High-temperature protective layer for titanium aluminide alloys
AssigneeMTU Aero Engines AG
InventorsMartin Schloffer, Heiko Warnecke
Life of this patent
Estimating the term…
Abstract
Disclosed is a process for coating a component of a TiAl alloy in order to improve the high-temperature resistance of the component. The process comprises depositing a Pt- and Cr-free protective layer alloy comprising Ti, Al, Nb, Mo and B and optionally one or more of W, Si, C, Zr, Y, Hf, Er and Gd on the component by physical vapor deposition at a temperature of less than or equal to 600° C. The protective layer alloy has a higher Al content than the TiAl alloy of the component. A coated component made by this process is also disclosed.
Claims20
A process for coating a component of a TiAl alloy in order to improve the high-temperature resistance of the component, wherein the process comprises depositing on the component by physical vapor deposition at a temperature of less than or equal to 600° C. a Pt- and Cr-free protective layer TiAl alloy comprising
- Al
- from 57 to 65 at. %,
- Nb
- from 3 to 6 at. %,
- Mo
- from 0.2 to 2 at. %,
- B
- from 0.05 to 0.2 at. %,
- W
- from 0 to 3 at. %,
- Si
- from 0 to 0.5 at. %,
- C
- from 0 to 0.6 at. %,
- Zr
- from 0 to 6 at. %,
- Y
- from 0 to 0.5 at. %,
- Hf
- from 0 to 0.3 at. %,
- Er
- from 0 to 0.5 at. %,
- Gd
- from 0 to 0.5 at. %
- and titanium as balance, the protective layer TiAl alloy having a higher Al content than the TiAl alloy of the component.
A component having a base material of a TiAl alloy, wherein the component comprises an oxidation protection coating which is arranged on at least part of a surface of the component and is composed of a Pt- and Cr-free protective layer TiAl alloy comprising
- Al
- from 57 to 65 at. %,
- Nb
- from 3 to 6 at. %,
- Mo
- from 0.2 to 2 at. %,
- B
- from 0.05 to 0.2 at. %,
- W
- from 0 to 3 at. %,
- Si
- from 0 to 0.5 at. %,
- C
- from 0 to 0.6 at. %,
- Zr
- from 0 to 6 at. %,
- Y
- from 0 to 0.5 at. %,
- Hf
- from 0 to 0.3 at. %,
- Er
- from 0 to 0.5 at. %,
- Gd
- from 0 to 0.5 at. %
- and titanium as balance, which alloy has a higher Al content than the TiAl alloy of the component.
Dependencies are inferred from the claim text.