Erosion Wear Behavior of NiCrAl/Al₂O₃-13wt%TiO₂ Coating on Q235 Steel Surface by Plasma Spraying

NiCrAl/Al₂O₃-20wt%TiO₂ compoud coating were prepared on Q235 steel by atmospheric plasma spraying. The micro-morphology and phase structure of the coating were characterized by scanning electron microscopy, X-ray diffraction and energy dispersive spectrometer. The microhardness of the coating was measured. The erosion rates of the coating at 30°, 60° and 90° erosion angles were analyzed. The results show that the maximum erosion rate is 0.4326 mg·mm^-2 at 60°, the smallest is 0.3225 mg·mm^-2 at 30°, and that of 90° erosion angle is 0.3742 mg·mm^-2. The coating has good plastic erosion resistance at 30° erosion angle. The coating has good brittle erosion resistance at 90° erosion angle.