Abstract
This work describes experimental studies on the effect of running-in on the tribological properties of friction carbon–carbon (C/C) composite materials used in the production of disc brakes on Russian airplanes. Three groups of friction material were selected for the study, differing in the reinforcement of the pec matrix. The first and second groups’ samples were made of Termar brand carbon composite on the basis of discrete graphitized fiber and different from each other in the length of filaments in the finished material. The third group of samples was made of a composite based on carbonized fiber. The friction coefficient was determined on a tribometer according to a scheme in which the contact pin was on the disc at room temperature (23°C) by a method of a two-factor planned experiment in the range of normal pressures 2—22 MPa and sliding velocities 0.03—0.30 m/s. The study of the third body on the friction path was carried out by Raman spectroscopy using an exciting green laser with a wavelength of 532 nm. The results obtained in this work show that the running-in of the studied C/C materials leads to an increase in the friction coefficient. This is due to the appearance of a third body on the friction track, which is a thin layer of wear particles. By Raman spectroscopy it was show that the third body mainly contains carbon fibers. This work demonstrates the prospects for improving the C/C friction properties by increasing the tribological properties of carbon fibers used in the manufacture of composites.
Similar content being viewed by others
REFERENCES
Kramarenko, E.I., Kulakov, V.V., Kenigfest, A.M., Lisovskii, S.A., and Mozalev, V.V., Aviation breakes with carbon friction disks, Trenie Iznos, 2006, vol. 27, no. 3, pp. 290–298.
Chichinadze, A.V., Kozhemyakina, V.D., and Suvorov, A.V., Method of temperature-field calculation in model ring specimens during bilateral friction in multidisk aircraft brakes with the IM-58-T2 new multipurpose friction machine, J. Frict. Wear, 2010, vol. 31, no. 1, pp. 23–32.
Awasthi, S. and Wood, J.L., C/C composite materials for aircraft brakes, Adv. Ceram. Mater., 1988, vol. 3, no. 5, pp. 449–451.
Kostikov, V.V., Demin, A.V., Kulakov, V.V., et al., Friction carbon-carbon materials Termar, in Sovremennye problemy proizvodstva i ekspluatatsii uglerodnoi produktsii (Modern Problems of Production and Use of Carbon Products), Chelyabinsk, 2000, pp. 211–212.
Golubkov, A.K., Morozov, A.V., and Shpenev, A.G., Tribological properties of materials used in multidisk airplane braking mechanisms, Russ. Eng. Res., 2018, vol. 38, no. 12, pp. 979–982.
Mal’tseva, L.A. and Sharapova, V.A., Zhidkofaznye tekhnologii polucheniya kompozitsionnykh materialov. Matritsy. Uprochniteli (Liquid Phase Technologies for Production of Composite Materials. Matrices. Reinforcers), Yekaterinburg: Ural. Fed. Univ., 2013.
Abdoa, J., Shamseldeen, E., and Lafdee, K., Humidity effects on carbon–carbon composites (fiber pre-form + CVI), Mater. Sci. Eng., A, 2008, vol. 472, pp. 2–14.
Albagachiev, A.Yu., Tribological characteristics of carbon materials of brake discs after appearing of anti-icing fluid on the friction surface, Privody Kompon.Mash., 2018, vol. 29, no. 5, pp. 5–8.
Kravchuk, K.S., Change of tribological properties of coatings and composite materials in submicron and nanometer scales, Cand. Sci. (Phys.–Math.) Dissertation, Moscow, 2015.
Xiao, X., Yin, Y., Bao, J., Lu, L. and Feng, X., Review on the friction and wear of brake materials, Adv. Mech. Eng., 2016, vol. 8, no. 5, pp. 1–10.
Evdokimov, Yu.A. and Kolesnikov, V.I., Planirovanie i analiz eksperimentov pri reshenii zadach treniya i iznosa (Planning and Analysis of Experiments to Solve the Problems of Friction and Wear), Moscow: Nauka, 1980.
Dobychin, M.N., Morozov, A.V., Nikulin, A.V., Sachek, B.Ya., and Anisimov, A.V., The tribotechnical characteristics of phenolic carbon plastics in experimental conditions, Vopr. Materialoved., 2009, vol. 57, no. 1, pp. 186–193.
Bokobza, L., Bruneel, J.-L., and Couzi, M., Raman spectroscopy as a tool for the analysis of carbon-based materials (highly oriented pyrolitic graphite, multilayer graphene and multiwall carbon nanotubes) and of some of their elastomeric composites, Vib. Spectrosc., 2014, vol. 74, pp. 57–63.
ACKNOWLEDGMENTS
The authors are grateful to the staff of JSC “Rubin” OJSC and personally to V.V. Kulakov and A.K. Golubkov for fruitful cooperation and support in the manufacture of modern frictional carbon composites.
Funding
This study was supported by the Russian Scientific Foundation, grant no. 19-19-00548.
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated by K. Gumerov
About this article
Cite this article
Bukovsky, P.O., Morozov, A.V. & Kirichenko, A.N. Influence of Running-In on the Friction Coefficient of C/C Composite Materials for Aircraft Brakes. J. Frict. Wear 41, 326–332 (2020). https://doi.org/10.3103/S1068366620040030
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.3103/S1068366620040030