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Research Papers: Coatings and Solid Lubricants

Sliding Tribological Behavior of Al–Fe–V–Si–Graphite Solid-Lubricating Composites at Elevated Temperatures

[+] Author and Article Information
Hui Tan

State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China;
University of Chinese Academy of Sciences,
Beijing 100039, China
e-mail: tanhui@licp.cas.cn

Shuai Wang

State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mail: licpws@163.com

Jun Cheng

State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mail: chengjun@licp.cas.cn

Shengyu Zhu

State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mail: zhusy@licp.cas.cn

Jun Yang

State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mails: jyang@licp.cas.cn; jyang@lzb.ac.cn

1Corresponding authors.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 9, 2017; final manuscript received July 3, 2017; published online August 16, 2017. Assoc. Editor: Robert Wood.

J. Tribol 140(1), 011302 (Aug 16, 2017) (7 pages) Paper No: TRIB-17-1128; doi: 10.1115/1.4037213 History: Received April 09, 2017; Revised July 03, 2017

Aluminum alloy metal matrix composites (Al-MMCs) have been considered as promising materials for aerospace and automotive industries due to their excellent balance of physical, mechanical, and tribological properties. In the present work, the Al–Fe–V–Si alloy matrix composites with 0–20 wt. % copper-coated graphite were fabricated by hot-pressed sintering. The dry sliding tests were carried out at various temperatures ranging from room temperature (RT) to 350 °C. The microstructure, phase, hardness, and worn surface of the sintered composites were examined in detail. The effect of copper-coated graphite amount on the properties of the composite was also investigated. The results show that the Al–Fe–V–Si–graphite composites mainly consist of α-Al, Al8Fe2Si intermetallic, and graphite phases. The addition of Cu-coated graphite can decrease the friction coefficient and wear rate from RT to 350 °C. The Al–Fe–V–Si–graphite composite containing 10 wt. % copper-coated graphite exhibits better wear properties than other composites. The favorable lubricating properties were attributed to the tribolayer with graphite lubricating film formed on the worn surface.

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Figures

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Fig. 1

XRD patterns of the sintered composites

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Fig. 2

SEM images of the sintered composite: (a) AC0, (b) AC5, (c) AC10, (d) AC15, and (e) AC20

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Fig. 3

Hardness of the sintered composites at different test temperatures

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Fig. 4

Frictional curves of the Al–Fe–V–Si–graphite composites at various temperatures: (a) AC0, (b) AC5, (c) AC10, (d) AC15, and (e) AC20

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Fig. 5

Variation of the friction coefficient of the Al–Fe–V–Si–graphite composites with test temperature

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Fig. 6

Variation of the wear rate of the Al–Fe–V–Si–graphite composite with test temperature

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Fig. 7

Worn surface morphologies of the sintered composites at RT: (a) AC0, (b) AC5, (c) AC10, (d) AC15, and (e) AC20

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Fig. 8

Worn surface morphologies of the sintered composites at 350 °C: (a) AC0, (b) AC5, (c) AC10, (d) AC15, and (e) AC20

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