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Research Papers: Coatings and Solid Lubricants

Preparation and Structure of W/Mo Films and Their Tribological Properties in the Lubrication of MoDTC

[+] Author and Article Information
Xingliang Li

School of Engineering and Technology,
China University of Geosciences (Beijing),
29th Xueyuan Road,
Haidian District,
Beijing 100083, China;
Aviation Key Laboratory of Science and
Technology on Precision
Manufacturing Technology,
Beijing Precision Engineering Institute for
Aircraft Industry,
5th Nanyuan Road,
Fengtai District,
Beijing 100076, China
e-mail: lixing3758@126.com

Wen Yue

School of Engineering and Technology,
China University of Geosciences (Beijing),
29th Xueyuan Road,
Haidian District,
Beijing 100083, China
e-mail: cugbyw@163.com

Chengbiao Wang

School of Engineering and Technology,
China University of Geosciences (Beijing),
29th Xueyuan Road,
Haidian District,
Beijing 100083, China
e-mail: aliciasuwanqing@163.com

Jiajun Liu

Mechanical Engineering Department,
Tsinghua University,
18th Xueyuan Road,
Haidian District,
Beijing 100084, China
e-mail: 641431962@qq.com

Guolong Li

Aviation Key Laboratory of Science and
Technology on Precision
Manufacturing Technology,
Beijing Precision Engineering Institute for
Aircraft Industry,
5th Nanyuan Road,
Fengtai District,
Beijing 100076, China
e-mail: 765074501@qq.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 11, 2016; final manuscript received February 10, 2017; published online June 14, 2017. Assoc. Editor: Robert Wood.

J. Tribol 139(6), 061301 (Jun 14, 2017) (9 pages) Paper No: TRIB-16-1322; doi: 10.1115/1.4036175 History: Received October 11, 2016; Revised February 10, 2017

W, Mo, and W–Mo alloy films are prepared on 316L stainless steel by means of ion beam assisted deposition (IBAD). Tribological behaviors of the treated surfaces are investigated under lubrication with molybdenum dialkyldithiocarbamate (MoDTC) on a MS-T3000 friction and wear tester. The micromorphologies and chemical characteristics of the tribofilms generated on the worn surfaces are analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), respectively. The results showed that the obvious synergistic effects of better friction reduction and wear resistance between W–Mo film and MoDTC are attributed to the hard surface and the high decomposition rate of additives on the worn W–Mo surface.

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Figures

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Fig. 1

The 3D topographies of the films: (a) W, (b) Mo, and (c) W–Mo

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Fig. 2

SEM images of (a) W film, (b) Mo film, and (c) W–Mo alloy film

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Fig. 3

Cross-sectional morphology of (a) W film, (b) Mo film, and (c) W–Mo alloy film

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Fig. 4

(a) XRD patterns of the three films and (b) XRD scan around the (110) main peak of the W–Mo alloy film

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Fig. 5

Microhardness and modulus with the penetration depth of the three films

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Fig. 6

Variation of average friction coefficient of substrate, W pure film, Mo pure film, and W–Mo alloy film lubricated with (a) PAO and (b) PAO + 1% MoDTC

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Fig. 7

Wear volumes of the films in different lubricant conditions

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Fig. 8

Worn morphologies of the films in lubrication of PAO and PAO + MoDTC: (a) 316L + PAO, (b) 316L + PAO + MoDTC, (c) W + PAO, (d) W + PAO + MoDTC, (e) Mo + PAO, (f) Mo + PAO + MoDTC, (g) W–Mo + PAO, and (h) W–Mo + PAO + MoDTC

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Fig. 9

The 1000× morphologies on the wear Mo surfaces

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Fig. 10

Cross-sectional profile of the wear scars on the surfaces of four different films in the lubrication of PAO + 1% MoDTC

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Fig. 11

EDS spectra of four films lubricated by PAO + 1% MoDTC

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