A 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-2018112293-A1
Application number	US-201615573043-A
Country	US
Kind code	A1
Filing date	May 11, 2016
Priority date	May 21, 2015
Publication date	Apr 26, 2018
Grant date	—

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

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 addition powder comprising a mixture of a metallic aluminum powder and of a metallic titanium powder wherein the composition includes 0.5% to 5% by weight of addition powder.

2 . A composition according to claim 1 , comprising 0.5% to 2% by weight of addition powder.

3 . A composition according to claim 1 , wherein the Ti/Al atomic ratio of the addition powder lies in the range 0.7 to 1.3.

4 . 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.

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

6 . 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%.

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

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

9 . A method according to claim 8 , 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.

10 . A method according to claim 7 , 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.

11 . A method according to claim 7 , wherein the sintering is performed under an inert atmosphere of argon.

12 . A method according to claim 7 , wherein the part to be fabricated is a part for aviation.

Assignees

• Safran Aircraft Engines

Inventors

• Knittel Stéphane
• Fribourg Guillaume

Classifications

• B22F10/34

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

• B22F10/32

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

• B22F10/64

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

• B22F10/28

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

• B22F3/105

  by using electric current {other than for infrared radiant energy}, laser radiation or plasma (B22F3/11 takes precedence){; by ultrasonic bonding (B22F3/115 takes precedence)} · CPC title