Mechanical and tribological properties of plasma-sprayed Cr3C2-NiCr, WC-Co, and Cr2O3 coatings |
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Authors: | Y Zhang J Li J Huang C Ding |
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Affiliation: | (1) Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Rd., 200050 Shanghai, PR China |
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Abstract: | Mechanical properties such as Young’s moduli and fracture toughness of plasma-sprayed Cr3C2-NiCr, WC-Co and Cr2O3 coatings were measured. The tribological properties of the three kinds of coatings were investigated with a block-on-ring
self-mated arrangement under water-lubricated sliding. Furthermore, the influences of the mechanical properties on the tribological
properties of the coatings were also examined. It was found that the Young’s moduli, bend strengths and fracture toughness
of the coatings were lower than the corresponding bulk materials, which may be attributed to the existence of pores and microcracks
in the coatings. Among the three kinds of coatings, the magnitude of wear coefficients, in decreasing order, is Cr3C2-NiCr, WC-Co and Cr2O3, and the wear coefficient of Cr2O3 coating was less than 1 × 10−6mm3N−1m−1. The wear mechanisms of the coatings were explained in terms of microcracking and fracturing, and water deteriorated wear
performance of the coatings. The higher the fracture toughness and the lower the porosity and length of microcracking of the
coating, the more the wear-resistance of the coating. |
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Keywords: | Cr3C2-NiCr Cr2O3 fracture toughness triological property WC-Co Young’ s modulus |
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