Solid particle erosion behavior of HVOF/HVAF sprayed WC-Co-Cr coatings

Abstract

The erosion behavior of three WC-Co-Cr coatings obtained by high velocity oxy-fuel/air-fuel (HVOF/HVAF) thermal spray systems has been investigated using Al₂O₃ as erodent at four impingement angles (15°, 45°, 75°, 90°) and 90 m/s impact velocity. The results indicate that the micro-cutting and coatings spallation are main erosion mechanisms for coatings, and the proportion of the two mechanisms changes depending on the impingement angle. The ranking of the coatings in terms of erosion resistance is very much dependent on the microstructure of coatings. The behavior of formation and propagation of cracks also depends on the microstructure of coatings, and has been understood in terms of schematic diagrams.

Keywords

Erosion behavior WC-Co-Cr coatings erosion mechanisms cracks microstructure

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