Characterization of ultrafine particles from hardfacing coated brake rotors

Abstract Automotive brake rotors are commonly made from gray cast iron (GCI). During usage, gradually worn off and periodically replaced. Currently, replaced mostly remelted to produce brand-new products, resulting in a relatively high energy consumption carbon footprint into the environment. In addition, automotive brakes emit airborne particles. Some of emitted particles categorized as ultrafine, which sized below 100 nm, leading series health environmental impacts. this study, two surface treatment techniques applied, i.e., high-velocity oxygen fuel (HVOF) laser cladding (LC), overlay wear-resistant coatings on conventional GCI order refurbish rotor avoid remelting procedure. The coating materials evaluated terms their coefficient friction (CoF), wear, ultrafine particle emissions, by comparing them with typical rotor. results show that CoF HVOF disc is higher than those LC discs. Meanwhile, has lowest wear rate but highest mating pad material. yields similar disc. discs appeared primarily round, chunky, flake shapes. emits unique needle-shaped range, generate nm running-in period 200 steady state. ∼200 entire test run.