Blast Erosion Properties of Sintered Ceramics and Sprayed Coatings

Abstract

The final properties of our study is to discuss the selection of surface modification processes and/or materials from a viewpoint of blast erosion properties. In this study, an experimental investigation was carried out on the blast erosion resistance of sintered ceramics and ceramic sprayed coatings. Three different coatings of WC-12Co, Al2O3 and Cr2O3, which were produced by FLSP and PSP, were examined in comparison with the sintered ceramics. The effect of test conditions, such as blast angle and blast particle size, on the erosion resistance were made clear. The better correlation between volume erosion rate and Vickers hardness after erosion could not be obtained from the experimental results. It appears that the blast erosion properties of sintered ceramics and ceramic sprayed coatings may be affected by not only the hardness but also the fracture toughness. It was also confirmed by experiments that the material (process) selection could be easily conducted using the relationship of the erosion resistance between the blast angle 30° and 90°. It made clear that the effect of blast angle on the volume erosion rate of the sintered ceramics and sprayed coatings could be approximately estimated by the assumption of sinΨ (Ψ: blast angle) dependency.