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오준철(Jun-Chul Oh),김대은(Dae-Eun Kim),김현준(Hyun-Jun Kim),김문환(Mun-Hwan Kim),김춘일(Chun-Il Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
O-rings are commonly used in machines as a seal. Due to prolonged use the surface of an O-ring can degrade which can lead to leakage as well as contamination. Damage of O-rings used in vacuum applications such as sputter is caused by various mechanisms. Particles detached from the O-ring may cause significant problems on the performance of the system in the vacuum chamber. Therefore, understanding the tribological behavior of O-rings is important to tackle the damage caused by repeated contact. In this work, FKM rubber was used for friction and wear tests conducted to investigate the tribological behavior of O-rings. A reciprocating type of a tribo-tester was used for the tests. The friction coefficient between the steel ball and the FKM specimen was quite high. Also, in order to identify the wear behavior, the surface of the FKM specimen was characterized using both optical and scanning electron microscopes. Evidence of wear due to adhesion and extrusion could be found. The results of this work will aid in improving the durability of O-rings.
오준철(Jun-Chul Oh),김대은(Dae-Eun Kim),김현준(Hyun-Jun Kim),김문환(Mun-Hwan Kim),김춘일(Chun-Il Kim) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.10
O-rings are commonly used in machines as a seal. Due to prolonged use the surface of an O-ring can degrade which can lead to leakage as well as contamination. Damage of O-rings used in vacuum applications such as sputter is caused by various mechanisms. Particles detached from the O-ring may cause significant problems on the performance of the system in the vacuum chamber. Therefore, understanding the tribological behavior of O-rings is important to tackle the damage caused by repeated contact. In this work, FKM rubber was used for friction and wear tests conducted to investigate the tribological behavior of O-rings. A reciprocating type of a tribo-tester was used for the tests. The friction coefficient between the steel ball and the FKM specimen was quite high. Also, in order to identify the wear behavior, the surface of the FKM specimen was characterized using both optical and scanning electron microscopes. Evidence of wear due to adhesion and extrusion could be found. The results of this work will aid in improving the durability of O-rings.
고에너지 전자빔 투사를 이용한 TiC, TiB<sub>2</sub> 및 VC/ 탄소강 표면합금화 연구
유정훈,신기삼,윤재홍,이찬규,허성강,이재현,오준철,이성학,어광준,Yoo, Jung-Hoon,Shin, Kee-Sam,Yoon, Jae-Hong,Lee, Chan-Gyu,Hur, Sung-Gang,Lee, Je-Hyun,Oh, Jun-Chul,Lee, Sung-Hak,Euk, Kwang-Jun 한국재료학회 2002 한국재료학회지 Vol.12 No.12
Surface alloying using TiC, $TiB_2$ and VC ceramic particles on carbon steel has been performed using high voltage electron beam. Each type of ceramic particles was mixed with flux of Al and $MgF_2$ in 1 to 4 ratio. The microstructures of the surface alloyed layers consisted of melted region, interface region. heat affected region and the unaffected matrix. The surface layer of the TiC surface alloyed had a cubed primary and a eutectic type of TiC. $TiB_2$ in surface layer of $TiB_2$ surface alloyed were incompletely melted with$ TiB_2$ particles as observed before the alloying. On the surface layer of the VC surface alloyed, very well defined cell structure was observed with VC on the cell boundary. In addition, ~50 nm in diameter VC particles in high density were ubiquitous in the matrix. Those fine VC particles prominently improved the hardness and wear resistance of the surface layer of the VC surface alloyed.