Experimental comparison of CuAl10Fe3 journal bearings sliding against two different coatings

Abstract

Purpose The purpose of this paper is to study the frictional behaviors of CuAl10Fe3 journal bearings sliding against chromium electroplated 42CrMo shafts and diamond-like carbon-coated 42CrMo shafts, respectively, under two different conditions and to compare the two kinds of friction pairs. Design/methodology/approach All journal bearing samples underwent 24 h running-in and repeatability verification. Then, the journal bearing friction experiments were carried out under two different conditions. After testing, the torques, friction coefficients, power consumptions and other parameters were obtained. Findings The pair of CuAl10Fe3 journal bearing and diamond-like carbon–coated shaft could drive greater load to start up than the pair of CuAl10Fe3 journal bearing and chromium electroplated 42CrMo shaft, but it had greater power consumption during the steady running period under the identical condition. With the changing of specific pressure or rotational speed, the friction coefficients had different variations. The frictional oscillations appeared at 32 rotations per minute under heavy loads for both kinds of pairs, the oscillation frequencies were equal to rotational frequency of the test shaft and the oscillation amplitude for diamond-like carbon coating was much greater. Originality/value These results have guiding significance for practical industrial applications.

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“…Wang et al from the China University of Geosciences measured the friction coefficients of PDC bearings under different operating conditions and proposed a theoretical model for friction measurement (Wang et al, 2020). X. Wang et al from Shanghai Jiaotong University studied the load bearing and lubrication performance of CuAl 10 Fe 3 sliding bearings under chromium plating and diamond-like carbon coating by comparing the torque and friction coefficient parameters (Wang et al, 2019). The afore-mentioned tests were conducted by directly simulating the friction state of the friction pair to study their tribological properties.…”