Increasing thermal barrier properties. Reducing stress levels and increasing thickness limitations. Increasing shock resisting properties. Abradability in clearance control coatings. Applications in prosthetic devices and nucleate boiling etc.
Most metallic coatings suffer oxidation during normal thermal spraying in air.
The products of oxidation are usually included in the coating. Oxides are generally much harder than the parent metal. Coatings of high oxide content are usually harder and more wear resistant. Oxides in coatings can be detrimental towards corrosion, strength and machinability. Generally the as-sprayed surface is rough and textured.