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Wear Behavior of Copper–Graphite Composites Processed by Field-Assisted Hot Pressing

1
Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, China
2
IMDEA Materials Institute, C/Eric Kandel 2, Getafe, 28906 Madrid, Spain
3
Dpto. Matemática Aplicada, Ciencia e Ingeniería de Materiales y Tecnología Electrónica, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, C/Tulipan s/n, Móstoles, 28933 Madrid, Spain
4
FIDAMC, Foundation for Research, Development and Application of Composite Materials, Avda. Rita Levi-Montalcini 29, Getafe, 28906 Madrid, Spain
5
Dpto. Ciencia e Ingeniería de Materiales e Ingeniería Química, Universidad Carlos III de Madrid, Av. de la Universidad 30, 28911 Leganés, Spain
*
Author to whom correspondence should be addressed.
J. Compos. Sci. 2019, 3(1), 29; https://doi.org/10.3390/jcs3010029
Received: 6 February 2019 / Revised: 15 March 2019 / Accepted: 18 March 2019 / Published: 25 March 2019
(This article belongs to the Special Issue Recent Advances in Graphene-based Nanocomposites)
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Abstract

Copper–graphite composites with 0–4 wt % graphite were fabricated by field-assisted hot pressing with the aim of studying the effect of graphite content on microhardness and tribological properties. Experimental results reveal that hardness decreases with the graphite content. Wear testing was carried out using a ball-on-disc tribometer with a normal load of 8 N at a constant sliding velocity of 0.16 m/s. The friction coefficient of composites decreases significantly from 0.92 to 0.29 with the increase in graphite content, resulting in a friction coefficient for the 4 wt % graphite composite that is 68.5% lower than pure copper. The wear rate first increases when the graphite content is 1 wt %; it then decreases as the graphite content is further increased until a certain critical threshold concentration of graphite, which seems to be around 3 wt %. Plastic deformation in conjunction with some oxidative wear is the wear mechanism observed in pure copper, while abrasive wear is the main wear mechanism in copper–graphite composites. View Full-Text
Keywords: copper–graphite composites; field-assisted hot pressing; friction coefficient; wear copper–graphite composites; field-assisted hot pressing; friction coefficient; wear
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Liu, Q.; Castillo-Rodríguez, M.; Galisteo, A.J.; Guzmán de Villoria, R.; Torralba, J.M. Wear Behavior of Copper–Graphite Composites Processed by Field-Assisted Hot Pressing. J. Compos. Sci. 2019, 3, 29.

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