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Research Article | Open Access

Tribological properties of low-temperature time-dependent pretreated graphite for mechanical seal pairs in high-speed turbopump

Yangyang ZHAO1, Guoyuan ZHANG1( ), Junqian WANG1, He WANG1, Weigang ZHAO2, Qunfeng ZENG3
School of Mechano-Electronic Engineering, Xidian University, Xi’an 710071, China
Xi’an Aerospace Propulsion Institute, Xi’an 710071, China
Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an 710049, China
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Abstract

The friction coefficient and wear rate of pretreated graphite with liquid nitrogen were obtained by using a ball-on-disk tester, and the wear of GCr15–graphite seal pairs with the low-temperature time-dependent pretreatment was discussed by comparing the wear morphology. The results show that liquid nitrogen pretreatment can affect the hardness and interlayer spacing of graphite. The range of the friction coefficients of pretreated graphite changes from 0.17 to 0.22. With the increase of liquid nitrogen pretreatment time, the wear mechanism of graphite would change from dominated three-body wear to adhesion wear. The experimental results of the mechanical seal with liquid nitrogen pretreatment show that the wear rate of stator is less than 0.00165 mm3·N−1·m−1, and the graphite shows a good low-temperature compatibility.

Keywords

graphitelow-temperature pretreatmentmechanical sealfriction and wear

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Friction
Volume 12 Issue 2,
February 2024
Pages 305-318
DOI: 10.1007/s40544-023-0759-1
Cite this article:
ZHAO Y, ZHANG G, WANG J, et al. Tribological properties of low-temperature time-dependent pretreated graphite for mechanical seal pairs in high-speed turbopump. Friction, 2024, 12(2): 305-318. https://doi.org/10.1007/s40544-023-0759-1

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Received: 26 October 2022
Revised: 02 February 2023
Accepted: 10 March 2023
Published: 24 August 2023
© The author(s) 2023.

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