Nickel alloy composition

Abstract

A nickel alloy composition, having particular utility for forming an oxidation resistant blade tip on a turbine blade, preferably has a composition substantially as defined by the nominal composition Cr 4.5 wt %; Al 6 wt %; Co 4 wt %; Ta 6 wt %; Re 4 wt %; Hf 0.15 wt %; C 0.05 wt %; Si 0.1 wt %; B 0.005 wt %; W 2 wt %; La 0.003-0.005 wt %; and Y 0.003 to 0.005 wt %; the remainder being nickel.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a nickel alloy composition. In particular, the invention relates to a nickel alloy composition for application to the tips of gas turbine blades to act as an oxidation and corrosion resistant barrier. BACKGROUND OF THE INVENTION [0002] U.S. Pat. No. 5,622,638 (Schell et al; 22 Apr. 1997), the disclosure of which is incorporated herein by reference, describes a nickel-based alloy composition for application to the tips of gas turbine blades (which are conventionally formed from a nickel-based superalloy) to act as an oxidation and corrosion resistant barrier, most particularly a high temperature oxidation and corrosion resistant barrier. The nickel-based alloy composition consists essentially of about 14 to about 18 wt % Cr, about 6.45 to about 6.95 wt % Al, about 9.75 to about 11.45 wt % Co, about 5.95 to about 6.55 wt % Ta, about 1.85 to about 2.35 wt % Re, about 0.05 to about 1.75 wt % Hf, about 0.006 to about 0.03 wt ...

AI Technical Summary

Benefits of technology

[0018] The laser cladding process is particularly shape-faithful, making available shaping accuracies of +/−0.04 mm in the laying down of the alloy of the present invention. Where the confi

Problems solved by technology

These elements are found generally to harm the resistance

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