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      Friction Behavior of Silver Perrhenate in Oil as Lubricating Additive for Use at Elevated Temperatures

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          Abstract

          In this study, we use an aqueous solution synthesis method to prepare silver perrhenate powders and suspend them into a poly alpha olefin (PAO) base oil with polyoxyethylene octylphenyl ether. Four ball tests and ball-on-disk reciprocating mode are performed to determine how silver perrhenate performs tribologically as a lubricating additive over a wide range of temperatures. The physical and chemical properties, as well as the lubricating mechanisms of the silver perrhenate additive, are characterized via X-ray diffraction, scanning electron microscope, Fourier transformation infrared spectroscopy, Raman spectrum, and X-ray photoelectron spectroscopy. The four-ball test results demonstrate that the oil added with silver perrhenate additive is more effective than the base oil in reducing friction and improving wear resistance, and provides the best lubricating performance when at a concentration of 0.5 wt%. The reciprocating mode findings indicate that the hybrid lubricant exhibits distinctively better tribological properties than the base oil at high temperatures, and its low shear strength and chemical inertness allow for low friction at elevated temperatures. The resulting silver perrhenate layer that incorporates native superalloy oxides on the worn surface can provide lubrication by serving as a barrier that prevents direct contact between the rubbing surfaces at elevated temperatures.

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          Analysis of XPS spectra of Fe2+ and Fe3+ ions in oxide materials

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            Ionic liquid lubricants: designed chemistry for engineering applications.

            This tutorial review outlines current state of the art research on ionic liquid lubricants. Ionic liquids (ILs) were first reported as very promising high-performance lubricants in 2001 and have attracted considerable attention in the field of tribology since then because of their remarkable lubrication and anti-wear capabilities as compared with lubrication oils in general use; in recent times we have seen dramatically increased interest in the topic. The review starts with a brief introduction to ILs and fluid lubrication, and then discusses in more detail the tribological properties of IL lubricants, either as lubrication oils, additives or thin films. As well as lubrication mechanisms, some current problems and potential solutions are tentatively discussed.
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              Solid lubricant materials for high temperatures—a review

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                08 July 2019
                July 2019
                : 12
                : 13
                : 2199
                Affiliations
                School of Mechanical Engineering, Shenyang Jianzhu University, No.9 Hunnan East Road, Hunnan District, Shenyang 110168, China
                Author notes
                [* ]Correspondence: jhwang@ 123456sjzu.edu.cn ; Tel.: +86-024-24694412
                Article
                materials-12-02199
                10.3390/ma12132199
                6651473
                31288441
                8438c91d-49c6-4795-9666-b8a9b1e564cd
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 16 June 2019
                : 04 July 2019
                Categories
                Article

                silver perrhenate,additive,lubrication,elevated temperatures

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