Abstract

The mechanisms of formation of macro- and microsegregation in HVOF sprayed coatings are discussed. Macrosegregation is shown to be developed mostly due to in-flight mass transfer in the powder particles while microsegregation is formed mainly during solidification of the coating. The variations of chemical inhomogeneity with respect to the parameters of powder particles and spraying (particle size, density, morphology, fluid temperature, etc.) are established. The results obtained agree well with the observed tendencies for the formation of chemical inhomogeneity.

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