Abstract
Running-in is the initial stage during which a tribological system reaches a steady-state condition. In this study, the running-in behaviour of a commercial brake friction material, pin-on-disc tested under dry sliding conditions, has been investigated to understand the role of different surface finishing of hard coatings. These coatings were deposited onto cast iron counterface discs and then mechanically polished to achieve set values of average roughness, Ra, and roughness skewness, Rsk. The tribological data were modelled using an exponential relation for the wear rate, according to a literature approach. The model parameters were related to the above-mentioned disc surface roughness parameters. The results provided indications on the wear mechanisms acting during the sliding action. Furthermore, these mechanisms were correlated with the formation of the friction layers on the pins and on the disc wear tracks. Of particular relevance is the finding that a negatively skewed surface roughness is fundamental to achieve the best running-in performances. The beneficial effects, coming from this surface treatment, are derived from the reduction in abrasion and from the improved formation dynamics of the friction layer, with particular regard to those parts (secondary plateaus) made of compacted wear debris.
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References
Archard, J.F.: Contact and rubbing of flat surfaces. J. Appl. Phys. 24(8), 981–988 (1953)
Blau, P.J., Whitenton, E.P., Shapiro, A.: Initial frictional behavior during the wear of steel, aluminum and poly(methyl methacrylate) on abrasives papers. Wear 124, 1–20 (1988)
Eriksson, M., Jacobson, S.: Tribological surfaces of organic brake pads. Tribol. Int. 33, 817–827 (2000)
Eriksson, M., Bergman, F., Jacobson, S.: On the nature of tribological contact in automotive brakes. Wear 252, 26–36 (2002)
Eriksson, M., Bergman, F., Jacobson, S.: Surface characterisation of brake pads after running under silent and squealing conditions. Wear 232, 163–167 (1999)
Verma, P.C., Menapace, L., Bonfanti, A., Ciudin, R., Gialanella, S., Straffelini, G.: Braking pad-disc system: wear mechanisms and formation of wear fragments. Wear 322–323, 251–258 (2015)
Jacko, M.G., Tsang, P.H.S., Rhee, S.K.: Wear debris compaction and friction film formation of polymer composites. Wear 133, 23–38 (1989)
Jiang, J., Stott, F.H., Stack, M.M.: The role of triboparticulates in dry sliding wear. Tribol. Int. 31(5), 245–256 (1998)
Wirth, A., Eggleston, D., Whitaker, R.: A fundamental tribochemical study of the third body layer formed during automotive friction braking. Wear 179, 75–81 (1994)
Kumar, R., Prakash, B., Sethuramiah, A.: A systematic methodology to characterise the running-in and steady-state wear process. Wear 252, 445–453 (2002)
Hanief, M., Wani, M.F.: Effect of surface roughness on wear rate during running-in of En31-steel: model and experimental validation. Mater. Lett. 176, 91–93 (2016)
Wang, W., Wong, P.L., Zhang, Z.: Experimental study of the real time change in surface roughness during running-in for PEHL contacts. Wear 244, 140–146 (2000)
Hanief, M., Wani, M.F.: Modeling and prediction of surface roughness for running-in wear using Gauss–Newton algorithm and ANN. Appl. Surf. Sci. 357, 1573–1577 (2015)
Zheng, M., Naeim, A.H., Walter, B., John, G.: Break-in liner wear and piston ring assembly friction in a spark-ignited engine. Tribol. Trans. 41(4), 497–504 (1998)
Schneider, E.W., Blossfeld, D.H., Balnaves, M.A.: Effect of Speed and Power Output on Piston Ring Wear in a Diesel Engine. SAE paper no. 880672, SAE, Warrendale, PA (1988)
Federici, M., Menapace, C., Moscatelli, A., Gialanella, S.: Effect of roughness on the wear behavior of HVOF coatings dry sliding against friction material. Wear 369–369, 326–334 (2016)
