Conclusions
In friction at a sliding rate of 40 m/sec and a pressure of 0.1 MPa. a finely disperse mixture of particles of copper and its oxides forms on the surface of pure copper; these particles increase the strength of the surface layer of copper, reduce its wear, but do not prevent bonding processes from taking place.
In friction of DGr-5 material at a sliding speed of 11 m/sec under a pressure of 0.1 MPa., surface films consisting of ultradisperse particles of copper and oxides form; the dimensions of the graphite particles are comparable with those of the initial particles. Since the graphite particles cannot extend completely along the prismatic planes to the friction surface and the amount of graphite is insufficient for ensuring the lubricating effect, DGr-5 material is not capable of efficient operation in these conditions.
The surface films formed during friction on DGr-10 composite material are characterized by uniform distribution of the graphite particles and consist of ultradisperse copper and fineplate textured graphite with preferential orientation with the basal planes parallel to the friction surface; this results in higher values of the tribotechnical characteristics.
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Translated from Poroshkovaya Metallurgiya, No. 12(300), pp. 66–71, December, 1987.
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Dyachenko, L.I., Paderno, V.N., Baranov, N.G. et al. Substructure of the friction surface of copper and copper-graphite materials. Powder Metall Met Ceram 26, 1006–1011 (1987). https://doi.org/10.1007/BF00797791
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DOI: https://doi.org/10.1007/BF00797791