Elongated, ultra high conductivity electrical conductors for electronic components and vehicles, and methods for producing the same

• US 9,872,384 B2
• Filed: 05/18/2016
• Issued: 01/16/2018
• Est. Priority Date: 05/18/2016
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Braley, Daniel Joseph, Belk, John Huntley, Hasan, Zeaid F., Tanielian, Minas H.
• Primary Examiner(s): Mayo, III, William H
• Application Number:
  US15/158,274
• Publication Number:
  US 20170339787A1
• Time in Patent Office: 608 Days
• Field of Search: 174 74 R, 174 78, 174 84 R, 174 84 C, 174110 R, 174117 R, 174117 F, 174117 FF
• CPC Class Codes: B22F 3/20 by extruding
• CPC Class Codes: C22C 2026/002 Carbon nanotubes
• CPC Class Codes: C22C 26/00 Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
• CPC Class Codes: C22C 30/02 containing copper
• CPC Class Codes: C22C 32/0084 carbon or graphite as the main non-metallic constituent
• CPC Class Codes: C22C 49/14 characterised by the fibres or filaments
• CPC Class Codes: C22C 9/00 Alloys based on copper
• CPC Class Codes: H01B 1/026 Alloys based on copper
• CPC Class Codes: H01B 13/0036 Details
• CPC Class Codes: H01B 13/14 by extrusion extrusion in general B29C48/00
• CPC Class Codes: H05K 1/09 Use of materials for the conductive, e.g. metallic pattern

Abstract

Elongated, ultra-high conductivity electrical conductors for use in advanced electronic components and vehicles, and methods for producing the same, are disclosed herein. The elongated electrical conductors include a conductor body that defines a longitudinal axis. The conductor body includes an isotropically conductive matrix material and a plurality of anisotropically conductive particles interspersed within the isotropically conductive matrix material. Each anisotropically conductive particle defines a respective axis of enhanced electrical conductivity that is aligned with the longitudinal axis of the conductor body. The methods include providing a bulk matrix-particle composite that includes the isotropically conductive matrix material and the plurality of anisotropically conductive particles. The methods further include forming the bulk matrix-particle composite into an elongated electrical conductor and aligning the plurality of anisotropically conductive particles such that the respective axis of enhanced electrical conductivity thereof is at least substantially aligned with the longitudinal axis of the elongated electrical conductor.

Claims

1. An elongated electrical conductor, comprising:

a conductor body defining a longitudinal axis, wherein the conductor body includes;

(i) an isotropically conductive matrix material; and

(ii) a plurality of anisotropically conductive particles interspersed within the isotropically conductive matrix material, wherein each anisotropically conductive particle in the plurality of anisotropically conductive particles defines a respective axis of enhanced electrical conductivity, and further wherein the respective axis of enhanced electrical conductivity of each of the plurality of anisotropically conductive particles is at least substantially aligned with the longitudinal axis of the conductor body.

2. A method of defining the elongated electrical conductor of claim 1, the method comprising:

providing a bulk matrix-particle composite including;

(i) the isotropically conductive matrix material; and

(ii) the plurality of anisotropically conductive particles, wherein an electrical conductivity of each anisotropically conductive particle is greater along the respective axis of enhanced electrical conductivity than the electrical conductivity of the anisotropically conductive particle in at least one other direction that is different from the respective axis of enhanced electrical conductivity;

forming the bulk matrix-particle composite into the elongated electrical conductor; and

aligning the plurality of anisotropically conductive particles such that the respective axis of enhanced electrical conductivity of each of the plurality of anisotropically conductive particles is at least substantially aligned with the longitudinal axis of the elongated electrical conductor.

3. The method of claim 2, wherein the method further includes selecting a weight percentage of the isotropically conductive matrix material within the bulk matrix-particle composite based, at least in part, on at least one of a desired electrical conductivity of the elongated electrical conductor, a desired density of the elongated electrical conductor, and one or more desired mechanical properties of the elongated electrical conductor.

4. The method of claim 2, wherein the forming includes lengthening the bulk matrix-particle composite, along the longitudinal axis, to define the elongated electrical conductor.

