NICKEL-ALUMINIUM INTERMETALLIC BASIS ALLOY

摘要

A nickel-aluminium intermetallic basis alloy has a structure mainly made of the binary phase NiAl and further contains the elements chromium and tantalum. The total proportion of the elements chromium and tantalum amounts to maximum 12 % by atoms. The preferable content ranges lie from 0.3 to 3.8 % by atoms tantalum and from 1.0 to 9.0 % by atoms chromium. The nickel-aluminium intermetallic basis alloy is characterised in particular by a high oxidation resistance at high temperatures, such as 1350 DEG C. It is therefore suitable for producing pieces exposed to a high and continuous thermal stress, such as gas turbine blades. This high oxidation resistance allows additional anti-oxidation layers to be dispensed with.