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Research Papers: Friction and Wear

Tribological Properties of Hot-Pressed SrSO4 Ceramic at Elevated Temperatures in Dry Sliding Against Alumina Ball

[+] Author and Article Information
Chong-Chong Mao

School of Materials Science and Engineering,
Shenzhen Graduate School,
Harbin Institute of Technology,
HIT Campus, Shenzhen University Town, Xili,
Nanshan, Shenzhen 518055, China
e-mail: 123949023@qq.com

Yu-Feng Li

School of Materials Science and Engineering,
Shenzhen Graduate School,
Harbin Institute of Technology,
HIT Campus, Shenzhen University Town, Xili,
Nanshan, Shenzhen 518055, China
e-mail: yfli@hit.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received October 26, 2018; final manuscript received January 29, 2019; published online March 4, 2019. Assoc. Editor: Yi Zhu.

J. Tribol 141(5), 051602 (Mar 04, 2019) (6 pages) Paper No: TRIB-18-1444; doi: 10.1115/1.4042679 History: Received October 26, 2018; Accepted January 29, 2019

SrSO4 ceramic was prepared by hot-pressed sintering and its friction behavior was investigated against the Al2O3 ball under the dry sliding condition from room temperature to 800 °C. From room temperature to 400 °C, the tribological properties of SrSO4 ceramic are quite poor with the friction coefficients of 0.65–0.83 and the wear rates of about 10−3 mm3/Nm. With the testing temperature increasing to 600 °C and 800 °C, a brittle to ductile transition of SrSO4 takes place because of the activated slip systems. The friction coefficient and wear rate of SrSO4 ceramic also obviously decrease to 0.37 and about 10−4 mm3/Nm at 800 °C. The significant improvement of the tribological properties is ascribed to the formation of a smooth and continuous SrSO4 lubricating film with excellent ductility and low shear strength at elevated temperature. SrSO4 is considered to be a potential candidate for high-temperature solid lubricant with excellent lubricity.

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Figures

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Fig. 1

X-ray diffraction (XRD) result and scanning electron microscope (SEM) image of the commercial SrSO4 powders: (a) XRD result and (b) SEM image

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Fig. 2

HT-1000 high-temperature tribometer

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Fig. 3

XRD result of hot-pressed SrSO4 ceramic

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Fig. 4

TEM micrograph of hot-pressed SrSO4 ceramic

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Fig. 5

Tribological properties of hot-pressed SrSO4 ceramic from room temperature to 800 °C: (a) friction coefficient and (b) wear rate

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Fig. 6

Friction coefficient curves of hot-pressed SrSO4 ceramic from room temperature to 800 °C

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Fig. 7

Worn surfaces of hot-pressed SrSO4 ceramic after wear test at different temperatures: (a) room temperature, (b) 200 °C, (c) 400 °C, (d) 600 °C, and (e) 800 °C

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Fig. 8

Raman spectra of the worn surfaces of SrSO4 ceramic at different temperatures

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Fig. 9

Worn surface of hot-pressed SrSO4 ceramic after wear test at 600 °C

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Fig. 10

Worn surfaces on countered Al2O3 balls at different temperatures: (a) room temperature, (b) 200 °C, (c) 400 °C, (d) 600 °C, (e) 800 °C, and (f) EDS analysis of marked region A

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