Development of graded composition CoCrAlY (+ Pt) sputtered coatings

Progress is reported in the development of sputter deposited CoCrAlY-type coatings with Cr and Al concentration gradients through the coating thickness. The objective is to investigate the potential of high Cr coating surface compositions, gradients in Cr and Al composition, and Pt underlayers or graded Pt additions for significantly enhancing lifetimes of gas turbine engines operating on coal-derived liquid (and other alternative) fuels. Sputter coated burner rig test pins representing 15 different combinations of processing variables (including preoxidation heat treatment) sputter coated gas turbine first-stage blades with three different heat treatments, and several sputter coated fluidized bed turbine vanes are discussed along with testing status of these components.