Isothermal Oxidation of Cr₃C₂-NiCr Coatings Sprayed by High Velocity Techniques Available to Purchase

This paper investigates the oxidation behavior of HVAF and HVOF sprayed Cr₃C₂-NiCr coatings under isothermal conditions. Over the range of 700 to 900 °C, all HVAF coating-only samples showed initial rapid mass gain before levelling off in a manner indicative of the formation of a protective oxide layer. The kinetics of the process were complex and did not conform to linear, parabolic, or logarithmic rate laws. The HVOF coatings exhibited a similar response. Where variations and anomalies are observed, they are attributed to differences in microstructure, composition, and spraying equipment. Paper includes a German-language abstract.