Metallic alloy composition and protective coating
AssigneeUnited Technologies Corporation
InventorsMelvin Freling, Kevin W. Schlichting
Life of this patent
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Abstract
A protective coating system includes a coating having a composition that includes about 5-40 wt % of chromium, of about 5-35 wt % of aluminum, about 0.1-9 wt % of at least one of silicon, hafnium, or magnesium, about 0.05-2 wt % of a Group IIIB Periodic Table element, a non-zero amount less than 13 wt % of at least one noble metal selected from platinum, palladium, and gold, and a balance including nickel, cobalt or iron.
Claims19
A protective coating system comprising:
- a protective layer having a composition including:
- about 5-40 wt % of chromium,
- about 5-35 wt % of aluminum,
- about 0.1-9 wt % of at least one of silicon, hafnium, or magnesium,
- about 0.05-2 wt % of a Group IIIB Periodic Table element,
- a nonzero amount less than 13 wt % of at least one noble metal comprising gold, and
- a balance including at least one of nickel, cobalt, or iron.
An alloy composition comprising:
- about 5-40 wt % of chromium;
- about 5-35 wt % of aluminum;
- about 0.1-9 wt % of at least one of silicon, hafnium, or magnesium;
- about 0.05-2 wt % of a Group IIIB Periodic Table element;
- a nonzero amount less than 13 wt % of at least one noble metal comprising gold;
- and
- a balance including at least one of nickel, cobalt, or iron.
A method of manufacturing a protective coating system, comprising:
- forming a protective layer having a composition including about 5-40 wt % of chromium, about 5-35 wt % of aluminum, about 0.1-9 wt % of at least one of silicon, hafnium, or magnesium, about 0.05-2 wt % of a Group IIIB Periodic Table element, a nonzero amount less than 13 wt % of at least one noble metal selected from platinum, palladium, and gold, and a balance including at least one of nickel, cobalt, or iron, by thermal spraying a first powder having a nominally equivalent composition to the composition of the protective layer but excluding the at least one noble metal and a second powder comprising the at least one noble metal, including forming an intermediate layer having the composition excluding the at least one noble metal, depositing a diffusion layer on the intermediate layer, where the diffusion layer comprises the at least one noble metal, and heating the intermediate layer and the diffusion layer to diffuse the at least one noble metal into the intermediate layer to form the protective layer.
A method of manufacturing a protective coating system, comprising:
- forming a protective layer having a composition including about 5-40 wt % of chromium, about 5-35 wt % of aluminum, about 0.1-9 wt % of at least one of silicon, hafnium, or magnesium, about 0.05-2 wt % of a Group IIIB Periodic Table element, a nonzero amount less than 13 wt % of at least one noble metal selected from platinum, palladium, and gold, and a balance including at least one of nickel, cobalt, or iron, by thermal spraying a first powder having a nominally equivalent composition to the composition of the protective layer but excluding the at least one noble metal and a second powder comprising the at least one noble metal, or by thermal spraying a powder having particles with having a nominally equivalent composition to the composition of the protective layer, including thermally spraying in nitrogen at 130+/−20 psig, oxygen at 165+/−20 psig, and hydrogen at 135+/−20 psig.
Dependencies are inferred from the claim text.