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Cu-C-Fe₃O₄-Sn 소결 마찰재의 첨가물이 미세구조와 마찰특성에 미치는 영향
최석의(Seok Eui CHOI),함효균(Hyo Kyun HAM),오용택(Yong Taeg OH),최희범(Hee Bum CHOI),김향래(Hang Rae KIM),최형기(Hyung Gi CHOI),이현규(Hyun Kyu LEE),신동찬(Dong Chan SHIN) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
The effects of zircon silicate (ZrSiO₄), Zinc oxide (ZrO₂), and Alumina (Al₂O₃), silicon carbide (SiC) as additives on the microstructure and tribological properties of sintered Cu-C-Fe₃O₄-Sn for racing car application have been studied. All the specimens were sintered at 750℃ for 30 min. The abrasive characteristics was tested on a 1/5 scale dynamometer. Effectiveness, fade & recovery, and noise tests were carried out to analyze the friction characteristics. The sintered specimens showed better abrasive properties in the order of ZrSiO₄ < ZrO₂ < Al₂O₃ < SiC. In the best additive of SiC, the friction coefficient was found to be 0.482 and showed less than 10% degradation during life time test at 100 Ian and 130 ㎞.
Cu-Sn 소결 마찰재에 C와 Cu 함량이 마찰특성에 미치는 영향
함효균(Hyo Kyun HAM),최석의(Seok Eui CHOI),오용택(Yong Taeg OH),최희범(Hee Bum CHOI),김향래(Hang Rae KIM),최형기(Hyung Gi CHOI),이현규(Hyun Kyu LEE),신동찬(Dong Chan SHIN) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
We have investigated the effects of graphite and cupper contents on the tribological properties of Cu-Sn sintered friction materials. The base materials used was Cu-Sn alloy. We varied graphite contents from 20 to 30 vol% with an interval of 5% and Cu contents of 25 and 35 vol%. All the specimens were sintered for 30 min at 750℃, nitrogen atmosphere by hot press method. Their friction and abrasive characteristics was evaluated by 1/5 Scale dynamometer. When the Cu content is decreased, we can get higher friction coefficient and less abrasion. The lowest abrasion was obtained at the condition of 30 vol% graphite. The highest friction coefficient was obtained in the specimen of 20 vol% graphite.
김기현 ( Kim Ki-hyun ),최세원 ( Choi Se-won ),박세연 ( Park Se-yeon ),오용택 ( Oh Yong-taeg ),신동찬 ( Shin Dong-chan ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.3
We investigated thermostability of imidazolium based ionic liquids according to temperature and atmosphere. Mass variation of the ionic liquid corresponding to the temperature was analyzed by thermogravimetric analyzer(TGA). Imidazolium based ionic liquids of [C2mim][TFSI], [C8mim][TFSI], [C12mim][TFSI], which have different alkyl chain length, were used. The color change was evaluated by UV-visible spectrophotometer. The structure change was verified by pH measurements. As the temperature and oxygen concentration increase, the color of the ionic liquid turns to dark brown. The pH number was lowered according to color darkening. [C8mim][TFSI] showed faster color change compared to [C2mim][TFSI]. Color change of [C12mim][TFSI] was slower and to light brown despite long alkyl chain than [C8mim][TFSI]. The color change is strongly related to the thermal stability. Coulombic packing by symmetry affects the thermal stability larger than Van der Waals force generated by the alkyl chain.
용액법을 이용한 [C12mim][TFSI] 용매에서의 Alq3 결정 성장 메커니즘
박세연 ( Se Yeon Park ),최세원 ( Se Won Choi ),오용택 ( Yong Taeg Oh ),신동찬 ( Dong Chan Shin ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.2
The organic semiconductor is promising material for flexible electronics due to many advantages such as simple manufacturing process, inexpensive, and flexibility. The high purity single crystal of the organic semiconductor, however, is not easily obtained and thus degradation of electrical property is a big hurdle for organic electronics applications. We have investigated the growth mechanism of Alq3 single-crystal using a [C12mim][TFSI] ionic liquid as a solvent. Isothermal heat-treatment has been carried out at 100℃ for 1h, 3h, 24h, and 120h with 9 mol% composition. We can make high quality single crystal of Alq3 via just one time process using ionic liquid. The shape of Alq3 single-crystal changes from hollow structure to filled hexagonal-rod shape. Now we are trying to measure the electrical properties of the Alq3 single crystal. Our research could be promising process to improve electrical properties of organic semiconductor such as Organic Light Emitting Diode (OLED), Organic Thin Film Transistor (OTFT), and Organic Solar Cell.