• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집A
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• pp.151-156
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• 2001

Experimental frictional and wear characteristics of silicon graphite materials is studied in this paper. Those specimens are lubricated with high temperature and highly pressurized water to simulate the same operating condition for the journal bearing and the thrust bearing on the main coolant pump bearing in the newly developing nuclear reactor named SMART(System-integrated Modular Advanced ReacTor). Operating condition of the bearings is realized by the tribometer and the autoclave. Friction coefficient and wear loss are analyzed to choose the best silicon graphite material. Pin on plate test specimens are used and coned disk springs are used to control the applied force on the specimens. Wear loss ana wear width are measured by a precision balance and a micrometer. The friction force is measured by the strain gauge which can be used under high temperature and high pressure. Three kinds of silicon graphite materials are examined and compared with each other, and each material shows similar but different results on frictional and wear characteristics.

• Tribology and Lubricants
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• 제25권5호
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• pp.330-334
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• 2009

Hydraulic servo cylinders have been used to control accurately a large machine in power plant. Especially, Piston head and bush of servo cylinder is assembled sleeve and piston head and bush made of Cu alloy and pad sealing part. A damages of sleeve and piston head, bush are caused by friction and wear. Thus, It is necessary to examine friction and wear characteristics of Cu alloys for the piston head and bush. In this study, to be reliable on the piston and cylinder parts, dry friction and wear experiments were carried out with Cu alloys of four kinds of AlBC, PBC, BC and BS using reciprocating friction tester of pin on disk type. From this study, the result was shown that the AlBC and PBC with alloy elements were excellent to resistance wear. As the sliding speed was increased, the wear loss of PBC decreased than another Cu alloy.

• 대한기계학회논문집A
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• 제40권10호
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• pp.873-878
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• 2016

컨트롤 밸브용 SCM415강은 밸브케이스와 밸브의 지속적인 운동을 통해 마멸이 발생한다. 마멸은 밸브의 성능을 저하시키고, 사용 수명을 단축시킨다. 본 논문은 컨트롤 밸브용 모재 및 침탄 처리된 SCM415강에 대하여 마멸 특성을 평가하였다. 마멸 시험은 다양한 온도 및 하중에서 왕복동 마모시험기를 이용하여 수행되었으며, 마멸량, 비마멸율 및 마찰계수를 분석하였다. 마멸 메커니즘은 SEM을 통하여 분석하였다. 마멸량에 대한 하중과 온도의 교호작용은 MINITAB을 이용한 분산분석을 수행하였다.