Abstract
In this work, airborne brake wear particulate matter (PM) emissions from a brake system were investigated by time-resolved and temperature-dependent measurement using a dynamometer. The measurement was performed for representative friction materials, 3 low-steel (LS) and 4 non-steel (NS), which are currently in worldwide use. The PM emission factor was found to be varied as large as by one order of magnitude depending on the composition of friction materials(pads). The airborne particle mass emissions from the LS materials ranged from 1.88 to 3.14 mg/km/vehicle, while the emissions from the NS ranged from 0.3 to 2.34 mg/km/vehicle, which is, in general, smaller than the LS. The time-resolved data imply that particle emissions in the extra-high-speed region of the WLTC cycle, where friction occurs at high temperature (Tdisk > 150 °C), is much higher than in the low-speed region, and determines the total PM mass emission factor. It was found that the friction materials containing metals such as Cu and Sn (LS-2/-3 and NS-4/-5) exhibited a lower PM emission factor. This result suggests that copper and tin, which forms an effective lubricating tribolayer in the interface between the pad and disk at high temperature, remarkably reduces PM emissions. It has been also found that the surface roughness of worn brake pads is positively proportional to PM emissions according to surface topography analysis, which is consistent with composition effect. These findings suggest that tribological engineering to provide sliding frictional behavior at elevated temperature is crucial to reducing PM emissions.
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Abbreviations
- LS:
-
Low steel
- NS:
-
Non-steel
- XRF:
-
X-ray fluorescence spectrometer
- CoF:
-
Coefficient of friction
- WLTC:
-
Worldwide harmonized Light duty driving Test Cycle
- LACT:
-
Los Angeles City Traffic
- EF:
-
Emission factor
- PN:
-
Particle number
- XRD:
-
X-ray diffraction
- FE-SEM:
-
Field emission scanning electron microscope
- TEM:
-
Transmission electron microscope
- EDX:
-
Energy-dispersive x-ray spectroscopy
- PM:
-
Particulate matters
References
Grigoratos, T., Martini, G.: Brake wear particle emissions: a review. Environ. Sci. Pollut. Res. 22(4), 2491–2504 (2015)
Bukowiecki, N., Lienemann, P., Hill, M., Furger, M., Richard, A., Amato, F., Prévôt, A.S.H., Baltensperger, U., Buchmann, B., Gehrig, R.: PM10 emission factors for non-exhaust particles generated by road traffic in an urban street canyon and along a freeway in Switzerland. Atmos. Environ. 44(19), 2330–2340 (2010)
Harrison, R.M., Jones, A.M., Gietl, J., Yin, J., Green, D.C.: Estimation of the contributions of brake dust, tire wear, and resuspension to nonexhaust traffic particles derived from atmospheric measurements. Environ. Sci. Technol. 46(12), 6523–6529 (2012)
Garg, B.D., Cadle, S.H., Mulawa, P.A., Groblicki, P.J., Laroo, C., Parr, G.A.: Brake wear particulate matter emissions. Environ. Sci. Technol. 34(21), 4463–4469 (2000)
Sanders, P.G., Xu, N., Dalka, T.M., Maricq, M.M.: Airborne brake wear debris: size distributions, composition, and a comparison of dynamometer and vehicle tests. Environ. Sci. Technol. 37(18), 4060–4069 (2003)
Kumar, P., Pirjola, L., Ketzel, M., Harrison, R.M.: Nanoparticle emissions from 11 non-vehicle exhaust sources: a review. Atmo. Environ. 67, 252–277 (2013)
Brunekreef, B., Forsberg, B.: Epidemiological evidence of effects of coarse airborne particles on health. Eur. Respir. J. 26, 309–318 (2005)
Iijima, A., Sato, K., Yano, K., Kato, M., Kozawa, K., Furuta, N.: Emission factor for antimony in brake abrasion dust as one of the major atmospheric antimony sources. Environ. Sci. Technol. 42(8), 2937–2942 (2008)
Iijima, A., Sato, K., Yano, K., Kato, M., Tago, H., Kato, M., Kimura, H., Furuta, N.: Particle size and composition distribution analysis of automotive brake abrasion dusts for the evaluation of antimony sources of airborne particulate matter. Atmos. Environ. 41(23), 4908–4919 (2007)
Kwak, J., Lee, S., Lee, S.: On-road and laboratory investigations on non-exhaust ultrafine particles from the interaction between the tire and road pavement under braking conditions. Atmos. Environ. 97, 195–205 (2014)
Nosko, O., Olofsson, U.: Quantification of ultrafine airborne particulate matter generated by the wear of car brake materials. Wear 374–375, 92–96 (2017)
Alemani, M., Wahlström, J., Olofsson, U.: On the influence of car brake system parameters on particulate matter emissions. Wear 396–397, 67–74 (2018)
Hagino, H., Oyama, M., Sasaki, S.: Airborne brake wear particle emission due to braking and accelerating. Wear 334–335, 44–48 (2015)
PMP-Group Particle Measurement Program (PMP) of the United Nations Working Party on Pollution and Energy (UNECE−GRPE). https://wiki.unece.org/pages/viewpage.action?pageId=2523173.
