# US 8,771,839 B2 · Composite material

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- Number: US 8,771,839 B2
- Document ID: US8771839B2
- Status: Granted
- Kind: B2
- Application number: 13/742,607
- Filed: 2013-01-16
- Published: 2013-07-25
- Granted: 2014-07-08
- Earliest claimed: 2012-01-23
- Assignees: Hitachi Metals, Ltd.
- Applicants: Hitachi Cable, Ltd.
- Inventors: Kazuma Kuroki; Hiromitsu Kuroda; Tetsuya Tokumitsu
- Web page: https://patentgrep.com/patent/US8771839B2

## CPC

- B32B 15/015: {the said other metal being copper or nickel or an alloy thereof}
- B21B 1/38: for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, {pack rolling}(B21B1/40 takes precedence; folding sheets before, or separating layers after, rolling B21B47/00)
- B32B 15/011: {all layers being formed of iron alloys or steels}
- B32B 15/013: {one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium}
- C22C 9/05: with manganese as the next major constituent
- C22C 18/04: with aluminium as the next major constituent
- C22C 23/00: Alloys based on magnesium
- C22C 38/18: containing chromium
- Y10T 428/12729: Group IIA metal-base component
- Y10T 428/12757: Fe
- Y10T 428/12937: Co- or Ni-base component next to Fe-base component
- Y10T 428/12944: Ni-base component
- Y10T 428/12958: Next to Fe-base component
- Y10T 428/12979: Containing more than 10% nonferrous elements [e.g., high alloy, stainless]
- Y10T 428/2495: Thickness [relative or absolute]
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B21B: ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B21, see B21C; bending by rolling B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B21H; pressure welding by means of a rolling mill B23K20/04)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A composite material includes a clad material including a base material that includes an iron-chromium alloy and vibration-damping layers that are provided on both surfaces of the base material and include a metal to suppress a vibration. A total thickness of the vibration-damping layers provided on the both surfaces of the base material is in a range of not less than 10% and not more than 40% relative to a total thickness of the clad material.

## Claims

### Claim 1

A composite material, comprising:
a clad material comprising a base material consisting essentially of a ferrite-based stainless steel not containing nickel and vibration-damping layers that are provided on both surfaces of the base material and comprise a metal to suppress a vibration,
wherein each of the vibration-damping layers consists essentially of at least one of pure nickel, pure iron, pure magnesium, Al-78Zn, and Mg-0.6Zr,
wherein a total thickness of the vibration-damping layers provided on the both surfaces of the base material is in a range of not less than 10% and not more than 40% relative to a total thickness of the clad material.

### Claim 2 (depends on 1)

The composite material according to claim 1, the clad material has a tensile strength of not less than 400 MPa at 200° C.

### Claim 3 (depends on 1)

The composite material according to claim 1, wherein the clad material has a total thickness of not less than 1 mm and not more than 5 mm.

### Claim 4 (depends on 1)

The composite material according to claim 1, wherein the vibration-damping layers comprise a same material and have substantially a same thickness.

### Claim 5 (depends on 1)

The composite material according to claim 1, wherein the clad material and the vibration-damping layers are bonded at all points between their mutually-contacting surfaces.

### Claim 6

A composite material, comprising:
a clad material comprising a base material that comprises an iron-chromium alloy and vibration-damping layers that are provided on both surfaces of the base material and comprise a metal to suppress a vibration,
wherein a total thickness of the vibration-damping layers provided on the both surfaces of the base material is in a range of not less than 10% and not more than 40% relative to a total thickness of the clad material,
wherein the clad material has a damping coefficient of not less than 4.5% at 200° C.