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

[+] Author and Article Information
Chong-Chong Mao

HIT Campus, Shenzhen University Town, Xili, Nanshan, Shenzhen 518055, PR China Shenzhen, 518055 China 123949023@qq.com

Yu-Feng Li

HIT Campus, Shenzhen University Town, Xili, Nanshan Shenzhen Shenzhen, Guangdong 518055 China 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 xx xx, xxxx. Assoc. Editor: Yi Zhu.

ASME 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 Al2O3 ball under 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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