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Wear Characteristics of Cylinder-Liner Materials for Diesel Engine at Elevated Temperature

디젤엔진용 실린더 라이너 소재의 고온 마모특성

  • Received : 2015.03.31
  • Accepted : 2015.09.07
  • Published : 2015.11.01

Abstract

In a diesel engine, the wear of the cylinder liner occurs because of the continuous reciprocating motion of the piston ring. This wear reduces the performance of the diesel engine and shortens its service life. This study evaluated the wear characteristics of GT metal and a conventional metal used for cylinder liners using a ship's diesel engine. Wear tests were performed at temperatures of $25^{\circ}C$, $175^{\circ}C$, and $325^{\circ}C$, and under loads of 10 N, 30 N, and 50 N. The amount of wear, specific wear rate, and friction coefficient were evaluated for each condition. To analyze the wear mechanism, observations were made on an SEM. In the case of both metals, abrasive and adhesion wear occurred on the wear surfaces at room temperature, and corrosion wear was observed at high temperatures. The amount of wear and the specific wear rate of the GT metal were lower than those of the conventional metal at all temperatures, and hence it can be concluded that the wear characteristics of the GT metal are much better.

선박 디젤엔진용 실린더 라이너는 피스톤 링과 지속적인 왕복운동을 통해 마모가 발생한다. 마모는 디젤엔진의 성능을 저하시키고, 사용 수명을 단축시킨다. 본 논문은 선박 디젤엔진용 실린더 라이너의 GT 금속 및 기존 금속에 대하여 마모특성을 평가하였다. 마모시험은 상온, $175^{\circ}C$, $325^{\circ}C$의 온도조건과 10 N, 30 N, 50 N 의 하중조건에서 수행되었으며, 마모량, 비마마율 및 마찰계수를 평가하였다. 또한 각 조건에 대한 마모메커니즘을 분석하기 위해서 SEM 분석을 수행하였다. 두 금속 공히, 상온에서 연삭 및 응착마모가 진행되었고, 고온에서 부식마모가 발견되었다. GT 금속은 기존 금속 대비 모든 온도 범위에서 마모량 및 비마모율이 작고 마모특성이 더 우수하다.

Keywords

References

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