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Effect of diamond-like carbon films on the bearing steel surface mechanical properties and rolling contact fatigue life |
LIU Hongxi1; JIANG Yehua1; ZHOU Rong1; ZHAN Zhaolin1; TANG Baoyin2 |
1.School of Mechanical and Electrical Engineering; Kunming University of Science and Technology; Kunming 650093
2.State Key Laboratory of Advanced Welding Production Technology; Harbin Institute of Technology; Harbin 150001 |
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Cite this article:
LIU Hongxi JIANG Yehua ZHOU Rong ZHAN Zhaolin TANG Baoyin. Effect of diamond-like carbon films on the bearing steel surface mechanical properties and rolling contact fatigue life. Chin J Mater Res, 2009, 23(1): 43-48.
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Abstract Microstructure and properties of plasma immersion ion implantation and deposition (PIII&D) diamond-like carbon (DLC) films on bearing steel substrate were investigated. PIII&D DLC consists of a mixture of amorphous and crystalline phases, with a variable ratio of sp2/sp3 carbon bonds, and the sp3 bonds content more than 10%. The DLC film has extremely smooth area, good adhesion, high uniformity and efficiency of space filling over large areas. The nanohardness (H) and the elastic modulus (E) of DLC films measurement indicates that the maximum H(E) value is 40 GPa (430 GPa), increases by 263.6% (95.5%). The friction and wear behaviors and rolling contact fatigue (RCF) life of these samples have also been investigated by ball-on-disc and three-ball-rod fatigue testers. Results show that the friction coefficient decrease from 0.87 to 0.2; the L10 L50 La and mean life L of treated sample in 90% confidence level increases by 10.1, 4.2, 3.5 and 3.4 times, respectively. The RCF life scatter extent of treated samples is improved significantly.
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Received: 22 February 2008
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Fund: Supported by National Natural Science Foundation of China, No.50665004. |
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