Patent ID: 7736704
Filing Date: 2010-06-15
Classification: C23C

Abstract:
1. A process for applying a protective layer resistant to high-temperature corrosion and high-temperature erosion to a base metal layer, the process comprising: applying an adhesive layer composed of an MCrAlY alloy to the base metal layer; coating the adhesive layer with an Al diffusion layer by alitizing; subjecting the diffusion layer to an abrasive treatment, so that the outer built-up layer of the diffusion layer produced by alitizing is at least partially removed by the abrasive treatment; and applying a ceramic heat insulation layer, consisting essentially of zirconium oxide, which is partially stabilized by yttrium oxide, to the diffusion layer, the diffusion layer including a diffusion zone proper with an Al content of about 20% and an outer built-up layer with an Al content of about 30% prepared by the alitizing, and the outer built-up layer of the diffusion layer, which is located above the diffusion zone proper, being removed by the abrasive treatment to the extent that the Al content in the surface of the remaining diffusion layer exceeds 18% and is lower than 30%.