Method for heat treating a preform made of titanium alloy powder

Patent metadata

Field	Value
Publication number	US-10967430-B2
Application number	US-201615741844-A
Country	US
Kind code	B2
Filing date	Jul 6, 2016
Priority date	Jul 6, 2015
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A method for heat treating a powder part preform including a titanium alloy, includes heat treating the preform in a furnace at a predefined temperature, wherein the preform is on a holder during the heat treatment. The holder includes a titanium alloy having a mass titanium content no lower than 45%, or a zirconium alloy having a mass zirconium content no lower than 95%, wherein the material making up the holder has a melting temperature higher than the predefined heat treatment temperature, and an antidiffusion barrier is arranged between the preform and the holder to prevent the preform from becoming welded to the holder.

First claim

The invention claimed is:

1. A method for obtaining a part comprising heat treating a powder part preform of the part to be obtained, the powder part preform comprising a titanium-based alloy, wherein the method comprises performing heat treatment of the powder part preform in a furnace at a predetermined temperature, wherein the powder part preform is on a holder during the heat treatment,
wherein the holder comprises a titanium-based alloy having a titanium content greater than or equal to 45% by weight,
wherein a material of the holder has a melting temperature higher than the predetermined temperature of the heat treatment such that mechanical properties and shape of said holder are unaffected by said predetermined temperature during said heat treatment, and
wherein an anti-diffusion barrier is arranged between the powder part preform and the holder in order to prevent welding of the powder part preform to the holder during said heat treatment.

2. The method according to claim 1 , wherein the holder comprises a titanium-based alloy having a titanium content that is greater than or equal to 90% by weight.

3. The method according to claim 1 , wherein the holder comprises a titanium-based alloy having a titanium content that is greater than or equal to 99% by weight.

4. The method according to claim 1 , wherein the holder comprises a titanium-based alloy selected from among the following: T40, T60, TiAl6V4, and TiAl-48-2-2.

5. The method according to claim 1 , wherein the holder has a thickness of between 0.1 mm and 20 mm.

6. The method according to claim 1 , wherein the anti-diffusion barrier comprises alumina or yttrium oxide.

7. The method according to claim 1 , wherein the method further comprises: stripping the holder, before the heat treatment, to remove an oxide layer formed thereon.

8. The method according to claim 1 , wherein the heat treatment of the powder part preform is sintering of the powder part preform, wherein the predetermined temperature of the heat treatment is the temperature of a sintering step.

9. A method for heat treating a powder part preform of a turbomachine part comprising a titanium-based alloy, wherein the method comprises the method according to claim 1 .

Assignees

• Safran Aircraft Engines
• Alliance

Inventors

• Fribourg Guillaume
• Bihr Jean-Claude
• Gillot Clément

Classifications

• B22F3/10 Primary

  Sintering only · CPC title

• C22C14/00 Primary

  Alloys based on titanium · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• F27D5/00

  Supports, screens or the like for the charge within the furnace · CPC title

• B22F3/1003

  Use of special medium during sintering, e.g. sintering aid · CPC title