Day, A.J.: Braking of Road Vehicles. Elsevier, Amsterdam (2014)
Straffelini, G., Maines, L.: The relationship between wear of semimetallic friction materials and pearlitic cast iron in dry sliding. Wear 307, 75–80 (2013)
La Vecchia, G.M., Mor, F., Straffelini, G., Doni, D.: Microstructure and sliding wear behavior of thermal spray carbide coatings. Int. J. Powder Metall. 35, 37–46 (1999)
Mor, F., La Vecchia, G.M., Stehle, D.: Caratterizzazione di riporti thermal spray ottenuti con sistema HVOF al variare dei parametri di processo. La Met. It. 88, 363–370 (1996)
Xie, M., Zhang, S., Li, M.: Comparative investigation of HVOF sprayed carbide-based coatings. Appl. Surf. Sci. 273, 799–805 (2013)
Saharaoui, T., Fenineche, N.E., Montavon, G., Coddet, C.: Structure and wear behaviour of HVOF sprayed Cr3C2–NiCr and WC–Co coatings. Mater. Des. 24, 309–313 (2003)
Bolelli, G., Berger, L.M., Bonetti, M., Lusvarghi, L.: Comparative study of the dry sliding wear behaviour of HVOF-sprayed WC–(W, Cr)2C–Ni and WC–CoCr hardmetal coatings. Wear 309, 96–111 (2014)
Zhang, W., Liu, L., Zhang, M., Huang, G., Liang, J., Li, X., Zhang, L.: Comparison between WC–10Co–4Cr and Cr3C2–25NiCr coatings sprayed on H13 steel by HVOF. Trans. Nonferrous Met. Soc. China 25, 3700–3707 (2015)
Gosh, A., Sadeghi, F.: A novel approach to model effects of surface roughness parameters on wear. Wear 338–339, 73–94 (2015)
Sedlaček, M., Podgonrnik, B., Vižintin, J.: Correlation between standard roughness parameters skewness and kurtosis and tribological behavior of contact surfaces. Tribol. Int. 48, 102–112 (2012)
Ao, Y., Wang, Q.J., Chen, P.: Simulating the worn surface in a wear process. Wear 252, 37–47 (2002)
Hu, S., Brunetiere, N., Huang, W., Liu, X., Wang, Y.: Evolution of bi-Gaussian parameters of silicon-carbide and carbon-graphite discs in dry sliding wear process. Tribol. Int. 112, 75–85 (2017)
Dante, R.: Handbook of Friction Materials and Their Application, 1st edn. Woodhead Publishing, Cambridge (2015)
Federici, M., Straffelini, G., Gialanella, S.: Pin-on-disc testing of low-metallic friction material sliding against HVOF coated cast iron: modelling of the contact temperature evolution. Tribol. Lett. 65, 121 (2017)
Federici, M., Menapace, C., Moscatelli, A., Gialanella, S., Straffelini, G.: Pin on disc study of a friction material dry sliding against HVOF coated discs at room temperature and 300°C. Tribol. Int. 115, 89–99 (2017)
Straffelini, G., Verma, P.C., Metinoz, I., Ciudin, R., Perricone, G., Gialanella, S.: Wear behavior of a low metallic friction material dry sliding against a cast iron disc: role of the heat-treatment of the disc. Wear 348–349, 10–16 (2016)
Wang, W., Wong, P.L.: Wear volume determination during running-in for PEHL contacts. Tribol. Int. 33, 501–506 (2000)
Straffelini, G.: Friction and Wear, Methodologies for Design and Control. Springer, Switzerland (2015)
Rabinowicz, E.: Friction and Wear of Materials, 2nd edn. Wiley, New York (1995)
Acknowledgements
The research leading to these results received funding from the European Union’s Horizon 2020 Research and Innovation Action programme under the Grant Agreement No. 636592 (LOWBRASYS Project). The authors would also like to thank Flame Spray (Roncello, Italy), partner in the mentioned project, for the deposition of the coatings, and to our former master student Roberto Moratti for his help in the experimental testing during his thesis.
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Federici, M., Perricone, G., Gialanella, S. et al. Sliding Behaviour of Friction Material Against Cermet Coatings: Pin-on-Disc Study of the Running-in Stage. Tribol Lett 66, 53 (2018). https://doi.org/10.1007/s11249-018-1004-3
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DOI: https://doi.org/10.1007/s11249-018-1004-3