Graphene doped aluminum composite and method of forming

Patent metadata

Field	Value
Publication number	US-10829677-B2
Application number	US-201815970399-A
Country	US
Kind code	B2
Filing date	May 3, 2018
Priority date	Jun 27, 2017
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

Aspects of the disclosure generally relate to a graphene doped aluminum composite, as well as a method of forming such a composite. Devices for heat dissipation can include such a graphene doped aluminum composite, where the composite can be formed in a process that includes crystallizing aluminum around substantially uniformly dispersed graphene.

First claim

What is claimed is:

1. A method of forming a graphene doped aluminum composite, the method comprising:
homogenously dispersing graphene powder into a carrier liquid to form a first dispersion including homogenously dispersed graphene;
homogenously dispersing aluminum powder into the first dispersion to form a homogeneous dispersion;
evaporating the homogenous dispersion to form a powder mixture; and
heating the powder mixture and cooling to form the graphene doped aluminum composite, wherein the heating the powder mixture further comprises heating the powder mixture to a temperature where aluminum melts while graphene remains in solid form and cooling includes the formation of planar hexagonal graphene ring structures seeding the formation of crystals of aluminum to form the graphene doped aluminum composite.

2. The method of claim 1 wherein either of the homogenously dispersing the graphene powder or the homogenously dispersing the aluminum powder comprises at least one of: stirring continuously, stirring in intervals, or operating an ultrasonic device.

3. The method of claim 1 wherein the evaporating the homogeneous dispersion occurs at 20 degrees Celsius.

4. The method of claim 1 wherein the evaporating the homogeneous dispersion further comprises operating one of a vacuum chamber or an auxiliary heating device to remove liquid from the homogenous dispersion.

5. The method of claim 1 wherein the heating the powder mixture comprises heating the powder mixture to at least 660 degrees Celsius.

6. The method of claim 1 , further comprising preventing oxidation of the powder mixture by utilizing an atmosphere of at least one of argon or nitrogen.

7. The method of claim 1 wherein the graphene doped aluminum composite has an electrical conductivity that is at least 0.7 μS/m and a thermal conductivity that is at least 400 W/m·K.

8. The method of claim 1 wherein the formation of crystals of aluminum includes forming two cubic close-packed crystals of aluminum on each of the graphene ring structures.

9. The method of claim 1 , further comprising at least one of pressing or extruding the graphene doped aluminum composite.

Assignees

• Ge Aviat Systems Ltd

Inventors

• Bland Aaron
• Rainbow Alexander James
• Sidgwick David Hall
• Smith Michael James

Classifications

• C22C1/10

  Alloys containing non-metals (C22C1/05, C22C1/08 take precedence) · CPC title

• C22C1/1026

  starting from a solution or a suspension of (a) compound(s) of at least one of the alloy constituents · CPC title

• F28D7/1615

  the conduits being inside a casing and extending at an angle to the longitudinal axis of the casing; the conduits crossing the conduit for the other heat exchange medium · CPC title

• C01B32/194

  After-treatment · CPC title

• C09K5/14 Primary

  Solid materials, e.g. powdery or granular · CPC title