Research on Tribological Properties of WC-Co / NiCrBSi Composite Coatings Prepared by HVOF and APS at Elevated Temperature

doi:10.3969/j.issn.1000-1093.2013.09.009

Abstract

Abstract:

WC-Co/ NiCrBSi composite coatings were prepared on the surface of aluminium alloy 7005 by high velocity oxygen-fuel flame (HVOF) spray and atmosphere plasma spray (APS), respectively. The microstructures of the composite coatings are analyzed, and the tribological behavior and mechanisms of the composite coatings at elevated temperature are researched. The results show that the porosity of the composite coatings prepared by HVOF is only 28. 9% of that prepared by APS. The microhardness of the composite coatings prepared by HVOF is 838. 4HV0. 5, and the thicknesses of Al and Ni diffusion layers are 13. 17 μm and 12. 55 μm, respectively, which are all higher than those of the composite coatings prepared by APS. The composite coatings prepared by HVOF have low friction coefficient and wear loss compared with the composite coatings prepared by APS. At room temperature of 25 ℃, the wear mechanisms of the composite coatings prepared by HVOF are micro-cutting wear and slight fatigue wear, and the composite coatings prepared by APS experience fatigue fracture wear. At elevated temperature of 400 ℃, the wear mechanisms of the former change into multi-plastic deformation wear and oxidative wear, and those of the latter turn into severe adhesive wear and oxidative wear.

Key words: composite material, high veloeity oxygen-fuel flame, atmosphere plasma spray, composite coating, microstructure, elevated temperature, abrasive wear

CLC Number:

TG174. 44

Institute of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China. Research on Tribological Properties of WC-Co / NiCrBSi Composite Coatings Prepared by HVOF and APS at Elevated Temperature[J]. Acta Armamentarii, 2013, 34(9): 1109-1115.

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