Hybrid article, method for forming hybrid article and method for welding

Patent metadata

Field	Value
Publication number	US-2018281124-A1
Application number	US-201715472693-A
Country	US
Kind code	A1
Filing date	Mar 29, 2017
Priority date	Mar 29, 2017
Publication date	Oct 4, 2018
Grant date	—

Abstract

A hybrid article is disclosed including a sintered coating disposed on and circumscribing the lateral surface of a core having a core material and a greater density than the sintered coating. The sintered coating includes more than about 95% up to about 99.5% of a first metallic particulate material including a first melting point, and from about 0.5% up to about 5% of a second metallic particulate material having a second melting point lower than the first melting point. A method for forming the hybrid article is disclosed including disposing the core in a die, introducing a slurry having the metallic particulate materials into a gap between the lateral surface and the die, and sintering the slurry. A method for welding a workpiece is disclosed including the hybrid article serving as a weld filler.

First claim

What is claimed is:

1 . A hybrid article, comprising:
a core including a lateral surface and a core material, and a sintered coating disposed on and circumscribing the lateral surface, the sintered coating including:
a first metallic particulate material including a first melting point and constituting, by weight, more than about 95% up to about 99.5% of the sintered coating; and
a second metallic particulate material including a second melting point and constituting, by weight, from about 0.5% up to about 5% of the sintered coating,
wherein the second melting point is lower than the first melting point and the sintered coating includes a coating density less than the core.

2 . The hybrid article of claim 1 , wherein the hybrid article is a weld filler for a fusion welding process.

3 . The hybrid article of claim 1 , wherein the sintered coating includes a melting point depressant, and the melting point depressant constitutes, by weight, between about 0.5% to about 5% of the hybrid article.

4 . The hybrid article of claim 1 , further including carbon, wherein the carbon constitutes, by weight, between about 0.01% to about 0.08% of the hybrid article.

5 . The hybrid article of claim 1 , wherein the first metallic particulate material constitutes, by weight, from 96% up to about 99.5% of the sintered coating and the second metallic particulate material constitutes, by weight, from about 0.5% up to 4% of the sintered coating.

6 . The hybrid article of claim 1 , wherein the core material and the first metallic particulate material are independently selected from the group consisting of steel alloys, stainless steel alloys, superalloys, nickel-based superalloys, cobalt-based superalloys, iron-based superalloys, hard-to-weld (HTW) alloys, refractory alloys, GTD 111, GTD 222, GTD 262, HASTELLOY W, HAYNES 188, HANES 230, HANES 282, INCONEL 617, INCONEL 625, INCONEL 718, INCONEL 738, MAR-M-247, NIMONIC 263, René 41, René 80, René 108, René 142, René 195, 316SS, and combinations thereof.

7 . The hybrid article of claim 1 , wherein the second metallic particulate material is selected from the group consisting of braze alloys BCo-1, DF-4B, BNi-2, BNi-5, BNi-9, MAR-M-509B, and combinations thereof.

8 . The hybrid article of claim 1 , wherein the sintered coating further includes an average coating thickness of from about 0.5 mm to about 5 mm.

9 . The hybrid article of claim 1 , wherein the core further includes an average diameter of from about 0.7 mm to about 3.2 mm.

10 . A method for forming a hybrid article, comprising:
disposing a core in a die, the core including a lateral surface; forming a gap between the lateral surface and the die, the gap circumscribing the lateral surface; introducing a slurry into the gap, the slurry including a metallic powder and a binder gel, the metallic powder including:
a first metallic particulate material including a first melting point and constituting, by weight, more than about 95% up to about 99.5% of the metallic powder; and
a second metallic particulate material including a second melting point and constituting, by weight, from about 0.5% up to about 5% of the metallic powder,
wherein the second melting point is lower than the first melting point;
coating the lateral surface with the slurry; and sintering the slurry to form a sintered coating circumscribing the lateral surface, forming the hybrid article, the sintered coating including a coating density less than the core.

11 . The method of claim 10 , wherein disposing the core in the die and introducing the slurry include the core material and the first metallic particulate material being independently selected from the group consisting of steel alloys, stainless steel alloys, superalloys, nickel-based superalloys, cobalt-based superalloys, iron-based superalloys, hard-to-weld (HTW) alloys, refractory alloys, GTD 111, GTD 222, GTD 262, HASTELLOY W, HAYNES 188, HANES 230, HANES 282, INCONEL 617, INCONEL 625, INCONEL 718, INCONEL 738, MAR-M-247, NIMONIC 263, René 41, René 80, René 108, Rene 142, René 195, 316SS, and combinations thereof, and the second metallic particulate material being selected from the group consisting of braze alloys BCo-1, DF-4B, BNi-2, BNi-5, BNi-9, MAR-M-509B, and combinations thereof.

12 . The method of claim 10 , wherein sintering the slurry includes a sintering temperature between about 1,100° C. to about 1,250° C.

13 . The method of claim 10 , wherein sintering the slurry includes a sintering duration between about 10 minutes to about 40 minutes.

14 . The method of claim 10 , wherein disposing the core in the die includes passing the core through the die.

15 . The method of claim 10 , wherein introducing the slurry into the gap includes introducing the slurry under elevated pressure.

16 . A method for welding a workpiece, comprising welding the workpiece with a hybrid article serving as a weld filler, the hybrid article including:
a core including a lateral surface and a core material, and a sintered coating disposed on and circumscribing the lateral surface, the sintered coating including:
a first metallic particulate material including a first melting point and constituting, by weight, more than about 95% up to about 99.5% of the sintered coating; and
a second metallic particulate material including a second melting point and constituting, by weight, from about 0.5% up to about 5% of the sintered coating,
wherein:
the second melting point is lower than the first melting point; and
the sintered coating includes a coating density less than the core.

17 . The method of claim 16 , wherein welding the workpiece includes inserting the hybrid article into an aperture of the workpiece and closing the aperture.

18 . The method of claim 16 , wherein welding the workpiece includes cosmetic buildup repair.

19 . The method of claim 16 , wherein the workpiece includes a hard-to-weld (HTW) alloy.

20 . The method of claim 16 , wherein welding the workpiece with the hybrid article serving as the weld filler includes employing a welding technique selected from the group consisting of at least one of fusion welding, gas tungsten arc welding, plasma arc welding, laser beam welding, and electron beam welding.

Assignees

• Gen Electric

Inventors

• Cui Yan
• Kottilingam Srikanth Chandrudu
• Laylock Matthew J
• Tollison Brian Lee

Classifications

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B23P6/007 Primary

  using only additive methods, e.g. build-up welding · CPC title

• B23K26/342

  Build-up welding · CPC title

• B22F3/10

  Sintering only · CPC title

• B23K10/027

  Welding for purposes other than joining, e.g. build-up welding · CPC title