Controlling the solid-state reaction in Fe-MoS2 self-lubricating composites for optimized tribological properties

In this work, self-lubricating composites containing MoS₂ and graphite dispersed in an iron matrix were produced by powder metallurgy and sintering. Previous studies demonstrate that MoS₂ reacts with iron matrixes during sintering, making the production of Fe-MoS₂ composites rather difficult. Therefore, this study focused on a potential solution to avoid or reduce this reaction, whilst still providing good tribological properties. Our results show that the addition of graphite retards the reaction of MoS₂ with iron and that the combination of MoS₂ + graphite results in composites with an optimized coefficient of friction associated with a low wear rate both in nitrogen and air atmospheres. Through adequate control of the lubricant’s particle size, composition, and processing parameters, self-lubricating iron-based composites with a low dry coefficient of friction (0.07) and low wear rate (5 x 10⁻⁶ mm³ .N⁻¹.m⁻¹) were achieved.

Subjects

self-lubricating composites

sintering

solid lubricants

tribological properties

DDC Class

600: Technik

620: Ingenieurwissenschaften

Funding Organisations

Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil

More Funding Information

The present work was developed with financial aid from CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico—Brazil) Grant number 163569/2014-2, Whirlpool and BNDES. Research supported by LCME-UFSC.

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publishedVersion

Lizenz

https://creativecommons.org/licenses/by/4.0/

Name

lubricants-10-00142-v2.pdf

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2.36 MB

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Adobe PDF

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Controlling the solid-state reaction in Fe-MoS2 self-lubricating composites for optimized tribological properties