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.
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This work was supported by the National Natural Science Foundation of China (No. 52075407) and Natural Science Foundation of Shaanxi Province of China (No. 2019JM-034).
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Yangyang ZHAO. He received his M.S. degree in mechanical engineering from Xidian University, China, in 2021. He is currently a Ph.D. candidate in mechanical engineering at Xidian University. He has published five papers in mechanical seal and friction tests. His major research areas include mechanical seal and friction and wear.
Guoyuan ZHANG. He received his Ph.D. degree in mechanical engineering in 2009 from Xi’an Jiaotong University, China. He has joined School of Mechano-Electronic Engineering, Xidian University, China, from 2013 and has been working on theoretical and experimental research and development on tribology (bearing, seal, lubricate, etc.), system dynamics, and mechanical design method.
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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 12, 305–318 (2024). https://doi.org/10.1007/s40544-023-0759-1
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DOI: https://doi.org/10.1007/s40544-023-0759-1