Erosion of High Velocity Oxy-Fuel Sprayed Cr3C2-NiCr Coatings
Ji Gangchang¹£¬Wang Yuyue¹£¬Li Changjiu¹£¬K. Sonoya²
(1.Xi'an Jiaotong University,Xi'an 710049, China£»
2. Ishikwajimaª²Harima Heavy Industries Co. Ltd. Japan)

Abstract: Erosion of high velocity oxy-fuel (HVOF) sprayed CrC3C2-NiCr coatings are studied by investigating the spraying parameters including fuel gas flow, oxygen flow and spraying distance. The surface morphology and the cross section structure of the eroded coatings for different jet angles are examined. The experimental results show that the erosion behavior is similar to that of brittle ceramic materials while the maximum erosion is found to occur at a jet angle of 90 degrees. The successive spalling of splats from the lamellar interface of the coating caused by the impact of erosive particles is the dominant mechanism of erosion.
Keywords: HVOF;CrC3C2-NiCr coatings;erosion;erosive mechanism