Method of manufacturing aluminum-based clad heat sink, and aluminum-based clad heat sink manufactured thereby

Patent metadata

Field	Value
Publication number	US-2020331066-A1
Application number	US-201916427622-A
Country	US
Kind code	A1
Filing date	May 31, 2019
Priority date	Apr 16, 2019
Publication date	Oct 22, 2020
Grant date	—

Abstract

Disclosed are a method of manufacturing an aluminum-based clad heat sink, and an aluminum-based clad heat sink manufactured by the method. The method includes ball-milling (i) aluminum or aluminum alloy powder and (ii) carbon nanotubes (CNT) to prepare a composite powder, preparing a multi-layered billet using the composite billet, and directly extruding the multi-layered billet using an extrusion die to produce a heat sink. The method has an advantage of producing a light high-strength high-conductivity aluminum-based clad heat sink having an competitive advantage in terms of price by using direct extrusion that is suitable for mass production due to its simplicity in process procedure and equipment required.

First claim

What is claimed is:

1 . A method of manufacturing an aluminum-based clad heat sink, the method comprising:
(A) preparing a composite powder by ball-milling (i) aluminum or aluminum alloy powder and (ii) carbon nanotubes (CNT); (B) preparing a multi-layered billet using the composite powder; and (C) directly extruding the multi-layered billet using an extrusion die, wherein the multi-layered billet comprises a core layer and at least two shell layers surrounding the core layer, the shell layers except for the outermost shell layer are made of the composite powder and the outermost shell layer is made of (i) the aluminum or aluminum alloy powder or (ii) the composite powder, and each of the composite powders in the core layer and each of the shell layer comprises a different volume part of the carbon nanotubes with respect to a predetermined volume part of the aluminum or aluminum alloy powder.

2 . The method according to claim 1 , wherein the composite powder comprises 100 parts by volume of the aluminum or aluminum alloy powder and 0.01 to 10 parts by volume of the carbon nanotubes.

3 . The method according to claim 1 , wherein the ball-milling in the step (A) is performed at a low speed ranging from 150 to 300 rpm or a high speed of 300 or more rpm, for a duration of 12 to 48 hours, with 100 to 1500 parts by volume of milling balls and 10 to 50 parts by volume of an organic solvent with respect to 100 parts by volume of the composite powder, in a horizontal or planetary ball mill.

4 . The method according to claim 3 , wherein the organic solvent is heptane.

5 . The method according to claim 1 , wherein the multi-layered billet comprises a core layer, a first shell layer surrounding the core layer, and a second shell layer surrounding the first shell layer.

6 . The method according to claim 5 , wherein the multi-layered billet comprises: a first billet having a can shape and serving as the second shell layer; a second billet disposed inside the first billet as the first shell layer; and a third billet disposed inside the second billet as the core layer.

7 . The method according to claim 6 , wherein the second billet comprises 0.09 to 10 parts by volume of the carbon nanotubes with respect to 100 parts by volume of the aluminum or aluminum alloy powder, and
the third billet comprises 0 to 0.08 part by volume the carbon nanotubes with respect to 100 parts by volume of the aluminum or aluminum alloy powder.

8 . The method according to claim 1 , wherein in the step (B), the preparing of the multi-layered billet comprises compressing the composite powder at a high pressure of 10 to 100 MPa.

9 . The method according to claim 1 , wherein in the step (B), the preparing of the billet comprises subjecting the composite powder to spark plasma sintering performed at a pressure of 30 to 100 MPa and a temperature of 280° C. to 600° C. for a duration of 1 second to 30 minutes.

10 . An aluminum-based clad heat sink produced by the method of claim 1 .

11 . The heat sink according to claim 10 , wherein the heat sink is a fin-type heat sink or a bar-type heat sink.

12 . The heat sink according to claim 11 , wherein the heat sink is a straight fin-type heat sink or a pin fin-type heat sink.

Assignees

• Nat Univ Pukyong Ind Univ Coop Found

Inventors

• Kwon Hansang

Classifications

• H10W40/257

  having a heterogeneous or anisotropic structure, e.g. powder or fibres in a matrix, wire mesh or porous structures (H10W40/254, H10W40/251 take precedence) · CPC title

• H10W70/02

  of conductive package substrates serving as an interconnection, e.g. of metal plates (manufacture or treatment of leadframes H10W70/04) · CPC title

• C22C21/00

  Alloys based on aluminium · CPC title

• B32B15/016

  all layers being formed of aluminium or aluminium alloys · CPC title

• B22F7/02

  of composite layers {(B22F7/002 takes precedence)} · CPC title