PSI - Issue 33

Pietro Tonolini et al. / Procedia Structural Integrity 33 (2021) 1152–1161 / Structural Integrity Procedia 00 (2019) 000–000

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4. Conclusions The results of wear tests carried out on a laboratory scale showed that the proposed laser cladding SS coating, containing WC particles, is effective in improving the wear resistance of both disc and pad with respect to the traditional uncoated GCI. The wear rates of R-SS coating are slightly higher than those of the HVOF coating but it has the advantage of being obtained with a cost-saving deposition process and without the use of harmful materials (according to information from the coating manufacturer). On the opposite, the wear behavior of the laser-cladded SS coating was bad. The present work demonstrated the possibility of improving the wear resistance of cast iron brake discs by using powder coatings of stainless steel reinforced with hard particles. This is a good starting point for expanding applications of laser-cladding and new powder compositions will be tested in the next future. Further investigation and development are needed in order to enhance the laser-cladding adhesion to the substrate and to improve the homogeneous dispersion of WC particles in the stainless steel matrix. Acknowledgements Authors would like to thank I. Bodini, D. Paderno, and V. Villa (University of Brescia) for the support in BoR machine design and realization. Andrews, D., 2014. Braking of road Vehicles, 1st ed. Butterworth-Heinemann. Aranke, O., Algenaid, W., Awe, S., Joshi, S., 2019. Coatings for Automotive Gray Cast Iron Brake Discs: A Review. Coatings, 9, 9. Bosch. IDisc. 2020. Avaialble at: < https://www.bosch-mobility-solutions.com/en/solutions/driving-safety/idisc/ >. Accessed on: 03/2020. Dizdar, S., Lyu, Y. Z., Lampa, C., Olofsson, U., 2020. Grey Cast Iron Brake Discs Laser Cladded with Nickel-Tungsten Carbide-Friction, Wear and Airborne Wear Particle Emission. Atmosphere, 11, 6. Djafri, M. Bouchetara, M., Busch, C., Weber, S., 2014. Effects of humidity and corrosion on the tribological behaviour of the brake disc materials. Wear,321, 8-15. ECHA. European Chemical Agency. 2020. Avaialble at: < https://echa.europa.eu/it/substance-information >. Elbrigmann, T. 2017. Hard like Diamond: Porsche Cust. Mag. Christophorus. 4, 384. Federici, M., Menapace, C., Moscatelli, A., Gialanella, S., Straffelini, G. 2016. Effect of roughness on the wear behavior of HVOF coatings dry sliding against a friction material. Wear, 368, 326-334. Federici, M., Menapace, C., Moscatelli, A., Gialanella, S., Straffelini, G., 2017. Pin-on-disc study of a friction material dry sliding against HVOF coated discs at room temperature and 300 degrees C. Tribology International, 115, 89-99. Gelfi, M., Gorini, D., Pola, La Vecchia G. M., 2016. Effect of Titanium on the Mechanical Properties and Microstructure of Gray Cast Iron for Automotive Applications. J. of Materi Eng and Perform 25, 3896–3903. Gonet, T., Maher, B. A.,2019. Airborne, Vehicle-Derived Fe-Bearing Nanoparticles in the Urban Environment: A Review. Environmental Science and Technology, 53,17, 9970-9991. Grabiec, T., 2014. Wear and Friction Behavior of Friction Pairs Tested with Different Types of Grey Cast Iron and Low Met Friction Material. SAE International Journal of Passenger Cars - Mechanical Systems, 7, 4. Gramstat, S., Wanninger, R., Reinhold, B., Sieber, H., Eggenschwiler, P.D., 2019. Hard-metal coated brake discs—investigation of tribology, mechanical robustness and wear products. Proceedings of the Eurobrakes 2019. Grigoratos; Martini. 2014. Non-exhaust traffic related emission. Brake and tyre wear PM. European Commission Joint Research Centre- Institute of Energy and Transport. https://ec.europa.eu/jrc/en/publication/eur-scientific-and-technical-research-reports/non-exhaust-traffic-related emissions-brake-and-tyre-wear-pm Li, Y., Dong, S., Yan, S., Liu, X., Li, E., He, P., Xu, B. 2019. Elimination of voids by laser remelting during laser cladding Ni based alloy on gray cast iron. Optics and Laser Technology, 112, 30-38. Maluf, O., Angeloni, M., Milan, M., Spinelli, D., Wladimir, W., Filho, B., 2004. Development of materials for automotive disc brakes. Pesquisa Technol Minerva. Menapace, C., Mancini, A., Federici, M., Straffelini, G., Gialanella, S., 2019. Characterization of airborne wear debris produced by brake pads pressed against HVOF-coated discs. Friction. Olofsson, U., Lyu, Y., Åström, A. H., Wahlström, J., Dizdar, S., Nogueira, A. P. G., Gialanella, S., 2021. Laser Cladding Treatment for Refurbishing Disc Brake Rotors: Environmental and Tribological Analysis. Tribology Letters, 69, 2. Perricone, G., Mat ě jka, V., Alemani, M., Valota, G., Bonfanti, A., Ciotti, A., Olofsson, U., Söderberg, A., Wahlström, J., Nosko, O., Straffelini, G., Gialanella, S., Ibrahim, M., 2018. A concept for reducing PM10 emissions for car brakes by 50%. Wear, 396-397, 135-145. References