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Friction and Wear Characteristics of Magneto-rheological Fluid Depend on Surface Coated by DLC and PTFE
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  • Journal title : Tribology and Lubricants
  • Volume 31, Issue 2,  2015, pp.62-68
  • Publisher : The Korean Society of Tribologists and Lubrication Engineers
  • DOI : 10.9725/kstle.2015.31.2.62
 Title & Authors
Friction and Wear Characteristics of Magneto-rheological Fluid Depend on Surface Coated by DLC and PTFE
Zhang, Peng; Lee, Kwang-Hee; Lee, Chul-Hee; Choi, JongMyong;
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A magnetorheological (MR) fluid is a smart material whose rheological behavior can be controlled by varying the parameters of the applied magnetic field. Because the damping force and shear force of an MR fluid can be controlled using a magnetic field, it is widely employed in many industrial applications, such as in vehicle vibration control, powertrains, high-precision grinding processes, valves, and seals. However, the characteristics of friction caused by iron particles inside the MR fluid need to be understood and improved so that it can be used in practical applications. Surface process technologies such as polytetrafluoroethylene (PTFE) coatings and diamond-like carbon (DLC) coatings are widely used to improve the surface friction properties. This study examines the friction characteristics of an MR fluid with different surface process technologies such as PTFE coatings and DLC coatings, by using a reciprocating friction tester. The coefficients of friction are in the following descending order: MR fluid without any coating, MR fluid with a DLC coating, and MR fluid with a PTFE coating. Scanning electron microscopy is used to observe the worn surfaces before and after the experiment. In addition, energy dispersive X-ray spectroscopy is used to analyze the chemical composition of the worn surface. Through a comparison of the results, the friction characteristics of the MR fluid based on the different coating technologies are analyzed.
MR fluid;friction characteristics;surface coating;DLC;PTFE;magnetic field;
 Cited by
DLC (ta-C) 후막코팅을 위한 트라이볼로지 코팅 연구,장영준;강용진;김기택;김종국;

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