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Diamond-like carbon (DLC) and graphite-like carbon (GLC) coatings have good prospects for improving the surface properties of engine parts. However, further understanding is needed on the effect of working conditions on tribological behaviors. In this study, GLC and two types of DLC coatings were deposited on GCr15 substrate for investigation. The friction and wear properties of self-mated and steel-mated pairs were evaluated. Two temperatures (25 and 90 ℃), three lubrication conditions (base oil, molybdenum dithiocarbamate (MoDTC)-containing oil, MoDTC+zinc dialkyldithiophosphate (ZDDP)-containing oil), and high Hertz contact stress (2.41 GPa) were applied in the experiments. The results showed that high temperature promoted the effect of ZDDP on steel-mated pairs, but increased wear under base oil lubrication. The increased wear for steel-mated pairs lubricated by MoDTC-containing oil was due to abrasive wear probably caused by MoO3 and β-FeMoO4. It was also found that in most cases, the tribological properties of self-mated pairs were better than those of steel-mated pairs.


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Effect of temperature and mating pair on tribological properties of DLC and GLC coatings under high pressure lubricated by MoDTC and ZDDP

Show Author's information Kang LIU1Jia-jie KANG1,2,3( )Guang-an ZHANG4( )Zhi-bin LU4Wen YUE1,2,3
School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China
Key Laboratory of Deep GeoDrilling Technology of Ministry of Natural Resources, Beijing 100083, China
Zhengzhou Institute, China University of Geosciences (Beijing), Zhengzhou 451283, China
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

Abstract

Diamond-like carbon (DLC) and graphite-like carbon (GLC) coatings have good prospects for improving the surface properties of engine parts. However, further understanding is needed on the effect of working conditions on tribological behaviors. In this study, GLC and two types of DLC coatings were deposited on GCr15 substrate for investigation. The friction and wear properties of self-mated and steel-mated pairs were evaluated. Two temperatures (25 and 90 ℃), three lubrication conditions (base oil, molybdenum dithiocarbamate (MoDTC)-containing oil, MoDTC+zinc dialkyldithiophosphate (ZDDP)-containing oil), and high Hertz contact stress (2.41 GPa) were applied in the experiments. The results showed that high temperature promoted the effect of ZDDP on steel-mated pairs, but increased wear under base oil lubrication. The increased wear for steel-mated pairs lubricated by MoDTC-containing oil was due to abrasive wear probably caused by MoO3 and β-FeMoO4. It was also found that in most cases, the tribological properties of self-mated pairs were better than those of steel-mated pairs.

Keywords: temperature, diamond-like carbon (DLC), graphite-like carbon (GLC), mating pair, oil additives

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Publication history

Received: 02 March 2020
Revised: 05 May 2020
Accepted: 14 June 2020
Published: 23 November 2020
Issue date: December 2021

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© The author(s) 2020

Acknowledgements

This work was supported by the Beijing Municipal Natural Science Foundation (3182032), the National Natural Science Foundation of China (41772389), the Pre-Research Program in National 13th Five-Year Plan (61409230603), and Joint Fund of Ministry of Education for Pre-research of Equipment for Young Personnel Project (6141A02033120).

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