Microstructure and Tribological Behavior of Self-lubricating (Si:N)-DLC/MAO Coatings on AZ80 Magnesium Substrate

Wei YANG; Zhennan DENG; Dong ZHANG; Peiling KE; Aiying WANG

doi:10.1007/s40195-013-0265-y

Acta Metallurgica Sinica (English Letters) >

2013 , Vol. 26 >Issue 6: 693 - 698

DOI: https://doi.org/10.1007/s40195-013-0265-y

Microstructure and Tribological Behavior of Self-lubricating (Si:N)-DLC/MAO Coatings on AZ80 Magnesium Substrate

Wei YANG ,
Zhennan DENG ,
Dong ZHANG ,
Peiling KE ,
Aiying WANG

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1)School of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an 710032,China
2)Ningbo key laboratory of Marine Protection Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
3) Department of Prosthodontics, School & Hospital of Stomatology, Wenzhou Medical College, Wenzhou 325027, China

Received date: 2013-05-06

Revised date: 2013-07-16

Online published: 2014-02-28

Supported by

National Natural Science Foundation of China (Grant No. 51201176), Industrialization Project of Education Department of Shaanxi Province (Grant No.2012JC13) and Zhejiang Provincial Natural Science Foundation of China (Grant No. Y2110401).

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Abstract

The combined micro arc oxidation (MAO) and a hybrid beam deposition process was used to deposit duplex (Si:N)-DLC/MAO coatings on AZ80 magnesium alloy. The microstructure and composition of the duplex coatings were analyzed by Raman spectroscopy, X-ray photoelectron spectroscope (XPS), scanning electron microscope (SEM) and atomic force microscopy (AFM). Tribological behaviors of the coatings were studied by ball-on-disk friction test. It was found that the ID/IG ratio of the (Si:N)-DLC (diamond-like carbon) top films increases with decreasing C₂H₂/N₂ ratio. The (Si:N)-DLC top film with Si₃N₄ was formed on the MAO coated sample as the C₂H₂/N₂ ratio was 10sccm:5sccm, which showed an increasing critical load compared with the pure DLC directly deposited on the Mg alloy substrate. As a result, the (Si:N)-DLC/MAO coating exhibited an advanced wear protection for the substrate.

Key words： Mg alloy; Micro arc oxidation; DLC; Coating; Microstructure; Tribological behavior

Cite this article

Wei YANG , Zhennan DENG , Dong ZHANG , Peiling KE , Aiying WANG . Microstructure and Tribological Behavior of Self-lubricating (Si:N)-DLC/MAO Coatings on AZ80 Magnesium Substrate[J]. Acta Metallurgica Sinica (English Letters), 2013 , 26(6) : 693 -698 . DOI: 10.1007/s40195-013-0265-y

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