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Research Papers: Coatings and Solid Lubricants

Experimental Study on Tribological Properties of Graphite-MoS2 Coating on GCr15

[+] Author and Article Information
F. M. Meng

The State Key Laboratory of Mechanical
Transmission,
Chongqing University,
Chongqing 400044, China
e-mail: fmmeng@cqu.edu.cn

Z. T. Cui

The State Key Laboratory of Mechanical
Transmission,
Chongqing University,
Chongqing 400044, China
e-mail: zt_cui@cqu.edu.cn

Z. T. Cheng

The State Key Laboratory of Mechanical
Transmission,
Chongqing University,
Chongqing 400044, China
e-mail: zt_cheng@cqu.edu.cn

H. L. Han

The State Key Laboratory of Mechanical
Transmission,
Chongqing University,
Chongqing 400044, China
e-mail: hhl@cqu.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 30, 2017; final manuscript received March 16, 2018; published online May 3, 2018. Assoc. Editor: Min Zou.

J. Tribol 140(5), 051303 (May 03, 2018) (10 pages) Paper No: TRIB-17-1500; doi: 10.1115/1.4039796 History: Received December 30, 2017; Revised March 16, 2018

The graphite-MoS2 coated on GCr15 bearing steel is prepared through air spraying and its tribological performances are investigated experimentally. Then its coefficient of friction (COF) and wear scar width (WSW) are investigated through the MFT-5000 multifunction tribometer and other test equipments. The experimental results show that the addition of the graphite can effectively decrease the COF and narrow the WSW of the MoS2. There exists a critical applied load for wearing out the surface with the graphite-MoS2 coating. Moreover, there exists an optimal rotational speed of 500 rpm to decrease the COF and WSW of the GCr15 steel.

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Figures

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Fig. 3

Surface morphologies of coating: (a) for S1, (b) for S2, (c) for S3, and (d) for S4

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Fig. 4

Cross-sectional morphology of S4

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Fig. 8

XRD patterns of pure graphite and graphite-MoS2 coatings

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Fig. 5

Carbon EDS mapping: (a) for S1, (b) for S2, (c) for S3, and (d) for S4

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Fig. 6

Surface morphology and EDS spectrum: (a) surface morphology of S3 and (b) EDS spectrum of point 1

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Fig. 7

Element contents of S3

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Fig. 9

Tribological properties of graphite-MoS2 coating at varied graphite content (F = 10 N, n = 1000 rpm, r = 7.5 mm): (a) variation of COF with test time and (b) average COF and WSW

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Fig. 10

Scanning electron microscope and 3D microscopic images of worn surfaces at varied graphite content (F = 10 N, n = 1000 rpm, r = 7.5 mm): (a) SEM image of S4 coating, (b) SEM image of S5 coating, (a′) 3D microscopic image of S4 coating, (b′) 3D microscopic image of S5 coating, (a″) SEM image of ball grinding against S4 coating, and (b″) SEM image of ball grinding against S5 coating

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Fig. 14

Scanning electron microscope and 3D microscopic images of worn surfaces at varied rotational speed (S = 20 wt %, F = 10 N, r = 12 mm): (a) SEM image of coating at n = 500 rpm, (b) SEM image of coating at n = 1500 rpm, (a′) 3D microscopic image of coating at n = 500 rpm, (b′) 3D microscopic image of coating at n = 1500 rpm, (a″) SEM image of grinding ball at n = 500 rpm, and (b″) SEM image of grinding ball at n = 1500 rpm

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Fig. 2

Schematic of the rotational friction test

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Fig. 1

Matched pairs in experiment: (a) coated GCr15 test piece and (b) grinding ball

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Fig. 11

Tribological properties of graphite-MoS2 coating at varied applied load (S = 20 wt %, n = 1000 rpm, r = 7.5 mm): (a) variation of COF with test time and (b) average COF and WSW

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Fig. 12

Scanning electron microscope and 3D microscopic images of worn surfaces at varied applied load (S = 20 wt %, n = 1000 rpm, r = 7.5 mm): (a) SEM image of coating at F = 20 N, (b) SEM image of coating at F = 30 N, (a′) 3D microscopic image of coating at F = 20 N, (b′) 3D microscopic image of coating at F = 30 N, (a″) SEM image of grinding ball at F = 20 N, and (b″) SEM image of grinding ball at F = 30 N

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Fig. 13

Tribological properties of graphite-MoS2 coating at varied rotational speed (S = 20 wt %, F = 10 N, r = 12 mm): (a) variation of COF with test time and (b) average COF and WSW

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