Wear Resistance of Composites Based on Expanded Graphite and a Steel Base with Structured Macroscopic Relief
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Resistance of Composites Based on Expanded Graphite and a Steel Base with Structured Macroscopic Relief D. M. Karavaeva, *, E. V. Matygullinaa, **, ***, N. N. Zubkovb, ****, D. V. Smirnovc, *****, O. Yu. Isaevc, ******, and T. R. Ablyaza aPerm
National Research Polytechnic University, Perm, Russia Bauman Moscow State Technical University, Moscow, Russia c OOO Silur, Perm, Russia *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] ****e-mail: [email protected] *****e-mail: [email protected] ******e-mail: [email protected]
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Received January 17, 2020; revised January 17, 2020; accepted January 17, 2020
Abstract—The properties of composites based on expanded graphite and a steel base with structured macroscopic relief are studied: specifically, the wear resistance, frictional coefficient, and reduced wear. The structured macroscopic relief is produced by deformational cutting. Keywords: slip bearings, expanded graphite (EG), composites, friction, wear resistance, deformational cutting DOI: 10.3103/S1068798X20100123
The performance of slip bearings in demanding operating conditions without lubricant is critical to the long life, reliability, fault-free operation, and reparability of industrial equipment. Improving bearing performance decreases production, maintenance, and repair costs. The wear resistance is a fundamental characteristic of slip bearings. In the present work, we determine the wear resistance and frictional coefficient of new composites based on expanded graphite and a steel base with structured macroscopic relief that is produced by deformational cutting. In deformational cutting, partial cutting of the margin is followed by targeted plastic deformation of the resulting surface layer (Fig. 1). The chip produced is not completely separated from the workpiece; it is still connected on the short side [1, 2]. The set of partially attached surface layers gives rise to macroscopic relief on the machined surface. This technology is characterized by high productivity and may be used to produce a broad range of surface relief. Both specialized and standardized metalcutting equipment may be employed. By deformational cutting, the heat-transfer surface may be increased, while the strength of the bearing’s antifrictional coating and its adhesive strength with the base may be improved [3].
By deformational cutting, we obtain square (25 × 25 mm) samples of AISI 316L steel with ribbed relief. An expanded graphite antifrictional layer is applied to the surface. In the initial surface relief, ribs of height 0.60 ± 0.01 mm and pitch 0.30 ± 0.02 mm are separated by a gap of 0.10 ± 0.01 mm. In Fig. 2, we show the ribbed surface produced by deformational cutting. The antifrictional layer is a flexible sheet of expanded graphite (thickness 0.6 mm, density 0.96 g/cm3). It is introduced in the ribbed surface without binder; the gaps are completely filled. In tests, breakaway of the coating from the ribbed base occurs
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1 Fig. 1. Model of surface after deformational cutting: (1) ba
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