Systems and methods for fabricating objects including amorphous metal using techniques akin to additive manufacturing

Patent metadata

Field	Value
Publication number	US-9579718-B2
Application number	US-201414163936-A
Country	US
Kind code	B2
Filing date	Jan 24, 2014
Priority date	Jan 24, 2013
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

Systems and methods in accordance with embodiments of the invention fabricate objects including amorphous metals using techniques akin to additive manufacturing. In one embodiment, a method of fabricating an object that includes an amorphous metal includes: applying a first layer of molten metallic alloy to a surface; cooling the first layer of molten metallic alloy such that it solidifies and thereby forms a first layer including amorphous metal; subsequently applying at least one layer of molten metallic alloy onto a layer including amorphous metal; cooling each subsequently applied layer of molten metallic alloy such that it solidifies and thereby forms a layer including amorphous metal prior to the application of any adjacent layer of molten metallic alloy; where the aggregate of the solidified layers including amorphous metal forms a desired shape in the object to be fabricated; and removing at least the first layer including amorphous metal from the surface.

First claim

What claimed is:

1. A method of fabricating a free-standing object comprising an amorphous metal, the method comprising:
applying a first layer of molten metallic alloy to a surface using a thermal spraying technique and a spot size having a diameter of about 1 to 100 mm, wherein the molten metallic alloy comprises one or more of Ti, Zr, and Cu, wherein the surface comprises a removal promoting material, and wherein the thermal spraying technique is selected from the group consisting of: high velocity oxy-fuel spraying, plasma spraying, wire arc spraying, and mixtures thereof;
cooling the first layer of molten metallic alloy such that it solidifies and thereby forms a first cooled and solidified layer comprising the amorphous metal, wherein the amorphous metal comprises one or more of Ti, Zr, and Cu, and wherein the removal promoting material facilitates separation of the amorphous metal from the surface;
applying a second layer of molten metallic alloy onto the first cooled and solidified layer comprising the amorphous metal using the thermal spraying technique and the spot size having a diameter of about 1 to 100 mm;
cooling the second layer of molten metallic alloy such that it solidifies and thereby forms a second cooled and solidified layer comprising the amorphous metal on the first cooled and solidified layer comprising the amorphous metal;
wherein an aggregate of the cooled and solidified layers comprising the amorphous metal forms a desired shape of the free-standing object to be fabricated; and
separating the aggregate of the cooled and solidified layers comprising the amorphous metal from the surface, thereby fabricating the free-standing object comprising the amorphous metal.

2. The method of claim 1 , further comprising applying and cooling one or more additional layers of molten metallic alloy to form one or more additional cooled and solidified layers comprising the amorphous metal that are each formed on a previously formed cooled and solidified layer comprising the amorphous metal.

3. The method of claim 1 , wherein the feedstock for the thermal spraying technique is selected from the group consisting of: wire, powder, a molten pool of the metallic alloy composition being applied, a molten pool of the constituent elements of the metallic alloy composition being applied, and mixtures thereof.

4. The method of claim 1 , wherein the thermal spraying technique utilizes a computer-controlled apparatus.

5. The method of claim 1 , wherein multiple thermal spraying apparatuses are used to apply the layers of molten metallic alloy.

6. The method of claim 1 , wherein at least one of the layers of molten metallic alloy has a composition that has a critical casting thickness of greater than approximately 1 mm.

7. The method of claim 1 , wherein at least one of the layers of molten metallic alloy has a composition that has a critical casting thickness of less than approximately 100 μm.

8. The method of claim 1 , wherein at least one of the layers of molten metallic alloy has a different composition than at least one other of the layers of molten metallic alloy.

9. The method of claim 1 , wherein at least one of the layers of molten metallic alloy has a thickness of between approximately 10 nanometers and approximately 100 micrometers.

10. The method of claim 1 , wherein the amorphous metal comprising one or more of Ti, Zr, and Cu further comprises a composition selected from the group consisting of: a zirconium based composition, a nickel based composition, a cobalt based composition, an iron based composition, a palladium based composition, a platinum based composition, a gold based composition, a copper based composition, a tungsten based composition, a niobium based composition, a hafnium based composition, an aluminum based composition, a composition that includes at least 50% (atomic) of a mixture of Zr—Ti—Be, a composition that includes at least 50% (atomic) of a mixture of Zr—Be, a composition that includes at least 50% (atomic) of a mixture of Cu—Zr, a composition that includes at least 50% (atomic) of a mixture of Cu—Zr—Al, a composition that includes at least 50% (atomic) of a mixture of Fe—Ni, a composition that includes at least 50% (atomic) of a mixture of Ni—P, a composition that includes at least 50% (atomic) of a mixture of Fe—Ni—B, a composition that includes at least 50% (atomic) of a mixture of Fe—P, a composition that includes at least 50% (atomic) of a mixture of Pd—P, a composition that includes at least 50% (atomic) of a mixture of Cu—P, a composition that includes at least 50% (atomic) of a mixture of Al—Y, and a composition that includes at least 50% (atomic) of a mixture of Ni—Nb.

11. The method of claim 1 , wherein the free-standing object comprises 25% amorphous metal by volume.

12. The method of claim 1 , wherein a shear modulus of the free-standing object is at least 5% lower than if the free-standing object were fabricated using a casting technique.

13. The method of claim 1 , wherein a fracture toughness of the free-standing object is at least 10% higher than if the free-standing object were fabricated using a casting technique.

14. The method of claim 1 , wherein the surface is one of: a flat surface, a curved surface, or a surface having a periodic cellular structure.

15. The method of claim 1 , wherein the surface has axial symmetry, and wherein the first layer of molten metallic alloy is applied to the surface while the surface is being rotated about its axis of symmetry.

16. The method of claim 1 , wherein the surface comprises a material selected from the group consisting of: metal, carbide, graphite, ceramic, glass, plastic, and mixtures thereof.

17. The method of claim 1 , wherein the removal promoting material comprises a coating of graphite powder.

18. The method of claim 1 , wherein the aggregate of the cooled and solidified layers comprising the amorphous metal is separated from the surface by mechanically separating the aggregate of the cooled and solidified layers comprising the amorphous metal from the surface.

19. The method of claim 1 , wherein the free-standing object has a thickness of between approximately 0.1 mm and approximately 25 mm.

20. The method of claim 1 , wherein the freestanding object has a thickness that is greater than a critical casting thickness of any composition of the applied layers of molten metallic alloy.

21. The method of claim 1 , wherein the free-standing object is sheet metal.

22. The method of claim 21 , wherein the sheet metal has a thickness of between approximately 0.1 mm and approximately 2 mm.

23. The method of claim 1 , further comprising subjecting the aggregate of the cooled and solidified layers including the amorphous metal to one of: a rolling process, an embossing process, a stamping process, a heating process, a chemical etching process, or mixtures thereof.

24. The method of claim 23 , wherein the aggregate of the cooled and solidified layers including the amorphous metal is subjected to a rolling process that removes undesired imperfections in the aggregate of the solidified layers including the amorphous metal.

25. The method of claim 1 , wherein:
an additional surface is used to define a shape of the free-standing object;
the free-standing object has extrusion symmetry; and
the free-standing object is separated from the additional surface using a pressing technique.

26. A method of fabricating a free-st

Assignees

• California Inst Of Techn

Inventors

• Hofmann Douglas

Classifications

• B22F12/55

  Two or more means for feeding material · CPC title

• B22F12/53

  Nozzles · CPC title

• B22F12/30

  Platforms or substrates · CPC title

• B22F12/20

  Cooling means · CPC title

• B22F10/47

  characterised by structural features · CPC title