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The Role of Graphitic Carbon Nitride in the Formulation of Copper-Free Friction Composites Designed for Automotive Brake Pads
 
 
Article

Microstructural and Tribological Evaluation of Brake Disc Refurbishing Using Fe-Based Coating via Directed Energy Deposition

1
Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy
2
ProM Facility, Trentino Sviluppo S.p.A., Via Fortunato Zeni, 8, 38068 Rovereto, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Badis Haddag
Metals 2022, 12(3), 465; https://doi.org/10.3390/met12030465
Received: 31 January 2022 / Revised: 8 March 2022 / Accepted: 8 March 2022 / Published: 10 March 2022
(This article belongs to the Special Issue New Developments in Friction Brake Materials)
In this paper, the refurbishing of worn-out brake discs by coating with powder via direct energy deposition (DED) is evaluated. A medium carbon steel powder was used to coat cast-iron discs. Deposition of this steel was carried out directly on the disc surface or, alternatively, after a previous deposition of a buffer layer made of stainless steel. It was seen that the use of a buffer layer ensured a good coating adhesion, despite the formation of cast microstructures at the interfaces between the disc and the two different coatings (buffer and outer layer). Coated discs were tested against two different Cu-free commercial friction materials to evaluate their tribological properties. Very similar friction coefficients, specific wear rates, and total emissions were measured for both friction materials sliding against the coated disc. These tribological data are slightly higher with respect to those obtained in the case of an uncoated disc, suggesting that improvement of the top coating composition and surface finishing is necessary in order to achieve better performances. View Full-Text
Keywords: pin-on-disc; direct energy deposition; Fe-based coating; emissions; recycling; brake disc pin-on-disc; direct energy deposition; Fe-based coating; emissions; recycling; brake disc
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MDPI and ACS Style

Rajaei, H.; Menapace, C.; Amirabdollahian, S.; Perini, M.; Straffelini, G.; Gialanella, S. Microstructural and Tribological Evaluation of Brake Disc Refurbishing Using Fe-Based Coating via Directed Energy Deposition. Metals 2022, 12, 465. https://doi.org/10.3390/met12030465

AMA Style

Rajaei H, Menapace C, Amirabdollahian S, Perini M, Straffelini G, Gialanella S. Microstructural and Tribological Evaluation of Brake Disc Refurbishing Using Fe-Based Coating via Directed Energy Deposition. Metals. 2022; 12(3):465. https://doi.org/10.3390/met12030465

Chicago/Turabian Style

Rajaei, Hossein, Cinzia Menapace, Sasan Amirabdollahian, Matteo Perini, Giovanni Straffelini, and Stefano Gialanella. 2022. "Microstructural and Tribological Evaluation of Brake Disc Refurbishing Using Fe-Based Coating via Directed Energy Deposition" Metals 12, no. 3: 465. https://doi.org/10.3390/met12030465

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