Patent ID: 6080246
Filing Date: 2000-06-27
Classification: C23C

Abstract:
A method of aluminising a high rhenium containing superalloy comprising the steps of:(a) modifying the surface of the high rhenium containing superalloy by applying a layer of chromium or cobalt to the surface of the high rhenium containing superalloy and heat treating to diffuse the chromium or cobalt into the high rhenium containing superalloy to reduce the rhenium content of the surface of the high rhenium containing superalloy, and(b) aluminising the high rhenium containing superalloy to form an aluminide coating,wherein the high rhenium containing superalloy comprises at least 3.5 wt % rhenium;wherein any subsequent formation of topologically close packed phases is substantially prevented by said modifying of the surface of the high rhenium containing superalloy.