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Volume 10
Issue 5
10.3390/lubricants10050086
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Article

Self-Lubricating Effect of FeWO4 Tribologically Synthesized from WC-(Fe-Mn-C) Composite during High-Speed Sliding against a HSS Disk

by
Nikolai Savchenko
,
Irina Sevostyanova
and
Sergei Tarasov
*
Institute of Strength Physics and Materials Science, 634055 Tomsk, Russia
*
Author to whom correspondence should be addressed.
Lubricants 2022, 10(5), 86; https://doi.org/10.3390/lubricants10050086
Submission received: 25 March 2022 / Revised: 15 April 2022 / Accepted: 29 April 2022 / Published: 4 May 2022
(This article belongs to the Special Issue Friction and Wear in Composite Materials)
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Abstract

WC-(Fe-Mn-C) composites with γ-iron and γ + α’ matrices were sintered and then tested at sliding speeds in the range 7–37 m/s. The coefficient of friction was exponentially reduced as a function of sliding speed reaching its minimum at 37 m/s. This behavior was provided by the mechanochemical formation of iron tungstate FeWO4 on the worn surfaces of composite samples. The lubricating effect of iron tungstate did not, however, allow for a reduction in wear. The worn surface was represented by a 3–10 μm-thickness tribological layer composed of fine WC and iron particles cemented by FeWO4. This layer provided the self-lubricating effect in high-speed (high-temperature) sliding because of its easy shear and quasi-viscous behavior. The underlying 25–65 μm of thickness layer was composed of only heat-affected WC and recrystallized iron grains.
Keywords: composite; lubrication; sliding; friction composite; lubrication; sliding; friction

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MDPI and ACS Style

Savchenko, N.; Sevostyanova, I.; Tarasov, S. Self-Lubricating Effect of FeWO4 Tribologically Synthesized from WC-(Fe-Mn-C) Composite during High-Speed Sliding against a HSS Disk. Lubricants 2022, 10, 86. https://doi.org/10.3390/lubricants10050086

AMA Style

Savchenko N, Sevostyanova I, Tarasov S. Self-Lubricating Effect of FeWO4 Tribologically Synthesized from WC-(Fe-Mn-C) Composite during High-Speed Sliding against a HSS Disk. Lubricants. 2022; 10(5):86. https://doi.org/10.3390/lubricants10050086

Chicago/Turabian Style

Savchenko, Nikolai, Irina Sevostyanova, and Sergei Tarasov. 2022. "Self-Lubricating Effect of FeWO4 Tribologically Synthesized from WC-(Fe-Mn-C) Composite during High-Speed Sliding against a HSS Disk" Lubricants 10, no. 5: 86. https://doi.org/10.3390/lubricants10050086

APA Style

Savchenko, N., Sevostyanova, I., & Tarasov, S. (2022). Self-Lubricating Effect of FeWO4 Tribologically Synthesized from WC-(Fe-Mn-C) Composite during High-Speed Sliding against a HSS Disk. Lubricants, 10(5), 86. https://doi.org/10.3390/lubricants10050086

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