Microstructure Characterization and Tribological Properties Evaluation on WC/Cu Composite Coating Prepared by Supersonic Laser Deposition

doi:10.3901/JME.2020.10.078

Abstract

Abstract: Pure copper has good conductivity of heat and electricity, but low hardness and poor wear resistance. Therefore, the WC/Cu composite coatings are prepared on the surface of copper substrate by supersonic laser deposition (SLD) and cold spray (CS). The microstructure, phase composition, microhardness and wear property of the as-prepared coatings are comparatively analyzed for these two technologies. The results show that the thickness of CS coating is about 1 128 μm, the WC content is 7.73% and the microhardness is 147.4 HV_0.2, but there are some gaps at the coating/substrate bonding zone. For SLD coating, the thickness increases with elevating laser power. The thickest coating thickness is up to 2 344 μm, the highest WC content is 17.22% and the highest microhardness reaches 161.3 HV_0.2. All SLD coatings show well-bonded coating/substrate interface. The SLD coating still retains the original phase composition of the feedstock powder. However, samples prepared at high laser power experienced slight oxidation. The wear resistance of the SLD coating is superior to that of the CS coating and Cu substrate, with lower coefficient of friction, wear scar width and wear loss. These results provide a new route for improving the surface properties of Cu and its alloys.

Key words: supersonic laser deposition, WC/Cu composite coatings, solid-state deposition, microstructure, microhardness, wear-resistance

CLC Number:

TG146

HUANG Xuanjie, WU Lijuan, LI Bo, WANG Weilin, ZHANG Qunli, VOLODYMYR S. Kovalenko, YAO Jianhua. Microstructure Characterization and Tribological Properties Evaluation on WC/Cu Composite Coating Prepared by Supersonic Laser Deposition[J]. Journal of Mechanical Engineering, 2020, 56(10): 78-85.

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