Effect of Water Content on the Tribological Performance of DLC Films under Oil Lubrication

MA Zhongzhe, GENG Zhongrong, WANG Fu, CHEN Lin

doi:10.16577/j.issn.1001-1560.2024.0256

Materials Protection >

2024 , Vol. 57 >Issue 11: 118 - 126

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0256

Effect of Water Content on the Tribological Performance of DLC Films under Oil Lubrication

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(1.School of Mechonicol ond Electricol Engineering，Lanzhou Jiaotong University，Lanzhou 730070，China；2.State Key Laboratory of Solid Lubrication，Lanzhou Institute of Chemical Physics，Chinese Academy of Sciences，Lanzhou，730030，China)

GENG Zhongrong (1977－ )，Professor，Research Focus: the Study of Material Friction and Wear Properties，as well as the Preparation and Performance Research of Nanomaterials，E-mail: gzrong-1977＠163.com

Received date: 2024-04-17

Revised date: 2024-05-14

Accepted date: 2024-05-22

Online published: 2024-12-23

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Abstract

Diamond-like carbon (DLC) films have been extensively applied in tribological protection of core components in engines.In order to investigate the effect of water content on the tribological properties of DLC films under engine operating conditions，a water-PAO6 emulsion was used as the lubricant to examine the friction and wear behavior of two types of DLC films commonly applied in engines (a-C and a-C:H films) at different temperatures.Results showed that under the lubrication conditions of the water-PAO6 emulsion，the friction coefficient was slightly influenced by the water content，showing a minor overall increase.Partial failure occurred in the a-C films，whereas no substrate exposure was observed in the a-C:H films.The wear rates of both films decreased with the increase in water content.Surface analysis revealed that the increase in water content inhibited the degradation of molybdenum dithiocarbamate (MoDTC)，thereby reducing the formation of the lubricant additive MoS2.Moreover，the rise in water content promoted the transfer of carbon to the counter-ball surface.The combined effects of the carbon transfer film，MoS2 and iron oxides influenced the tribological behavior of the DLC films.

Key words： DLC films; water-oil emulsion; friction and wear property; tribo-chemical reaction

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MA Zhongzhe, GENG Zhongrong, WANG Fu, CHEN Lin . Effect of Water Content on the Tribological Performance of DLC Films under Oil Lubrication[J]. Materials Protection, 2024 , 57(11) : 118 -126 . DOI: 10.16577/j.issn.1001-1560.2024.0256

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