Composition for fabricating parts out of titanium aluminide by sintering powder, and a fabrication method using such a composition

Patent metadata

Field	Value
Publication number	US-10995389-B2
Application number	US-201615573043-A
Country	US
Kind code	B2
Filing date	May 11, 2016
Priority date	May 21, 2015
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A composition for sintering to fabricate a part comprising an alloy based on titanium aluminide, the composition including a powder of an alloy based on titanium aluminide, and an addition powder including a mixture of a metallic aluminum powder and of a metallic titanium powder. The composition includes 0.5% to 5% by weight of addition powder.

First claim

The invention claimed is:

1. A composition for sintering to fabricate a part comprising an alloy based on titanium aluminide, the composition comprising a powder of an alloy based on titanium aluminide, and an additive powder comprising a mixture of a metallic aluminum powder and a metallic titanium powder, wherein the composition includes 0.5% to 2% by weight of the additive powder, wherein the Ti/Al atomic ratio of the additive powder lies in the range 0.7 to 1.3.

2. A composition according to claim 1 , wherein the powder of titanium aluminide based alloy has a mean grain size lying in the range 1 μm to 100 μm.

3. A composition according to claim 1 , wherein the additive powder presents a mean grain size identical to that of the powder of titanium aluminide based alloy.

4. A composition according to claim 1 , wherein the powder of titanium aluminide based alloy comprises a titanium aluminide having a content by weight of titanium greater than or equal to 45% and a content by weight of aluminum greater than or equal to 40%.

5. A composition according to claim 1 , wherein said composition has an initial sintering temperature of 660° C.

6. A method of fabricating a part comprising titanium aluminide, the method comprising:
preparing a composition according to claim 1 ; and
sintering the composition.

7. A method according to claim 6 , further comprising, before the sintering, shaping the composition in order to obtain a preform of the part to be fabricated.

8. A method according to claim 7 , wherein shaping the composition comprises:
injecting a mixture of the composition and a binder into a mold in order to obtain a blank of the part to be fabricated; and
debinding the blank in order to obtain the preform of the part to be fabricated.

9. A method according to claim 6 , wherein the sintering is performed:
in a temperature-regulated oven;
by flash sintering;
by selective sintering on a powder bed; or
by hot isostatic pressing.

10. A method according to claim 6 , wherein the sintering is performed under an inert atmosphere of argon.

11. A method according to claim 6 , wherein the part to be fabricated is a part for aviation.

Assignees

• Safran Aircraft Engines

Inventors

• Knittel Stéphane
• Fribourg Guillaume

Classifications

• B22F10/64

  by thermal means (control of energy beam parameters for post heating B22F10/364) · CPC title

• B22F10/32

  of the atmosphere, e.g. composition or pressure in a building chamber · CPC title

• B22F10/34

  of powder characteristics, e.g. density, oxidation or flowability · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• C22C14/00 Primary

  Alloys based on titanium · CPC title