Component repair materials

Abstract

A composition comprising Ni and the following additional components: (i) Co in an amount in the range from about 4.5 to about 11%; (ii) Cr in an amount in the range from about 7 to about 12%; (iii) Mo in an amount in the range from about 0.5 to about 1.4%; (iv) W in an amount in the range from about 1.8 to about 4.5%; (v) Re in an amount in the range from about 1.0 to about 2.6%; (vi) Al in an amount in the range from about 2.4 to about 5.6%; (vii) Ta in an amount in the range from about 2.4 to about 5.9%; (viii) Hf in an amount in the range from about 0.4% to about 6.0%; (ix) C in an amount up to about 0.1%; (x) B in an amount in the range from 0.2 to about 2.2%; (xi) Zr in the range from to about 0.02%; (xii) Fe in an amount in the range from about 0.07 to about 0.2%; and (xiii) Mn in an amount in the range from about 0.03 to about 0.1% wherein all percentages are by weight based on the total weight of the composition. The composition is particularly suited for braze repair of alloy materials e.g. superalloys in particular single crystal or directionally solidified alloys such as those used in the manufacture of turbine engines of aircraft etc.

Description

FIELD OF THE INVENTION The present invention relates to component repair materials generally, and in particular to the repair of metallic components. Of particular interest are components constructed of alloys (more particularly superalloys) and their repair using suitable repair materials. BACKGROUND OF THE INVENTION Alloys and in particular those alloys which are capable of withstanding great pressures and temperatures are of interest as components formed with these materials are often costly to produce and it is more economical to repair rather than replace them. A well known technique for repairing cracks and other fractures in an article such as a component is brazing. Accordingly there is a need for brazing materials which are suitable for use for repairing components. It is desirable that the material used as a braze results in a repair that restores the component to a useable state. Braze materials and techniques which function well to repair alloys such as for example su...

AI Technical Summary

Benefits of technology

"The present invention provides a composition for repairing articles made of alloy, particularly superalloys such as SC or DS, which comprises Ni and additional components such as Co, Cr, Mo, W, Re, Al, Ta, Hf, C, B, Zr, Fe, and Mn. The composition is in powder form and is useful for repairing turbine components with minimal voiding and a desirable microstructure. The presence of Hf and B in the composition is thought to act as a melting point depressant, causing the repair composition to have a lower melting point than the alloy material being repaired. The method involves heating the repair material and the area to be repaired to a suitable temperature for repair, and may include a secondary heating step to temper the repair. The repaired article will have similar physical properties to the original article."

Problems solved by technology

It has been found that many materials which are suitable for repairing conventional articles / components do not sufficiently well repair SC or DS superalloys.

Such materials have not been repaired sufficiently well with prior art compositions.

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