MCrAlY-coating
AssigneeALSTOM Technology Ltd
InventorsAlexander Schnell, Cyrille Bezencon, Matthias Hoebel, Abdus Suttar Khan, Maxim Konter, Wilfried Kurz
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Abstract
A gas turbine component consists of a superalloy base material with a single crystal structure and a protective MCrAlY-coating (6). The MCrAlY-coating (6) has a g/g′ single crystal structure, which is epitaxial with the base material. It has be determined the critical factors for the successful epitaxial and crack-free growth of the MCrAlY-coating (6).
Claims14
An article having a surface and a single crystal structure, the article coated with protective MCrAlY-coating epitaxially grown on the surface of the article, wherein the MCrAlY-coating has a solidification temperature interval (ΔT0) of smaller than 30° C. and a temperature interval (ΔT1) of the last 5% liquid of smaller than 15° C., and wherein the MCrAlY has a γ/γ′-structure and the MCrAlY comprises less than 1.2 wt. % Si.
An article having a surface and a single crystal structure, the article coated with protective MCrAlY-coating epitaxially grown on the surface of the article, wherein the MCrAlY has a γ/γ′-structure and has the following chemical composition (wt. %):
- 25 Cr, 6 Al, 0.4 Y, less than 1.2 wt. % Si, balance Ni and unavoidable impurities.
An article having a surface and a single crystal structure, the article coated with protective MCrAlY-coating epitaxially grown on the surface of the article, wherein the MCrAlY has a γ/γ′-structure and has the following chemical composition (wt. %):
- 16.5 Cr, 5.5 Al, 0.4 Y, less than 1.2 wt. % Si, balance Ni and unavoidable impurities.
Dependencies are inferred from the claim text.