Peened overlay coatings

摘要

Disclosed are coatings which are improved by a special peening process. Uniform sized spherical steel shot, in the range 1-2.5 mm is impacted at uniform low velocities onto a coated workpiece. Peening intensities are in the range 0.30-0.60 mm N. MCrAlY high temperature coatings are particularly improved, with densities of the order of 99 percent. Physical vapor desposited coatings have surface finishes of the order of 30x10-6 inch AA (Arithmetic Average) and plasma sprayed coatings have finishes of the order of 100x10-6 inch AA compared to unpeened finishes of 50-60x10-6 inch AA and 200-300x10-6 AA respectively.