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김연욱(Yeonwook Kim),김재훈(Jaehoon Kim),양호영(Hoyeong Yang),박성한(Sunghan Park),이환규(Hwankyu Lee),김범근(Bumkeun Kim),이성범(Seungbum Lee),곽재수(Jaesu Kwak) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
마모 마찰기구로 널리 사용되는 그라파이트에 대하여, 고온가스 조절 밸브 내에서 가스 유입 방지용 씰링 그라파이트 소재(HK-6)의 고온 마모거동에 대하여 연구하였다. 구동축과 라이너 사이에 위치하여 지속적인 마모의 발생을 모사하기 위해 왕복동 마모 시험을 수행하였다. 마모 거동 변화의 영향 인자로 접촉 하중, 미끄럼 속도, 온도를 설정하고 민감도를 확인하였다. 마모 발생이 가장 적고 씰링 그라파이트 소재(HK-6)의 효율이 증대되는 최적조건에 대해 논의하였다. Graphite is commonly used as a solid lubricant leading to low friction coefficient and abrasion. In this study, wear behavior of sealing graphite(HK-6) at elevated temperature was evaluated. Reciprocating wear test was carried out as wear occurred graphite as a seal(HK-6) is positioned between the liner and driving shaft. Variables which are temperature, sliding speed and contact load are set. this study suggest optimized environment conditions through the wear properties of graphite.
고온차단 기밀용 그라파이트의 고온 미끄럼마모 특성 평가
김연욱(YeonWook Kim),김재훈(JaeHoon Kim),양호영(HoYeong Yang),박성한(SungHan Park),이환규(HwanKyu Lee),김범근(BumKeun Kim),이성범(SeungBum Lee),곽재수(JaeSu Kwak) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.11
고온의 가스유로를 조절하는 개폐식(On-Off)밸브의 구동축과 라이너 사이에 위치하여 구동장치로의 고온가스유입을 방지하는 기밀 소재에 대하여 연구하였다. 기밀 소재로 사용된 그라파이트(Graphite)는 구동장치에 의한 구동축의 지속적인 움직임으로 인해 마모가 발생한다. 본 논문은 고온가스 조절 밸브 내의 기밀 소재로 사용된 그라파이트(Graphite, HK-6)에 대한 상ㆍ고온 마모 특성을 평가하였다. 구동축의 소재인 레늄합금(W-25Re)에 대하여 그라파이트의 마모 시험을 수행하고 마찰계수와 비마모율을 비교하였다. 상온과 실제 작동 환경인 고온 485℃에서 미끄럼속도와 접촉하중의 변화에 따른 마찰계수와 비마모율을 평가하였다. 마모표면의 SEM분석을 통하여 상ㆍ고온 마모표면에 관찰되는 third body 를 확인하고 이로 인한 윤활효과를 고찰하였다. Sealing structure to prevent flowing hot gas into the driving device, located between the driving shaft and the liner of On-Off valve for controlling the hot gas flow path was studied. Wear occurs due to the constant movement of the driving shaft controlled by actuator on graphite as the sealing material. In this paper, the dynamic wear behavior in high temperature of graphite(HK-6) to be used as sealing material was evaluated. Reciprocating wear test was carried out for the graphite(HK-6) to the relative motion between shaft materials(W-25Re). The results of friction coefficient and specific wear rate according to contact load, sliding speed at room temperature and 485℃ considering the actual operating environment were evaluated. Through the SEM analysis of the worn surface, third body as lubricant films were observed and lubricant effect of third body was considered.
김연욱(Yeonwook Kim),김재훈(Jaehoon Kim),양호영(Hoyoung Yang),박성한(Sunghan Park),이환규(Hwankyu Lee),김범근(Bumkeun Kim),이성범(Seungbum Lee),곽재수(Jaesu Kwak) 한국추진공학회 2013 한국추진공학회지 Vol.17 No.5
Graphite is commonly used as a solid lubricant leading to low friction coefficient and abrasion. In this study, wear behavior of sealing graphite(HK-6) at elevated temperature was evaluated. Reciprocating wear test was carried out as wear occurred graphite as a seal(HK-6) is positioned between the liner and driving shaft. Variables which are temperature, sliding speed and contact load are set. This study suggest optimized environment conditions through the wear properties of graphite.
고체윤활 Graphite 소재의 마모 특성에 관한 연구
양호영(Hoyoung Yang),김재훈(Jaehoon Kim),김연욱(Yeonwook Kim),하재석(Jaeseok Ha),박성한(Sunghan Park),이환규(Hwankyu Lee) 한국추진공학회 2013 한국추진공학회지 Vol.17 No.5
The important design factors for designing solid lubricating of dynamic seal are tightness, wear resistance and lubricant films. In this study, the effect factors influenced solid lubricating roperties of the graphite were analyzed and wear behaviour caused for various test conditions was compared with results obtained from reciprocating wear tests. Also the optimal conditions for formation of lubricant films were investigate to evaluate wear properties of graphite materials. The repeated procedure for the formation of wear particles and lubricant films, and the dissipation of lubricant films was estimated the wear mechanisms with changes of wear depth. Therefore the lubricant film of graphite seal was generated by adhesion of wear particles on the worn surface and it was very useful in wear characteristics.
양호영(Ho-Young Yang),김재훈(Jaehoon Kim),하재석(Jaeseok Ha),김연욱(YeonWook Kim),박성한(Sunghan Park),이환규(Hwankyu Lee) 한국추진공학회 2013 한국추진공학회지 Vol.17 No.3
The graphites as airtight structure seals prevent high-pressure and high-temperature gas from flowing into actuator of propulsion system and generate lubricant film during wear procedure to assist lubricant and sealing. In this study, the tribological characteristics of the graphite in high-temperature are evaluated. In order to evaluate the tribological characteristics of high density graphite(HK-6), variables which are temperature, sliding speed and contact load are set. this study suggest optimized environment conditions through the wear properties of graphite. Consequeantly, high temperature is better than at room temperature to generate lubricant film, so that friction coefficient of graphite is lower at high temperature than at room temperature.