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Open AccessReview

Coatings for Automotive Gray Cast Iron Brake Discs: A Review

1
Department of Engineering Science, University West, 46132 Trollhättan, Sweden
2
R & D Department, Automotive Components Floby AB, 52151 Floby, Sweden
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(9), 552; https://doi.org/10.3390/coatings9090552
Received: 7 August 2019 / Revised: 22 August 2019 / Accepted: 23 August 2019 / Published: 27 August 2019
Gray cast iron (GCI) is a popular automotive brake disc material by virtue of its high melting point as well as excellent heat storage and damping capability. GCI is also attractive because of its good castability and machinability, combined with its cost-effectiveness. Although several lightweight alloys have been explored as alternatives in an attempt to achieve weight reduction, their widespread use has been limited by low melting point and high inherent costs. Therefore, GCI is still the preferred material for brake discs due to its robust performance. However, poor corrosion resistance and excessive wear of brake disc material during service continue to be areas of concern, with the latter leading to brake emissions in the form of dust and particulate matter that have adverse effects on human health. With the exhaust emission norms becoming increasingly stringent, it is important to address the problem of brake disc wear without compromising the braking performance of the material. Surface treatment of GCI brake discs in the form of a suitable coating represents a promising solution to this problem. This paper reviews the different coating technologies and materials that have been traditionally used and examines the prospects of some emergent thermal spray technologies, along with the industrial implications of adopting them for brake disc applications. View Full-Text
Keywords: gray cast iron; brake discs; automotive; emissions; coatings; thermal spray; high velocity air fuel (HVAF); suspension plasma spraying (SPS) gray cast iron; brake discs; automotive; emissions; coatings; thermal spray; high velocity air fuel (HVAF); suspension plasma spraying (SPS)
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MDPI and ACS Style

Aranke, O.; Algenaid, W.; Awe, S.; Joshi, S. Coatings for Automotive Gray Cast Iron Brake Discs: A Review. Coatings 2019, 9, 552.

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