CerMet Coatings for Brake Discs

CerMet coatings for brake discs are considered a most promising technological solution to reduce brake particle emissions. In this work, two CerMet coatings, fabricated using either laser metal deposition (LMD) or high-velocity oxygen fuel (HVOF) spraying, are deposited onto full-scale brake discs and extensively characterised. It is shown that both coatings lead to marked improvements in surface hardness and corrosion resistance compared to conventional uncoated grey cast iron brake discs. In addition, both coatings are shown to induce significant reductions in particle emission levels as measured via specific brake tests on dynamometric benches. This study therefore demonstrates that CerMet coatings represent a valuable solution to reduce brake particle emissions, while increasing the expected service life of brake discs via a combination of enhanced wear and corrosion resistance.