Timmers, V.R.J.H., Achten, P.A.J.: Non-exhaust PM emissions from electric vehicles. Atmos. Environ. 134, 10–17 (2016)
Baron, P.A., Willeke, K., Kulkarni, P.: Aerosol Measurement: Principles, Techniques, and Applications. Wiley, New York (2011)
Mathissen, M., Grochowicz, J., Schmidt, C., Vogt, R., FarwickzumHagen, F.H., Grabiec, T., Steven, H., Grigoratos, T.: A novel real-world braking cycle for studying brake wear particle emissions. Wear 414–415, 219–226 (2018)
zum Hagen, F.H.F., Mathissen, M., Grabiec, T., Hennicke, T., Rettig, M., Grochowicz, J., Vogt, R., Benter, T.: Study of brake wear particle emissions: impact of braking and cruising conditions. Environ. Sci. Technol. 53, 5143–5150 (2019)
Chan, D., Stachowiak, G.W.: Review of automotive brake friction materials. Proc. Inst. Mech. Eng. D 218, 953–966 (2004)
Kukutschova, J., Roubíceka, V., Malachova, K., Pavlíckova, Z., Holusab, R., Kubackova, J., Micka, V., Mac Crimmon, D., Filip, P.: Wear mechanism in automotive brake materials, wear debris and its potential environmental impact. Wear 267, 807–817 (2009)
Kukutschova, J., Roubicek, V., Maslan, M., Jancik, D., Slovak, V., Malachova, K., Pavlickova, Z., Filip, P.: Wear performance and wear debris of semimetallic auto- motive brake materials. Wear 268, 86–93 (2010)
Osterle, W., Prietzel, C., Kloß, H., Dmitriev, A.I.: On the role of copper in brake friction materials. Tribol. Int. 43, 2317–2326 (2010)
Thorpe, A., Harrison, R.M.: Sources and properties of non-exhaust particulate matter from road traffic: a review. Sci. Total Environ. 400, 270–282 (2008)
Wahlström, J., Olander, L., Olofsson, L.U.: Size, shape, and elemental composition of airborne wear particles from disc brake materials. Tribol. Lett. 38, 15–24 (2010)
Lawrence, S., Sokhi, R., Ravindra, K., Mao, H., Prain, H.D., Bull, I.D.: Source apportionment of traffic emissions of particulate matter using tunnel measurements. Atmos. Environ. 77, 548–557 (2013)
Hagino, H., Oyama, M., Sasaki, S.: Laboratory testing of airborne brake wear particle emissions using a dynamometer system under urban city driving cycles. Atmos Environ 131, 269–278 (2016)
Perricone, G., Matějka, V., Alemani, M., Valota, G., Bonfanti, A., Ciottia, A., Olofsson, U., Söderberg, A., Wahlström, J., Nosko, O., Straffelini, G., Gialanella, S., Ibrahim, M.: A concept for reducing PM10 emissions for car brakes by 50%. Wear 396–397, 135–145 (2018)
Gardos, M. N.: The problem-solving role of basic science in solid lubrication. In: Proceedings of the new directions in tribology. London (1997)
Kasem, H., Bonnamy, S., Berthier, Y., Jacquemard, P.: Tribological, physicochemical and thermal study of the abrupt friction transition during carbon/carbon composite friction. Wear 267, 846–852 (2009)
Gottstein, G., Zabardjadi, D., Mecking, H.: Dynamic recrystallization in tension-deformed copper single crystals. Metal. Sci. 13, 223–227 (1979)
Luo, J., Mei, Z., Tian, W., Wang, Z.: Diminishing of work hardening in electroformed polycrystalline copper with nano-sized and uf-sized twins. Mater. Sci. Eng. A 441, 240–282 (2006)
Rabinowicz, E.: Friction and Wear of Materials, 2nd edn. Willey, New York (1995)
Jang, H., Ko, K., Kim, S., Basch, R., Fash, J.: The effect of metal fibers on the friction performance of automotive brake friction materials. Wear 256, 406–414 (2004)
Jang, H., Yoon, J.H., Kim, S.J., Lee, J.Y., Park, H.D.: The effect of the composition and microstructure of gray cast iron on preferential wear during parasitic drag and on intrinsic damping capacity, SAE Technical Papers, SAE Technical Paper (2003).
Jiang, J., Arnell, R.D.: The effect of substrate surface roughness on the wear of DLC coatings. Wear 239, 9 (2000)
Lee, S., Jang, H.: Effect of plateau distribution on friction instability of brake friction materials. Wear 400, 1–9 (2018)
Massi, F., Berthier, Y., Baillet, L.: Contact surface topography and system dynamics of brake squeal. Wear 265, 1784–1792 (2008)
Acknowledgements
This work was financially supported under the program of “Development of the high-performance brake for passenger car and commercial vehicle to reduce particulate matter” (20003598) by Ministry of Trade, Industry, and Energy of Korea.
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Kim, SH., Shim, W., Kwon, SU. et al. The Impact of Composition in Non-steel and Low-Steel Type Friction Materials on Airborne Brake Wear Particulate Emission. Tribol Lett 68, 118 (2020). https://doi.org/10.1007/s11249-020-01361-2
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DOI: https://doi.org/10.1007/s11249-020-01361-2