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[재료] PTA법에 의한 TiC 표면강화 알루미늉 Brake Disc의 제조 및 성능평가에 관한 연구
유승을(Seungeul Yoo),민준원(Joonwon Min) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
Surface hardening of AC4C aluminium alloy brake disc with TiC powders was obtained by PTA(Plasma Transferred Arc) method. Machinability of the hardfaced area was tested with PCD (Poly Crystalline Diamond) and tungsten carbide tools. Dry, wet, and suction conditions were tested during machining. The flank wears of the tools were compared according to the machining conditions and the tool materials. The performance of TiC hard faced aluminium alloy brake disc was tested by brake dynamometer. The values of brake factor were in the range of 0.261-0.329, and the wear of brake disc was below 0.012 mm in thickness after dynamotest.
플라즈마 용사에 의해 제조한 AI-SiCp 복합재료 코팅층에서 마찰특성의 온도 의존성
민준원(Joonwon Min),유승을(Seungeul Yoo) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
AI-SiCp composite layer was prepared by plasma thermal spray on aluminum substrate. The homogeneously dispersed composite powder for thermal spray was fabricated by mechanical alloying with ball mill. Composite layers were coated over 800㎛ in thickness.<br/> Friction tests of composite layers and commercial aluminum alloys for comparison were performed in the temperature range of 20~260℃ with the interval of 40℃ with steel counter-face. Friction coefficient was recorded during test sequence, and the microstructure of surface and cross-section of wear tested region was investigated by optical and scanning electron lnicroscope.<br/> Friction coefficients at room temperature were similar in most specimens except pure aluminum, but as the temperature increase, friction coefficient was increased rapidly in the sequence of AC4C, AC2A, and Al-SiCp composite layer. Consequently, the reinforcement of SiC particle into aluminum matrix increased the stability of friction coefficient as well as wear resistance.
윤영식(Youngsik Yoon),유승을(Seungeul Yoo),한범석(Beomsuk Han) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Friction and wear characteristics of two different automotive brake drum materials; conventional cast iron and AI-MMC, were experimentally studied. Friction stability and changes in temperature and torque during drags and stops test were measured by inertial brake dynamometer and wear test system. Brake dynamometer was used to obtain the amount of wear. And wear surfaces were observed by SEM and analyzed by XRD. Also the changes in friction coefficients, temperature and torque were measured by wear test setups under various load conditions. In this study, AI-MMC was shown to be more stable than cast iron in changes of temperature, friction coefficient and torque values; these experiments have been done under various sliding speed or load conditions.
PTA법에 의한 TiC분말 표면강화 AI합금층의 제조 및 마모특성에 관한 연구
민준원(Joonwon Min),유승을(Seungeul Yoo) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.9
Surface hardening of AC4C aluminium alloy with TiC powders was obtained by plasma transferred arc (PT A) method. Bead appearance, microstructure and wear behavior were characterized in relation to the torch current, powder feed rate and wear condition. The width and the depth of bead were mainly increased with increasing torch current. The comparision of wear behavior between AC4C alloy and PT A treated AC4C alloy showed the remarkable enhancement of wear resistance.
박종혁(Jonghyuck Park),민준원(Joonwon Min),유승을(Seungeul Yoo),최정운(Jungwoon Choi),최우석(Wooseok Choi),김시동(Sidong Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Along with increasing awareness of the indoor air quality, the problem of removing gaseous pollutants and smell inside of vehicle has become more important than ever. Volatile organic compound (VOC) generated from inside of vehicles expose drivers to various kinds of diseases for a long period of time. This study analyzes photocatalyst and air purifier. Computational fluid dynamic analysis (CFD) was used to analyze photocatalyst responses and fluid in accordance with the influx of air.
PAB 모듈 적용 고분자소재의 내환경 물성 특성 변화에 관한 연구
고윤기(Younki Ko),정선경(Sunkyoung Jeoung),유승을(Seungeul Yoo),곽성복(Sungbok Kwak),김정현(Jeounghyun Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In the interior parts of the vehicle, the plastic material is popularly used in the economical and emotional aspects of passengers. The plastic component lies in the harsh environment such as high temperature, humidity variation and direct sun light. These environmental factors affect to the material characteristics and life time of plastic components in the vehicle. In this paper, the material test for the specimens made from the plastic used in the dash board in the vehicle, is carried out after aging in the various condition of temperature, humidity and ultraviolet rays. In order to investigate the aging effect on the environmental factors, the elastic modulus and stress-strain curve are obtained from the tensile tests.