Abstract
Processing (grinding, polishing) of phosphate laser (PL) glass involves material removal at two vastly different (spatial) scales. In this study, the nano- and macro-tribological properties of PL glass are investigated by rubbing the glass against a SiO2 counter-surface in both dry and humid conditions. The results indicate that the friction of the PL glass/SiO2 pair has opposing trends at the nano- and macro-scales. At the nanoscale, the friction coefficient (COF) in humid air is much higher than in dry air, which is attributed to the capillary effect of the absorbed water-film at the interface. At the macroscale, on the other hand, the COF in humid air is lower than in dry air, because the water-related mechanochemical wear makes the worn surface less susceptible to cracking. Material removal for PL glass is better facilitated by humid air than by dry air at both scales, because the stress-enhanced hydrolysis accelerates the material-removal process in glass. Moreover, the material-removal is more sensitive to contact pressure at the macroscale, because stronger mechanical-interaction occurs during material removal at the macroscale with the multi asperity contact mode. At the macroscale, the material removal is more sensitive to contact pressure in humid air compared to dry air. Because almost all mechanical energy is used to remove material in humid air, and most of the mechanical energy is used to produce cracks in PL glass in dry air. The results of this study can help optimize the multi-scale surface processing of optical glasses.
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Acknowledgements
The authors are grateful for financial support from the National Natural Science Foundation of China (Nos. 51975492 and 51575462), the Scientific Research Fund of Sichuan Provincial Education Department, China (18ZA0504), the Research Fund Supported by Sichuan Science and Technology Program (2018JY0245), the Research Foundation of Southwest University of Science and Technology (18zx7162), the Tribology Science Fund of State Key Laboratory of Tribology (SKLTKF19B15), and the Project National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology (201910).
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Jiaxin YU. He received his B.S. degree and Ph.D. degree from Southwest Jiaotong University in 2005 and 2011, respectively. From 2015 to 2016, he worked as a research assistant at Yale University in the USA. He is now working as the deputy director of Key Laboratory of Testing Technology for Manufacturing Process in the Ministry of Education, Southwest University of Science and Technology. He is a candidate for academic and technical leaders in Sichuan Province. His current research interests include nanotribology, ultraprecision machining, surface, and interface technology, and tribology of metal-based composite coatings. He has published more than 50 papers in professional journals. As a group leader, he has undertaken more than 20 research projects.
Huimin QI. She received her Ph.D. degree from Lanzhou Institute of Chemical Physics, the Chinese Academy of Sciences, in 2018. She is now working as an associate professor and a master student supervisor in Key Laboratory of Testing Technology for Manufacturing Process in the Ministry of Education, Southwest University of Science and Technology. She interests in the tribology of self-lubricating polymer composites and the frictional interface properties. She has published nearly 20 papers in professional journals.
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Qi, H., Hu, W., He, H. et al. Quantitative analysis of the tribological properties of phosphate glass at the nano- and macro-scales. Friction 9, 1138–1149 (2021). https://doi.org/10.1007/s40544-020-0411-2
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DOI: https://doi.org/10.1007/s40544-020-0411-2