Yu Suyuan

Performance in Resistance to Surface Fatigue for Cr3C2–25%NiCr Coatings by Plasma Spray and CDS Spray

Three Cr3C2–25%NiCr coatings, prepared by Air Plasma Spray (APS)-Ar/H2, APS-Ar/He and Continuous Detonation Spraying CDS, have been tested on a double-point-contact fatigue-test machine to examine their surface fatigue limit. Results show that the CDS coating exhibits the best performance in resistance to contact fatigue, while the other two coatings tested in our study are unacceptable as fatigue-resistant materials. On the basis of SEM observations, different failure mechanisms for the coatings are suggested. The fatigue limit of the Cr3C2–25%NiCr coatings decreases with the reduction of coating thickness, and the causes for the phenomenon have been discussed.