Research Papers: Coatings and Solid Lubricants

Tribological Properties of Nitrile Rubber/UHMWPE/Nano-MoS2 Water-Lubricated Bearing Material Under Low Speed and Heavy Duty

[+] Author and Article Information
Kuang Fuming

Key Laboratory of High Performance
Ship Technology,
Ministry of Education,
Wuhan University of Technology,
Wuhan 430063, China;
Reliability Engineering Institute,
School of Energy and Power Engineering,
Wuhan University of Technology,
Wuhan 430063, China
e-mail: fmkuang@whut.edu.cn

Zhou Xincong, Huang Jian, Zhou Xiaoran, Wang Jun

Key Laboratory of High Performance
Ship Technology,
Ministry of Education,
Wuhan University of Technology,
Wuhan 430063, China;
Reliability Engineering Institute,
School of Energy and Power Engineering,
Wuhan University of Technology,
Wuhan 430063, China

1Present address: School of Energy and Power Engineering, 130 P.O. Box, 1178 Heping Road, Yujiatou Campus, Wuhan University of Technology, Wuhan 430063, China.

2Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 7, 2017; final manuscript received April 2, 2018; published online May 7, 2018. Assoc. Editor: Zhong Min Jin.

J. Tribol 140(6), 061301 (May 07, 2018) (11 pages) Paper No: TRIB-17-1270; doi: 10.1115/1.4039930 History: Received July 07, 2017; Revised April 02, 2018

This study sought to investigate the tribological properties of nitrile rubber (NBR)/ultrahigh molecular weight polyethylene (UHMWPE)/nano-molybdenum disulfide (nano-MoS2) nanocomposites containing various quantities of nano-MoS2. The apparatus used for these tests was a marine stern tube bearing testing apparatus SSB-100V that was water-lubricated and was run at low speed under heavy duty conditions. The coefficient of friction coefficient (COF), wear rate, and surface abrasion of the composite were obtained to determine the effect of the addition nano-MoS2 and to obtain the optimum nano-MoS2 content. The mechanical and physical properties of the rubber-plastic material met the requirements of the Chinese Ship standard CB/T769-2008 and U.S. military standard MIL-DTL-17901C(SH). The experimental results showed that the nanocomposites that contained 9 phr nano-MoS2 (parts by weight per hundred parts of rubber materials) exhibited good comprehensive friction and wear properties. It is believed that the experience achieved from this study can form a theoretical foundation for the improving the properties of the subject rubber-plastic material.

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Fig. 1

SEM photographs of: (a) UHMWPE, (b) MoS2, and (c) nano-MoS2

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Fig. 2

The ship stern bearing test system and the physical map of SSB-100V: 1–loading device; 2–test block; 3–alloy shaft; 4–pressure sensor; 5–level bar; 6–axial bearing; 7–flexible coupling; 8–measuring point of strain gauge; 9–coupling; and 10–coverter motor

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Fig. 4

Schematic of sliding wear testing

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Fig. 5

X-ray diffraction patterns of three materials

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Fig. 6

Analysis of surface energy spectra of cross section with (a) 9 phr and (b) 15 phr nano-MoS2

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Fig. 7

Variation in the COF of the test specimens with various contents of (a) nano-MoS2 and (b) MoS2 at different sliding speeds

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Fig. 8

Variation of COF between moving pairs under low-speed of 0.16 m/s and heavy-loads of 0.84 MPa

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Fig. 9

Variation of wear rate of test block under low speed of 0.16 m/s and heavy-loads of 0.84 MPa

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Fig. 10

The worn surface morphologies of test block with (a) 0 phr nano-MoS2 and MoS2, (b)–(f) 3 phr, 6 phr, 9 phr,12 phr, 15 phr nano-MoS2, and (g)–(k) 6 phr, 9 phr,12 phr, 15 phr MoS2, respectively

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Fig. 11

Variation of Sa (mean) of test block

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Fig. 12

Wear surfaces of test block with (a) 0 phr nano-MoS2 and MoS2, (b) 9 phr MoS2, (c) 9 phr nano-MoS2, (d) 12 phr MoS2, and (e) 12 phr nano-MoS2

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Fig. 13

SEM images of the wear surface of tested blocks with (a) 0 phr nano-MoS2 and MoS2, 9 phr, (b) MoS2, and (c) nano-MoS2 at various sliding velocity

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Fig. 14

Volume wear rate in the case of dry friction (Akron abrasion loss)

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Fig. 15

Analysis of surface energy spectra of copper

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Fig. 16

Lubrication mechanism model of nano-MoS2 nanoparticles: (a) initial contact and (b) scrape and transfer



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