Patent ID: 6102656
Filing Date: 2000-08-15
Classification: C23C,F01D,F05D,Y02T,Y10S,Y10T

Abstract:
A segmented abradable sealing system having enhanced abradability, the system comprising:a duct segment including:a metallic substrate;a MCrAlY bond coat on the substrate; anda segmented abradable ceramic coating on the MCrAlY bond coat, said segmented abradable ceramic coating consisting essentially of three ceramic layers which include:i) a base coat foundation layer deposited on the bond coat, said base coat foundation layer comprising a ceramic layer of material selected from the group consisting of zirconia stabilized with ceria, zirconia stabilized with magnesia, zirconia stabilized with calcia, zirconia stabilized with yttria and mixtures thereof,ii) an interlayer deposited on the base coat foundation layer, andiii) an abradable top layer deposited on the interlayer, said abradable top layer comprising zirconia,wherein said interlayer is a compositional blend of the base coat foundation layer and the abradable top layer,said segmented abradable ceramic coating having at least four vertical microcracks per inch, wherein the three ceramic layers are deposited in one continuous spray process using powder particles which are spherical and hollow for increased abradability; anda cooperating interacting turbine component having an abrasive coating on a portion thereof such that said abrasive coating can interact with said segmented abradable coating to provide sealing.