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Tribolgical Characteristics of DLC Film using Substrates with Varying Hardness  

Park, Jae-Hong (Department of Mechanical Engineering, Graduate School, Kyungpook National University)
Jang, Beom-Taek (Department of Mechanical Engineering, Graduate School, Kyungpook National University)
Kim, Seock-Sam (School of Mechanical Engineering, Kyungpook National University)
Publication Information
KSTLE International Journal / v.9, no.1_2, 2008 , pp. 31-35 More about this Journal
Abstract
DLC (Diamond Like Carbon) films have predominant tribological properties like a high hardness, low friction and high chemical resistance; therefore, DLC films are applied in a wide range of industrial fields. This paper evaluated the characteristics of DLC films deposited on bearing steel with different hardness by RF-PECVD (Radio Frequency - Plasma Enhanced Chemical Vapor Deposition) method. Si-interlayer was deposited on bearing steel to improve adhesion strength by RF-Sputtering method. The DLC film structures were analyzed with Raman spectra and Gaussian function. Adhesion strength of DLC films was measured with a scratch tester. Friction and wear test were carried out with a ball-on -disc type to investigate the tribological characteristics. Experimental results showed that DLC films deposited on bearing steel under same deposition condition have typical structure DLC films regardless of hardness of bearing steel. Adhesion strength of DLC film is increased with a hardness of bearing steel. Friction coefficient of DLC film showed lower at the high hardness of bearing steel.
Keywords
DLC film; adhesion strength; bearing steel; tribology; raman spectra; friction coefficient;
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