Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Development of Mathematical Model to Predict Specific Wear Rates of Graphite Seal

흑연 씰의 비마모율 예측에 관한 수학적 모델 개발

  • Kim, Yeonwook (School of Mechanical Design Engineering, Chungnam National University) ;
  • Kim, Jaehoon (School of Mechanical Design Engineering, Chungnam National University) ;
  • Park, Sunghan (Advanced Propulsion Technology Center, Agency for Defense Development) ;
  • Lee, Hwangyu (Advanced Propulsion Technology Center, Agency for Defense Development) ;
  • Kim, Beomkeun (Department of Mechanical & Automotive Engineering, Inje University) ;
  • Lee, Seongbeom (Department of Mechanical & Automotive Engineering, Inje University) ;
  • Kwak, Jae Su (Department of Aerospace & Mechanical Engineering, Korea Aerospace University)
  • Received : 2013.12.09
  • Accepted : 2014.07.09
  • Published : 2014.08.01
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Abstract

The dry sliding wear behavior of graphite that is used as the sealing material to cut off hot gas was evaluated as a function of applied load, sliding speed and temperature. The reciprocating wear tests were carried out at room temperature and elevated temperatures. An attempt has been made to develop a mathematical model by response surface methodology and an analysis of variance technique was applied to confirm the validity of the developed model. Also, the wear mechanism was compared through the observation of the worn surface by SEM analysis.

고온고압의 밸브에서 연소가스의 유입을 방지하는 흑연 씰은 밸브 축의 구동으로 인한 마찰 및 마모에 노출된다. 흑연 씰의 마모로 인해 고온 가스 제어가 불가능해지기 때문에 씰의 마모 특성을 예측하는 것은 매우 중요하다. 본 논문은 비마모율을 마모 특성에 대한 척도로 설정하고 접촉하중, 미끄럼 속도, 온도 등을 변수로 하여 흑연의 왕복동 마모 시험을 수행하였다. 반응표면분석법에 근거하여 실험계획을 정립하고 시험 결과에 대하여 분산분석법을 통하여 유효한 수학적 모델을 제시하였다. 또한, 마모된 표면의 SEM 분석을 통해 특정 조건에서의 마모 메커니즘을 분석하고 비교하였다.

Keywords

References

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