Relationship between Microstructure and Properties of HVOF Sprayed Cr_3C_2-NiCr Cermet Coating

摘要

HVOF sprayed Cr_3C_2-25 percent NiCr cermet coatings were deposited by the HVOF spray process. The carbon content, carbide grain size and carbide content were estimated quantitatively. The mechanism of carbon loss in spraying and the effect of carbide grain size on the properties of sprayed coating were examined. The carbon content of the Cr_3C_2-25 percent NiCr cermet coating deposited by HVOF spraying was lower than that of the powder. The carbon loss during particle in-flight was very limited. The main mechanism of carbon loss is probably the rebound-off of large carbide particles.