5. The method of claim 2, wherein the forming includes at least one of:

(i) extruding the bulk matrix-particle composite through an extrusion die;

(ii) drawing the bulk matrix-particle composite through a drawing die; and

(iii) pultruding the bulk matrix-particle composite through a pultrusion die.

6. The method of claim 2, wherein the aligning is at least substantially concurrent with the forming.

7. The method of claim 2, wherein the aligning is responsive to the forming.

8. The method of claim 2, wherein the aligning includes aligning such that the respective axis of enhanced electrical conductivity of each of the plurality of anisotropically conductive particles is at least substantially parallel to the longitudinal axis of the elongated electrical conductor.

9. The method of claim 2, wherein the aligning includes aligning such that an average value of an angle of intersection between the respective axis of enhanced electrical conductivity of each of the plurality of anisotropically conductive particles and a corresponding line that is parallel to the longitudinal axis of the elongated electrical conductor is less than 30 degrees.

10. The method of claim 2, wherein the aligning includes aligning such that an electrical conductivity of the elongated electrical conductor, as measured along the longitudinal axis thereof, is greater than an electrical conductivity of the bulk matrix-particle composite.

11. The method of claim 2, wherein the method further includes at least one of:

(i) applying a dielectric coating to an external surface of the elongated electrical conductor; and

(ii) inserting the elongate electrical conductor into a length of dielectric tubing.

12. An electronic component, comprising:

a dielectric support; and

a plurality of electrically conductive traces extending within the dielectric support, wherein at least a subset of the plurality of electrically conductive traces includes the elongated electrical conductor of claim 1.

13. A vehicle including the elongated electrical conductor of claim 1.

14. The elongated electrical conductor of claim 1, wherein the isotropically conductive matrix material consists essentially of copper.

15. The elongate electrical conductor of claim 1, wherein the plurality of anisotropically conductive particles consists essentially of a plurality of intercalated graphite domains.

16. The elongate electrical conductor of claim 15, wherein each of the plurality of intercalated graphite domains includes an intercalated dopant selected to enhance the electrical conductivity of the intercalated graphite domains along the axis of enhanced electrical conductivity.

17. The elongate electrical conductor of claim 15, wherein each of the plurality of intercalated graphite domains includes a plurality of graphene layers, wherein each of the plurality of graphene layers defines a respective surface plane, wherein the respective surface plane of each of the plurality of graphene layers in a given intercalated graphite domain of the plurality of intercalated graphite domains is parallel, or at least substantially parallel, to the respective surface plane of each other graphene layer in the given intercalated graphite domain, and further wherein the axis of enhanced electrical conductivity of the given intercalated graphite domain is at least substantially parallel to the respective surface plane of each of the plurality of graphene layers.

18. The elongate electrical conductor of claim 1, wherein the plurality of anisotropically conductive particles consists essentially of a plurality of carbon nanotubes.

19. The elongate electrical conductor of claim 18, wherein each of the plurality of carbon nanotubes includes an intercalated dopant selected to enhance an electrical conductivity of the plurality of carbon nanotubes.

20. The elongate electrical conductor of claim 1, wherein a weight percentage of the isotropically conductive matrix material within the bulk matrix-particle composite is at least 40 weight percent and at most 95 weight percent.

21. An electrically conductive wire, comprising:

a conductor body defining a longitudinal axis, wherein the conductor body includes;

(i) an isotropically conductive matrix material, wherein the isotropically conductive matrix material consists essentially of copper; and

(ii) a plurality of anisotropically conductive particles interspersed within the isotropically conductive matrix material, wherein the plurality of anisotropically conductive particles consists essentially of a plurality of intercalated graphite domains that includes an intercalated bromine dopant, wherein each anisotropically conductive particle in the plurality of anisotropically conductive particles defines a respective axis of enhanced electrical conductivity, and further wherein the respective axis of enhanced electrical conductivity of each of the plurality of anisotropically conductive particles is at least substantially aligned with the longitudinal axis of the conductor body; and

a dielectric coating that covers an external surface of the conductor body.