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

Autor: Yangyang Zhao, Guoyuan Zhang, Junqian Wang, He Wang, Weigang Zhao, Qunfeng Zeng
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Friction, Vol 12, Iss 2, Pp 305-318 (2023)
Druh dokumentu: article
ISSN: 2223-7690
2223-7704
DOI: 10.1007/s40544-023-0759-1
Popis: 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.
Databáze: Directory of Open Access Journals
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