MCrAIX coating with different chrome and aluminium contents

摘要

In a coating system with a substrate and a 2-layer MCrAlX (chromium (Cr)-aluminum (Al) alloy) coating, the outer MCrAlX layer has (a) lower Cr content and higher Al content than the inner MCrAlX layer and/or (b) if X is at least partially yttrium (Y), lower Y content than the inner layer. M and X are not defined in the main claims; in the disclosure M is iron, cobalt and/or nickel and X is Y, silicon, rare earth metal(s) and/or hafnium; in a dependent claim X may also be rhenium.