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AssigneeAnsaldo Energia S.p.A.
InventorsSergio Corcoruto, Tatiana Falcinelli, Fabrizio Casadei
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Alloy composition for the manufacture of protective coatings, comprising cobalt, nickel, chromium, aluminum, yttrium and iridium in amounts so as to obtain the phases α, β and σ, in particular for coating a super-alloy article. Preferably, such super-alloy article is a turbine component.
An alloy composition for the manufacture of protective coatings, the alloy composition comprising, by weight, cobalt in amounts from 10 to 30%, nickel in amounts from 30 to 70%, chromium in amounts from 15 to 20%, aluminum in amounts from 8 to 12%, yttrium in amounts from 0.1% and 2%, and iridium in amounts from 0.5 to 3.5%.
A method of making an alloy composition for the manufacture of protective coatings in powder form wherein the composition comprises by weight from 10% to 30% of cobalt, from 30% to 70% of nickel, from 15% to 20% of chromium, from 8% to 12% of aluminum, from 0.1% to 2% of yttrium and from 0.5% to 3.5% of iridium wherein the method comprises an atomization process carried out directly on the alloy in molten state.
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Coating with metallic material characterised only by the composition of the metallic
By casting, e.g. through sieves or in water, by atomising or spraying: atomising using a fluid
With chromium: without Mo and W
Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00: alloys based on chromium
About 2 years 1 month of term left · ends 4 Dec 2028 (estimated)
The present invention relates to an alloy composition for the manufacture of protective coatings, its use, process for application and super-alloy articles coated with the same composition.
It is known that the performance of gas turbines, in terms of efficiency and obtainable power, are intrinsically bound to the maximum temperature of the thermodynamic cycle, that is to the temperature of the hot gases in contact with the metallic walls of its elements, in particular turbine vanes of the first rotor and stator stage.
The super-alloys used in the construction of elements exposed to high temperature are therefore stressed to their technological limits and are consequently subject to processes of oxidation, corrosion and erosion made continuously more taxing by the increasingly high running temperature and use of lower quality fuels.
In the accompanying drawings:
FIGS. 1 and 2 show the SEM micrographs of the four coatings made in the Examples;
FIGS. 3 and 4 show microstructural details of one of the four coatings made in the Examples; and
Preparation of the coating composition in powder form.
The pulverisation step comprises a first manufacturing step of the master alloy ingots and the subsequent steps of re-melting and atomising the master alloy in an atomisation gas system.
The master alloy ingots are made using a vacuum induction oven. The VIM (Vacuum Induction Melting) technology is the most versatile melting process for the production of nearly all Fe, Ni and Co based special alloys, and is also the only allowed for some aeronautic applications, not only for the production of ingots but also of castings.