油润滑下水含量对DLC薄膜摩擦学性能的影响

马仲哲, 耿中荣, 王福, 陈琳

doi:10.16577/j.issn.1001-1560.2024.0256

材料保护 >

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

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

工艺篇

油润滑下水含量对DLC薄膜摩擦学性能的影响

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¹兰州交通大学机电工程学院； ²中国科学院兰州化学物理研究所固体润滑国家重点实验室

耿中荣(1977－)，教授，主要研究方向为材料摩擦磨损性能及纳米材料的制备及性能，E-mail: gzrong-1977＠163.com

收稿日期: 2024-04-17

修回日期: 2024-05-14

录用日期: 2024-05-22

网络出版日期: 2024-12-23

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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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摘要

类金刚石(DLC) 薄膜已被广泛应用于发动机核心部件的摩擦学防护。为了研究在发动机运行工况下水含量对DLC 薄膜摩擦学性能的影响，本研究以水-PAO6 混合乳液为润滑剂，考察了发动机中广泛使用的2 种DLC 薄膜(a-C 薄膜和a-C:H 薄膜)在不同温度下的摩擦磨损性能。结果表明:在水- PAO6 混合乳液的润滑条件下，摩擦系数受含水量的影响较小，总体上存在小幅增加。a-C 薄膜部分失效，而a-C:H 薄膜尚未出现基底暴露现象，2 种薄膜的磨损率随着含水量的增加而降低。表面分析表明，水含量的增加抑制了二硫代氨基甲酸钼(MoDTC)的降解过程，从而减少了润滑添加剂MoS2的形成。此外，水含量的升高还促进了碳向对偶球表面的转移。碳质转移膜、MoS2和铁氧化物的共同作用影响了DLC 薄膜的摩擦学行为。

关键词： DLC 薄膜; 油水混合乳液; 摩擦磨损性能; 摩擦化学反应

本文引用格式

马仲哲, 耿中荣, 王福, 陈琳 . 油润滑下水含量对DLC薄膜摩擦学性能的影响[J]. 材料保护, 2024 , 57(11) : 118 -126 . DOI: 10.16577/j.issn.1001-1560.2024.0256

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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