이정훈(Jung-Hoon Lee),김철호(Cheol-Ho Kim),이희승(Hee-Seung Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
The composites were fabricated by adding 0, 15, 20, 25[vol.%] Zirconium Diboride(hereafter, ZrB₂) powders as a second phase to Silicon Carbide(hereafter, SiC) matrix. The physical, mechanical and electrical properties of electroconductive SiC ceramic composites by spark plasma sintering(hereafter, SPS) were examined. Reactions between β-SiC and ZrB₂ were not observed in the XRD analysis The relative density of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB₂ composites are 90.97[%], 74.62[%], 77.99[%] and 72.61[%] respectively. The XRD phase analysis of the electroconductive SiC ceramic composites reveals high of SiC and ZrB₂ and low of ZrO₂ phase. The electrical resistivity of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB₂ composites are 4.57×10?¹, 2.13×10?¹, 1.53×10?¹ and 6.37×10?²[Ω · ㎝] at room temperature, respectively. The electrical resistivity of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB2 are Negative Temperature Coefficient Resistance(hereafter, NTCR) in temperature ranges from 25[℃] to 100[℃]. It is convinced that SiC+20[vol.%]ZrB₂ composite by SPS can be applied for heater above 1000[℃].
SPS 소결에 의한 SiC-ZrB₂ 도전성 세라믹 복합체 특성
주진영(Jin-Young Ju),이희승(Hui-Seung Lee),조성만(Sung-Man Jo),이정훈(Jung-Hoon Lee),김철호(Cheol-Ho Kim),박진형(Jin-Hyoung Park),신용덕(Yong-Deok Shin) 대한전기학회 2009 전기학회논문지 Vol.58 No.9
The composites were fabricated by adding 0, 15, 20, 25[vol.%] Zirconium Diboride(hereafter, ZrB₂) powders as a second phase to Silicon Carbide(hereafter, SiC) matrix. The physical, mechanical and electrical properties of electroconductive SiC ceramic composites by Spark Plasma Sintering(hereafter, SPS) were examined. Reactions between β-SiC and ZrB₂ were not observed in the XRD analysis. The relative density of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB₂ composites are 90.93[%], 74.62[%], 74.99[%] and 72.61[%], respectively. The XRD phase analysis of the electroconductive SiC ceramic composites reveals high of SiC and ZrB₂ and low of ZrO₂ phase. The lowest flexural strength, 108.79[㎫], shown in SiC+15[vol.%] ZrB₂ composite and the highest - 220.15[㎫] - in SiC+20[vol.%] ZrB₂ composite at room temperature. The trend of the mechanical properties of the electroconductive SiC ceramic composites moves in accord with that of the relative density. The electrical resistivities of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB₂ composites are 4.57×10?¹, 2.13×10?¹, 1.53×10?¹ and 6.37×10?²[Ωㆍ㎝] at room temperature, respectively. The electrical resistivity of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB₂ are Negative Temperature Coefficient Resistance(hereafter, NTCR) in temperature ranges from 25[℃] to 100[℃]. The declination of V-I characteristics of SiC+20[vol.%]ZrB₂ composite is 3.72×10?¹. It is convinced that SiC+20[vol.%]ZrB₂ composite by SPS can be applied for heater or electrode above 1000[℃]
최형식(Hyeung-Sik Choi),손정호(Jung-Ho Son),조성덕(Sung-Dug Jo),Chang-Man Lee 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
this paper, we have made a new motion control system for a 5 d.o.f autonomous robot arm using one-chip microprocessors. The control system is composed of a main controller and sub-controllers. The main controller is composed of an ARM board to control the motors sequentially, and the sub-controllers is composed of the one-chip microprocessor, PIC16f873 to control the motion of the motors along a specified paths. The controllers are communicated using the UART communication system based on a developed protocol. the developed control system was applied to the 5 D.O.F. robot system, and experimental results of the position and velocity control is presented.
김원종(Won-Jong Kim),이충석(Choong-Seok Lee),채승수(Seong-Su Chae),김택수(Teak-Su Kim),이상민(Sang-Min Lee),박휘근(Hwi-Keun Park),조성만(Sung-Man Jo),송덕재(Duck-Jae Song),이종찬(Jong-Chan Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
A Structural analysis has been carried out for CNC Micro Center development. The main frame, turret base, and machine column have been modelled using Solid Edge Software and analyzed using ANSYS Program. The analytical results indicate that the designed CNC Micro Center is stable at 3000-3600 rpm of spindle, which is commonly used range of rpm in this machine. The structual deformation has been reduced from 74㎜ to 0.3㎛.
김원종(Won-Jong Kim),이충석(Choong-Seok Lee),채승수(Seong-Su Chae),김택수(Teak-Su Kim),이상민(Sang-Min Lee),박휘근(Hwi-Keun Park),조성만(Sung-Man Jo),송덕재(Duck-Jae Song),이종찬(Jong-Chan Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
A Structural analysis has been carried out for CNC Micro Center development. The main frame, turret base, and machine column have been modelled using Solid Edge Software and analyzed using ANSYS Program. The analytical results indicate that the designed CNC Micro Center is stable at 3000-3600 rpm of spindle, which is commonly used range of rpm in this machine. The structual deformation has been reduced from 74㎜ to 0.3㎛.
趙成山,朴福萬 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-
Abstract -It bas been performed in three different methods which are 3D, 2D modeling analysis and the categorizing analysis to find the rational structure analysis of the Korean traditional wood building with selecting Buseoksa Muryangsujeon. As a result of this study, the 3D modeling analysis is more accurate analysis method. But, in complex construction, it is very difficult in the process of modeling, and may be seen different behavior from the 3D analysis in the case of earthquake. Therefore the main girder, especially Daeryang, needs to be checked by the categorized analysis. Every member stress except Chobang came out below allowable stress.