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Metallurgical Aspects of Self-lubricating Composites Containing Graphite and MoS2

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Abstract

The performance of dry self-lubricating bulk materials is directly related to microstructural aspects such as solid lubricant chemical composition and distribution. In this paper, dry powder mixtures were prepared from iron powder and 9-16.5 vol.% of solid lubricants (graphite and MoS2), both combined and isolated. The results showed that interactions and reactions occurred during processing, either between the solid lubricants or between the lubricants and the matrix, generating carbides and sulfides. On account of that, the lubricant distribution in the microstructure is greatly altered, and the microhardness, friction coefficient and wear rate are increased. The best results were achieved by adequate powder particle size, solid lubricant content and sintering temperature control. In the composite containing 9%MoS2 + 2.5%C, values of friction coefficient and wear rate lower than 0.08 and 8 × 10−6 mm3 N−1 m−1 were reached.

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Acknowledgments

The present work was developed with financial aid from CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico—Brazil) Grant No. 163569/2014-2, Whirlpool and BNDES. Special thanks to Höganäs Brazil for powder’s donations. Research was supported by LCME-UFSC.

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Authors and Affiliations

  1. Materials Laboratory (LabMat), Federal University of Santa Catarina, CP 476, Florianópolis, 88040-900, Brazil

    Kaline Pagnan Furlan, Priscila da Costa Gonçalves, Deise Rebelo Consoni, Matheus Vinícius Gouvêa Dias, Gabriel Araújo de Lima, José Daniel Biasoli de Mello & Aloisio Nelmo Klein

  2. Electronic Microscopy Central Laboratory (LCME), Federal University of Santa Catarina, Florianópolis, Brazil

    Deise Rebelo Consoni

  3. Tribology and Materials Laboratory, Federal University of Uberlândia, Uberlândia, Brazil

    José Daniel Biasoli de Mello

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  1. Kaline Pagnan Furlan
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Correspondence to Kaline Pagnan Furlan.

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Furlan, K.P., da Costa Gonçalves, P., Consoni, D.R. et al. Metallurgical Aspects of Self-lubricating Composites Containing Graphite and MoS2 . J. of Materi Eng and Perform 26, 1135–1145 (2017). https://doi.org/10.1007/s11665-017-2563-4

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