CLAD MATERIAL

• US 20130209874A1
• Filed: 06/02/2011
• Published: 08/15/2013
• Est. Priority Date: 06/02/2010
• Status: Active Grant

• Current Assignee: Nippon Steel Corporation
• Original Assignee: Nippon Steel & Sumitomo Metal Corporation (Nippon Steel Corporation)
• Inventors: Yoshida, Kentarou, Kita, Hayato, Kaminaka, Hideya, Arizono, Daisaku, Yoshida, Syuji, Takeuchi, Kouichi, Shibuya, Masayuki
• Granted Patent: US 9,979,004 B2
• Time in Patent Office: Days
• US Class Current: 429/211
• CPC Class Codes: B23K 11/002 specially adapted for particular articles or work
• CPC Class Codes: B23K 11/115 by means of two electrodes placed opposite one another on both sides of the welded parts
• CPC Class Codes: B23K 20/04 by means of a rolling mill
• CPC Class Codes: B23K 20/233 without ferrous layer
• CPC Class Codes: B23K 2101/28 Beams
• CPC Class Codes: B23K 2101/38 Conductors
• CPC Class Codes: B23K 2103/12 Copper or alloys thereof
• CPC Class Codes: B23K 2103/18 Dissimilar materials
• CPC Class Codes: B23K 2103/26 Alloys of Nickel and Cobalt and Chromium
• CPC Class Codes: 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
• CPC Class Codes: C22F 1/08 of copper or alloys based thereon
• CPC Class Codes: H01M 50/534 characterised by the material of the leads or tabs
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The clad material comprises outer layers each consisting of Ni or Ni alloy and a base layer consisting of Cu or Cu alloy, and is characterized in that peeling-off at a clad boundary is not recognized in cross section observation made after the clad material has been subjected to a 90° reverse bend test ten times, and the number of reverse bend cycles before rupture is 17 cycles or more. The clad material has with both of excellent corrosion resistance against electrolytic solution and high electric conductivity.

Claims

1. A clad material which comprises outer layers each consisting of Ni or Ni alloy and a base layer consisting of Cu or Cu alloy, wherein the clad material having a total thickness of 0.2 mm or smaller, and wherein peeling-off at a clad boundary is not recognized in cross section observation made after the clad material has been subjected to a 90°

reverse bend test ten times, and the number of reverse bend cycles before rupture is 17 cycles or more.

4. The clad material according to claim 1, wherein a porosity of the clad material is 20% or less.

5. The clad material according to claim 1, wherein a coefficient of variation in outer layer thickness is 5 or less.

6. The clad material according to claim 1, wherein a Ni layer having a thickness of 10 μ

m or smaller is formed in a cut cross section of the clad material.

7. The clad material according to claim 1, wherein the clad material is produced by lapping the outer layers each consisting of Ni or Ni alloy on the base layer consisting of Cu or Cu alloy, by performing joint rolling under conditions satisfying a relationship expressed by Formula (1), by holding the rolled material at a temperature not lower than 650°

C. and not higher than 975°

C. for a time period not shorter than 10 minutes and not longer than 8 hours, by performing heat treatment for diffusing and eliminating oxides that are present at a boundary, and then performing hot working at least one time;

T≧

−

10·

R+300 

 

(1)

where T is rolling temperature (°

C.) and R is draft (%).

8. The clad material according to claim 7, wherein the joint rolling is performed under conditions satisfying a relationship expressed by Formula (2):

T≧

−

17.8·

R+1084 

 

(2)

where T is rolling temperature (°

C.) and R is draft (%).

2. A clad material which comprises outer layers each consisting of Ni or Ni alloy and a base layer consisting of Cu or Cu alloy, wherein the clad material having a total thickness of more than 0.2 mm, and wherein peeling-off at a clad boundary is not recognized in visual cross section observation made after the clad material has been subjected to a 90°

bend test with a bend radius being two times the clad material thickness.

9. The clad material according to claim 2, wherein a porosity of the clad material is 20% or less.

11. The clad material according to claim 2, wherein a coefficient of variation in outer layer thickness is 5 or less.

13. The clad material according to claim 2, wherein a Ni layer having a thickness of 10 μ

m or smaller is formed in a cut cross section of the clad material.

15. The clad material according to claim 2, wherein the clad material is produced by lapping the outer layers each consisting of Ni or Ni alloy on the base layer consisting of Cu or Cu alloy, by performing joint rolling under conditions satisfying a relationship expressed by Formula (1), by holding the rolled material at a temperature not lower than 650°

C. and not higher than 975°

C. for a time period not shorter than 10 minutes and not longer than 8 hours, by performing heat treatment for diffusing and eliminating oxides that are present at a boundary, and then performing hot working at least one time;

T≧

−

10·

R+300 

 

(1)

where T is rolling temperature (°

C.) and R is draft (%).

17. The clad material according to claim 15, wherein the joint rolling is performed under conditions satisfying a relationship expressed by Formula (2):

T≧

−

17.8·

R+1084 

 

(2)

where T is rolling temperature (°

C.) and R is draft (%).

3. A clad material comprising outer layers each consisting of Ni or Ni alloy and a base layer consisting of Cu or Cu alloy, wherein a peel strength of Ni—

Cu is 4 N/mm or higher.

10. The clad material according to claim 3, wherein a porosity of the clad material is 20% or less.

12. The clad material according to claim 3, wherein a coefficient of variation in outer layer thickness is 5 or less.

14. The clad material according to claim 3, wherein a Ni layer having a thickness of 10 μ

m or smaller is formed in a cut cross section of the clad material.

16. The clad material according to claim 3, wherein the clad material is produced by lapping the outer layers each consisting of Ni or Ni alloy on the base layer consisting of Cu or Cu alloy, by performing joint rolling under conditions satisfying a relationship expressed by Formula (1), by holding the rolled material at a temperature not lower than 650°

C. and not higher than 975°

C. for a time period not shorter than 10 minutes and not longer than 8 hours, by performing heat treatment for diffusing and eliminating oxides that are present at a boundary, and then performing hot working at least one time;

T≧

−

10·

R+300 

 

(1)

where T is rolling temperature (°

C.) and R is draft (%).

18. The clad material according to claim 16, wherein the joint rolling is performed under conditions satisfying a relationship expressed by Formula (2):

T≧

−

17.8·

R+1084 

 

(2)

where T is rolling temperature (°

C.) and R is draft (%).