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Study of fracture and erosive wear of plasma sprayed coatings

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Abstract

Double cantilever beam (DCB) and short bar (SB) specimens were used to determine the critical strain energy release rate (G IC) of plasma-sprayed coatings ofZrO 2-base ceramic and WC-Co coatings. Erosion rates were measured for various erosive conditions. By comparing theG Ic data and erosion rate (E v) data with X- ray diffraction and fractographic analysis, fracture and erosion mechanisms of plasma-sprayed coatings were proposed. Based on the erosion models for brittle materials, a proportional relationship between the erosion rate,E v, andG IC was derived as follows:

$$E_v \propto \left( {\frac{1}{H}} \right)^{{1 \mathord{\left/ {\vphantom {1 4}} \right. \kern-\nulldelimiterspace} 4}} \times \left( {G_{IC} } \right)^{ - {2 \mathord{\left/ {\vphantom {2 3}} \right. \kern-\nulldelimiterspace} 3}} $$
(1)

whereH is hardness. An increase inG IC leads to a decrease inE v. The exponent value of -2/3 ofG IC was confirmed by the experimental data.

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Authors and Affiliations

  1. Department of Materials Engineering, Xian Jiaotong University, Xi’an, China

    D. Z. Guo & L. J. Wang

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  1. D. Z. Guo
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  2. L. J. Wang
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Guo, D.Z., Wang, L.J. Study of fracture and erosive wear of plasma sprayed coatings. JTST 2, 257–263 (1993). https://doi.org/10.1007/BF02650474

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