In this paper, the solid-liquid composite method is used to prepare the steel-copper bimetal sample through two-stage cooling process (forced air cooling and oil cooling). The relationship between the different microstructures and friction properties of the bimetal copper layer is clarified. The results show that: the friction and wear parameters are 250 N, the speed is 1500 r/min (3.86 m/s), the friction coefficient fluctuates in the range of 0.06-0.1, and the lowest point is 0.06 at 700 °C. The microstructure of the copper layer was α-Cu, δ, CuP, and Pb phases, and Pb was free between α-Cu dendrites. When the solidification temperature is 900 °C, the secondary dendrite of α-Cu develops. With the decrease temperature, the growth of primary and secondary dendrites gradually tends to balance at 700 °C. During the wear process, Pb forms a self-lubricating film uniformly distributed on the surface of α-Cu, and the CuP and δ phases are distributed in the wear mark to increase α-Cu wear resistance.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8779946 | PMC |
| http://dx.doi.org/10.3390/ma15020492 | DOI Listing |
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