Preparation and high temperature oxidation properties of plasma-spray TiB2-Co composite coatings

چکیده مقاله

In this study, TiB2-Co composite coatings were thermally sprayed on the surface of 304 stainless steel substrate by atmospheric plasma spray. Structural evolution of powder particles and the Plasma sprayed coatings was investigated by X-ray diffractometry (XRD). The morphology of powder particles and microstructure of the coatings were studied by scanning electron microscopy (SEM). Average particle size and flow ability of feedstock were measured. Both coatings possess typical lamellar and dense structure and also high quality contact with the substrate. Oxidation behavior of the coatings was studied at 900 °C in atmospheric environment. The composition and morphology of the oxidized surface were analyzed. Investigation shows the oxidation layer performed in a parabolic oxidation rate. The kinetics curves of isothermal oxidation of the coatings illustrates a short transient stage from rapid to slow during early hours of oxidation experiment. Moreover, the oxidation rates of the coatings are significantly smaller than substrate.

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