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미끄럼 마찰시 생성되는 고탄소강의 열변형층이 트라이볼로지 특성에 미치는 영향
이성애(Sungae Lee),조대현(Daehyun Cho),이영제(Youngze Lee) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
There have been many studies about white layers generated in various manufacturing processes such as hard turning, grinding, reaming. There are two different opinions on its wear characteristics. It is considered to be tribological adventage in some instance, but should decrease wear resistance because of forming micro crack and void. In this study, Ball-on-Disk type tester was used for sliding test with SUJ2 specimen due to understand the effect of white layer on friction and wear property. Surface profiler was used for investigating change of surface profiles, and transformation of micro structure was observed by FE-SEM on cross section of specimen after chemical etching.
그라파이트 박막과 DLC 박막을 증착한 디젤 엔진용 피스톤 스커트와 실린더 블록의 마찰 특성
조대현(DaeHyun Cho),이성애(SungAe Lee),이영제(YoungZe Lee) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.6
In this study friction and wear characteristics between piston skirts and cylinder bores were investigated using the reciprocating wear tester in SAE5W40 oil condition. The relative motion between a piston skirt and a cylinder liner in a real engine is considered to reciprocation wear tester. The cylinder blocks were used as reciprocation specimens, and the piston skirt samples with graphite and DLC coatings were used as fixed pin.