Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 9, Issue 4, Pages 8207-8220Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2020.05.095
Keywords
Self-lubricating behavior; Friction interface; Surface micropore; M50; Sn-Ag-Cu
Funding
- National Natural Science Foundation of China [51705390]
- Natural Science Foundation of Shaanxi Province [2018JQ5029]
- Science and Technology on Diesel Engine Turbocharging Laboratory [6142212190104]
- Key Laboratory Project of Shaanxi Province Education Department [19JS033]
- Xi'an Technological University school-level fluid lubrication technology research and innovation team
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The friction interface structure has an important influence on the friction behavior of self-lubricating materials. In this paper, M50 material covered with surface micropores filled with Sn-Ag-Cu (MM-S-alloy) was prepared by laser melt deposition. From 25-450 degrees C, the friction test results show that MM-S-alloy exhibits distinguished tribological properties due to the existence of the microporous friction interface. Analysis indicates that Sn-Ag-Cu in surface micropores can dynamically precipitates to the worn surface of MM-S-alloy to achieve a lubricating effect, and the increasing of temperature is beneficial to the dynamic precipitation of Sn-Ag-Cu. The whole friction process can be divided into the initial wear stage, fast wear stage and stable wear stage. At stable wear stage, the friction interface is mainly composed of a lubricant-rich surface lubrication layer and a subsurface load-bearing layer, which greatly improves the material's wear resistance. Especially at 350 degrees C, the surface lubrication layer and subsurface load -bearing layer are most easily formed. (C) 2020 The Author(s). Published by Elsevier B.V.
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