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Oxygen 함량에 따른 Cr-O-N 코팅막의 미세구조 및 기계적 특성에 관한 연구
윤준서(Jun Seo Yun),권세훈(Se Hun Kwon),박인욱(In-Wook Park),이정두(Jeong Du Lee),김광호(Kwang Ho Kim) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.5
Cr-O-N coatings having different oxygen contents were deposited on Si wafer and SUS 304 substrates by an arc ion plating technique using Cr target in Ar/O₂/N₂ gaseous atmosphere. As increasing oxygen content in the coating, the microstructure of Cr-O-N coating changed from polycrystalline having NaCl structure to amorphous structure. Further increase of oxygen content resulted in phase transformation from amorphous to rhombohedral structure. From the variations of d value and average grain size, it was revealed that the maximum solubility of oxygen in Cr-O-N coating was about 21 at.%. And the maximum micro-hardness of 2751HK was obtained in this composition. The lowest friction coefficient was measured in the coating having 34.8 at.% of oxygen. However, more narrow width of wear track was found in the coating having 30.1 at.% of oxygen.
A Study on the Combustion Characteristics of MCFC Offgas Catalytic Combustors
이상민(Lee, Sang Min),이연화(Lee, Younhwa),안국영(Ahn, Kook Young),박인욱(Park, In-Wook) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Anode off-gas of high temperature fuel cells such as MCFC still contain combustible components such as hydrogen, carbon monoxide and hydrocarbon. Thus, it's very important to fully burn anode off-gas and use the generated heat in order to increase system efficiency. In the present study, catalytic combustors have been applied to high temperature MCFC system so that the combustion of anode-off gas can be boosted up. Since the performance of catalytic combustor directly depends on the combustion catalyst, this study has been focused on the experimental investigation on the combustion characteristics of multiple commercial catalysts having different structures and compositions. In order to determine the design conditions of the catalytic combustor, parameters such as inlet temperature, space velocity and excess air ratio have been varied and optimized for combustor design. Results show that H₂ in off-gas assists CH₄ combustion in a way that it decreases minimum inlet temperature limit and increases maximum space velocity while keeping high fuel conversion efficiency.
철근 콘크리트 구조 전자파 차폐 벽체에 대한 성능측정 시스템 연구
김보현(Bo-Hyun Kim),조경용(Kyeong-Yong Cho),박인욱(In-Wook Park),오재현(Jae-Hyun Oh),이상훈(Sang-Hoon Lee) 한국건설순환자원학회 2021 한국건설순환자원학회 논문집 Vol.9 No.4
본 논문에서는 철근 콘크리트 구조 벽체에 대한 전자파 차폐성능 측정시스템을 이용한 전자파 투과율을 분석하였다. 최근 철근 콘크리트 벽체 조건에 대한 전자파 차폐 기술이 연구되고 있으며, 단위 셀 크기의 시험시편에 대한 차폐 성능 시험이 진행되고 있다. 그러나, 단위셀 크기의 시험은 차폐성능 측정범위가 부족하고, 실제 콘크리트 벽체 조건을 반영하기 어렵다는 문제점을 가지고 있다. 이에 대하여 실제 벽체와 유사한 크기와 구조의 2.2m x 2.2m 크기의 대형 벽체 시험시편을 측정할 수 있는 차폐성능 측정 시스템을 구성하였다. 측정 시스템 검증을 위하여 일반 철근 콘크리트 시험시편을 선정하여 실제 차폐성능 측정과 수치해석을 진행하였다. 평가 주파수 범위인 75MHz∼2GHz에서 시험결과와 수치해석 결과가 서로 유사한 경향성을 보임이 확인되어 본 차폐성능 측정 시스템이 유효함을 검증하였다. In this paper, the electromagnetic wave transmittance of the reinforced concrete structure wall was analyzed using the performance measurement system of electromagnetic wave shielding. Recently, electromagnetic wave shielding technologies on the reinforced concrete wall conditions have been studied, and the shielding effectiveness have been tested on unit cell size. However, the unit cell size tests have problems on that the measurement range for shielding performance is insufficient and it is difficult to reflect the real conditions of the concrete wall. Therefore, we constructed a shielding performance measurement system using a large sample of 2.2m x 2.2m like a real wall. To verify the measurement system, general reinforced concrete test samples were selected, and real shielding performance measurements and numerical analysis were proceeded. Test and numerical analysis results showed similar tendencies in the evaluation frequency range of 75MHz to 2GHz. Thus we validated the effectiveness of this shielding performance measurement system.
DC 펄스 마그네트론 스퍼터링으로 증착된 TiO₂ 박막의 특성변화에 관한 연구
안은솔(Eunsol An),허성보(Sung-Bo Heo),김규식(Kyu-Sik Kim),정우창(Uoo Chang Jung),박용호(Yong Ho Park),박인욱(In-Wook Park) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.2
This study reports a fabrication of TiO₂ on the surface of dental implants by pulsed d.c. magnetron sputtering from a Ti target. A systematic investigation on the microstructure and mechanical properties of TiO₂ films was carried out with the variation of O₂ contents and substrate temperatures. The effects of deposition parameters on the fabricated structures were investigated by X-ray diffraction (XRD) technique and field emission scanning electron microscope (FE-SEM). Hydrophilic properties were evaluated by measuring water contact angles on the film surface. With increasing O₂ contents up to 40%, surface roughness of TiO₂ film increased while relatively smooth surface was obtained with 50% O₂ contents. Surface roughness and adhesion strength both increased as substrate temperature increased up to 200°C. From these results, hydrophilic and adhesive properties of the present TiO₂ films synthesized with 40% O₂ at 200°C are regarded to be suitable for biocompatible applications.