The quality of any thermal spray (TS) coating depends on the initial feedstock material. No technical procedure can correct for a poor-quality powder. Coatings are formed from the repeated deposition of molten and semimolten feedstock particles. The resulting lamellar dimensions are approximately 60 µm in diameter and from 1 to 4 µm thick. Metallographic characterization of coatings is often used as a basis for determining the suitability of the initial feedstock. Advanced analytical techniques involving image analysis and statistical quantification of the coating microstructure are also used to ensure quality control.
Handbook of thermal spray technology / J. R. Davis (ed.),