Method for applying a titanium aluminide alloy, titanium aluminide alloy and substrate comprising a titanium aluminide alloy

Patent metadata

Field	Value
Publication number	US-11692273-B2
Application number	US-201816770074-A
Country	US
Kind code	B2
Filing date	Dec 6, 2018
Priority date	Dec 7, 2017
Publication date	Jul 4, 2023
Grant date	Jul 4, 2023

Abstract

A method applies a titanium aluminide alloy on a substrate. The titanium aluminide alloy has a gamma phase proportion of at least 50% based on an overall composition of the titanium aluminide. The method includes: pretreating a surface of the substrate; heat treating titanium aluminide powder particles at a temperature range of 600° C. to 1000° C. to increase the proportion of the gamma phase; cold spraying the heat-treated powder particles onto the substrate or a part of the substrate to form a layer of titanium aluminide; and thermally post-treating the layer of titanium aluminide applied to the substrate.

First claim

The invention claimed is:

1. A method for applying a titanium aluminide alloy on a substrate, the titanium aluminide alloy comprising a gamma phase proportion of at least 50% based on an overall composition of the titanium aluminide, the method comprising:
pretreating a surface of the substrate;
heat treating titanium aluminide powder particles at a temperature range of 600° C. to 1000° C. to increase the proportion of the gamma phase;
cold spraying the heat-treated powder particles onto the substrate or a part of the substrate to form a layer of titanium aluminide; and
thermally post-treating the layer of titanium aluminide applied to the substrate.

2. The method according to claim 1 , wherein the gamma phase proportion of the titanium aluminide alloy is at least 55% based on the overall composition of the titanium aluminide alloy.

3. The method according to claim 1 , wherein the substrate surface comprises a titanium aluminide alloy, a nickel alloy, a titanium alloy, or combinations thereof.

4. The method according to claim 1 , wherein the pretreatment of the substrate surface comprises polishing, roughness blasting, high pressure water blasting, chemical etching, or combinations thereof.

5. The method according to claim 1 , wherein the heat treatment of the powder particles is carried out in a protective gas atmosphere or in a vacuum.

6. The method according to claim 1 , wherein the heat treatment is carried out for a period of 0.5 hours to 5 hours.

7. The method according to claim 1 , wherein the heat treatment is carried out in a temperature range from 620° C. to 900° C., and
wherein the cold spraying the heat-treated powder particles comprises:
using a carrier gas, conveying the heat-treated powder particles toward the substrate, the carrier gas comprising nitrogen or a mixture of nitrogen and helium, the carrier gas being pre-heated to a temperature of 700° C. to 1200° C., and the carrier gas being provided at a pressure from 40 to 50 bar.

8. The method according to claim 1 , wherein the heat treatment is carried out for 1 hour to 3 hours, in a protective gas atmosphere or in a vacuum of less than 10 −5 mbar, and in a temperature range of 650° C. to 850° C.

9. The method according to claim 1 , wherein a size of the powder particles is in a range from 10 μm to 70 μm.

10. The method according to claim 1 , wherein an average powder particle diameter is less than 45 μm.

11. The method according to claim 1 , wherein the powder particles are spherical.

12. The method according to claim 1 , wherein the thermally post-treating the layer of titanium aluminide applied to the substrate comprises a hot isostatic pressing or a diffusion annealing.

13. The method according to claim 1 ,
wherein the titanium aluminide alloy comprises the gamma phase and an alpha2 phase, and
wherein a ratio of the gamma phase to the alpha2 phase in the titanium aluminide alloy is in a range from 50:50 to 99:1.

14. The method according to claim 1 , wherein the gamma phase proportion of the titanium aluminide alloy is at least 60% based on the overall composition of the titanium aluminide alloy.

15. The method according to claim 1 , wherein the gamma phase proportion of the titanium aluminide alloy is 80% based on the overall composition of the titanium aluminide alloy.

16. The method according to claim 1 , wherein the heat treatment is carried out in a temperature range from 650° C. to 850° C.

17. The method according to claim 13 , wherein the ratio of the gamma phase to the alpha2 phase in the titanium aluminide alloy is in a range from 55:45 to 90:10.

18. The method according to claim 13 , wherein the ratio of the gamma phase to the alpha2 phase in the titanium aluminide alloy is in a range from 60:40 to 80:20.

Assignees

• Lufthansa Technik Ag

Inventors

• Peters Jan Oke
• Gartner Thomas Maria
• Mecklenburg Matthias
• Rackel Marcus Willi
• Bakan Emine
• Mauer Georg

Classifications

• C22C14/00

  Alloys based on titanium · CPC title

• C23C24/087 Primary

  Coating with metal alloys or metal elements only · CPC title

• C22F1/183

  of titanium or alloys based thereon · CPC title

• C23C24/08 Primary

  by application of heat or pressure and heat (C23C24/04 takes precedence) · CPC title

• C23C24/106

  Coating with metal alloys or metal elements only · CPC title