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US 8,708,646 B2Granted
MCrAlY alloy, methods to produce a MCrAlY layer and a honeycomb seal
AssigneeSiemens Aktiengesellschaft
InventorsDavid Fairbourn, Paul Mathew Walker
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Abstract
A MCrAlY alloy, methods to produce a MCrAlY layer and a honeycomb seal are provided. The MCrAlY alloy includes chromium, aluminum, yttrium and iron and optionally titanium, hafnium or silicon. The honeycomb seal includes a substrate, honeycomb cells and a protective coating on side walls of the honeycomb cells or a diffusion area inside side walls of the honeycomb cells, the protective coating or the diffusion area including the MCrAlY alloy.
Claims19
A MCrAlY alloy, comprising (in wt%):
- an M-based metallic substrate configured to define part of a honeycomb seal;
- Cr and Al and Y material applied to the substrate;
- and
- a diffusion zone within the M-based metallic substrate and comprising MCrAlY formed by diffusion of the Cr and Al and Y into the substrate, the MCrAlY comprising;
- 18% - 35% chromium (Cr);
- 3% - 15% aluminum (Al);
- and
- 0.2% - 2% yttrium (Y),
- wherein M is iron (Fe)-,
- wherein the MCrAlY alloy comprises at least a first effective amount of hafnium (Hf) for enhancing an oxidation behavior of the alloy and/or at least a second effective amount of silicon (Si) for enhancing an oxidation behavior of the MCrAlY alloy.
7 more elements
A method to form a diffusion area inside a M-based metallic material, comprising:
- forming a honeycomb cell comprising an M-based metallic material;
- and
- obtaining the diffusion area comprising MCrAlY and within the M-based metallic material by exposing the honeycomb cell to alloying elements Cr, Al, and Y,
- wherein M is Ni, Co, or Fe,
- wherein at least a first effective amount of hafnium (Hf) and/or at least a second effective amount of silicon (Si) is diffused into the diffusion area for enhancing an oxidation behavior of the formed MCrAlY alloy.
2 more elements
A honeycomb seal, comprising:
- an M-based metallic substrate forming honeycomb cells;
- Cr, Al, and Y applied to the substrate, and
- a diffusion zone inside side walls of the honeycomb cells,
- wherein the diffusion zone comprises an MCrAlY alloy,
- wherein the MCrAlY comprises:
- 18% - 35% chromium (Cr);
- 3% - 15% aluminum (Al);
- and
- 0.2% - 2% yttrium (Y), and
- wherein the M in the M-based metallic substrate and in the MCrAlY alloy is iron (Fe),
- wherein the MCrAlY alloy comprises at least a first effective amount of hafnium (Hf) for enhancing an oxidation behavior of the alloy and/or at least a second effective amount of silicon (Si) for enhancing an oxidation behavior of the MCrAlY alloy.
8 more elements
Dependencies are inferred from the claim text.