# US 10,478,896 B2 · Porous copper body, porous copper composite part, method for manufacturing porous copper body, and method for manufacturing porous copper composite part

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- Number: US 10,478,896 B2
- Document ID: US10478896B2
- Status: Granted
- Kind: B2
- Application number: 15/579,668
- Filed: 2016-05-23
- Published: 2018-06-14
- Granted: 2019-11-19
- Earliest claimed: 2015-06-12
- Assignees: Mitsubishi Materials Corporation
- Applicants: Mitsubishi Materials Corporation
- Inventors: Koichi Kita; Jun Kato; Toshihiko Saiwai
- Web page: https://patentgrep.com/patent/US10478896B2

## CPC

- B22F 3/1143: {involving an oxidation, reduction or reaction step}
- B22F 1/00: Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F 1/062: Fibrous particles
- B22F 3/11: Making porous workpieces or articles
- B22F 3/1103: {with particular physical characteristics}
- B22F 7/002: {of porous nature}
- B22F 7/004: {comprising at least one non-porous part}
- B22F 7/04: with one or more layers not made from powder, e.g. made from solid metal
- B22F 7/062: {involving the connection or repairing of preformed parts}
- C22C 9/00: Alloys based on copper
- C22C 47/20: by subjecting to pressure and heat an assembly comprising at least one metal layer or sheet and one layer of fibres or filaments
- C22F 1/08: of copper or alloys based thereon
- B32B 15/01: all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)}
- C22F 1/00: Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working (apparatus for mechanical working of metal B21, B23, B24)
- F28F 1/10: Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses (crimped or corrugated elements F28F1/06, F28F1/08)
- Y10T 428/12153: Interconnected void structure [e.g., permeable, etc.]
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A porous copper body including a skeleton having a three-dimensional network structure is provided. An oxidation-reduction layer formed by an oxidation-reduction treatment is provided on a surface of the skeleton, and the average crystal grain size of an entirety including the skeleton and the oxidation-reduction layer is 5% or more of the diameter of the skeleton.

## Claims

### Claim 1

A porous copper body, comprising:
a skeleton having a three-dimensional network structure,
wherein an oxidation-reduction layer formed by an oxidation-reduction treatment is provided on a surface of the skeleton,
the skeleton is constituted by a sintered body made of a plurality of copper fibers,
in each of the copper fibers, a diameter R is set to be in a range of 0.05 mm to 1.0 mm, and a ratio L/R of a length L to the diameter R is set to be in a range of 4 to 2500, and
an average crystal grain size of an entirety including the skeleton and the oxidation-reduction layer is in a range of 5% to 300% of a diameter of the copper fibers in the skeleton.

### Claim 2 (depends on 1)

A porous copper composite part, comprising:
a main body of the composite part; and
the porous copper body according to claim 1 bonded to the main body of the composite part.

### Claim 3 (depends on 2)

The porous copper composite part according to claim 2,
wherein a bonding surface of the main body of the composite part, to which the porous copper body is bonded, is made of copper or a copper alloy, and the porous copper body and the main body of the composite part are bonded to each other through sintering.

### Claim 4 (depends on 1)

A method for manufacturing the porous copper body according to claim 1, comprising:
an oxidation-reduction treatment step of subjecting the skeleton to the oxidation-reduction treatment to form the oxidation-reduction layer; and
a recrystallization step of recrystallizing the skeleton and the oxidation-reduction layer.

### Claim 5 (depends on 4)

The method for manufacturing the porous copper body according to claim 4,
wherein the skeleton is formed by sintering a copper raw material.

### Claim 6 (depends on 4)

The method for manufacturing the porous copper body according to claim 4,
wherein prior to the oxidation-reduction treatment, the skeleton is subjected to a homogenization treatment.

### Claim 7 (depends on 4)

A method for manufacturing a porous copper composite part which comprises: a main body of the composite part; and a porous copper body bonded to the main body of the composite part, comprising:
a bonding step of bonding the porous copper body manufactured by the method for manufacturing the porous copper body according to claim 4, and the main body of the composite part to each other.

### Claim 8 (depends on 7)

The method for manufacturing a porous copper composite part according to claim 7,
wherein a bonding surface of the main body of the composite part, to which the porous copper body is bonded, is made of copper or a copper alloy, and the porous copper body and the main body of the composite part are bonded to each other through sintering.

### Claim 9 (depends on 5)

The method for manufacturing the porous copper body according to claim 5,
wherein prior to the oxidation-reduction treatment, the skeleton is subjected to a homogenization treatment.

### Claim 10 (depends on 5)

A method for manufacturing a porous copper composite part which comprises: a main body of the composite part; and a porous copper body bonded to the main body of the composite part, comprising:
a bonding step of bonding the porous copper body manufactured by the method for manufacturing the porous copper body according to claim 5, and the main body of the composite part to each other.

### Claim 11 (depends on 6)

A method for manufacturing a porous copper composite part which comprises: a main body of the composite part; and a porous copper body bonded to the main body of the composite part, comprising:
a bonding step of bonding the porous copper body manufactured by the method for manufacturing the porous copper body according to claim 6, and the main body of the composite part to each other.

### Claim 12 (depends on 10)

The method for manufacturing a porous copper composite part according to claim 10,
wherein a bonding surface of the main body of the composite part, to which the porous copper body is bonded, is made of copper or a copper alloy, and the porous copper body and the main body of the composite part are bonded to each other through sintering.