Rolled copper foil
View Patent ↗A rolled copper foil consisted of at least either of silicon (Si) and iron (Fe), boron (B), silver (Ag), oxygen (O) of 0.002 mass % or less, and a balance consisted of copper (Cu) and inevitable impurities.
1. A rolled copper foil consisting of boron, silver, at least either of silicon and iron, and a balance consisting of copper and inevitable impurities, wherein a total amount of at least one of silicon and iron is 0.001 to 0.0045 mass %, an amount of the boron is 0.003 to 0.04 mass %, and an amount of the silver is 0.002 to 0.025 mass %.
2. The rolled copper foil according to claim 1 , wherein the rolled copper foil has a thickness of 20 μm or less.
3. The rolled copper foil according to claim 1 , wherein the amount of the silver is 0.0025 to 0.0225 mass %.
4. The rolled copper foil according to claim 1 , wherein the amount of the silver is 0.003 to 0.02 mass %.
5. The rolled copper foil according to claim 1 , wherein the amount of the silver is 0.0085 mass %.
6. The rolled copper foil according to claim 1 , wherein the amount of the boron is 0.003 to 0.035 mass %.
7. The rolled copper foil according to claim 1 , wherein the amount of the boron is 0.003 to 0.03 mass %.
8. The rolled copper foil according to claim 1 , wherein the amount of the boron is 0.0145 mass %.
9. The rolled copper foil according to claim 1 , wherein the rolled copper foil has been heat treated at 160° C. for 120 minutes.
10. The rolled copper foil according to claim 1 , wherein the rolled copper foil has been formed by:
hot rolling an ingot from which the copper foil is to be made to form a hot rolled sheet;
repeatedly cold rolling and intermediate annealing the hot rolled sheet for a predetermined number of times so as to form a processed sheet;
subsequently annealing the processed sheet so as to form an annealed sheet; and
cold rolling the annealed sheet so as to form a cold rolled sheet.
11. The rolled copper foil according to claim 10 , wherein the cold rolled sheet has been heat treated at 160° C. for 120 minutes after the cold rolling.
12. A rolled copper foil consisting of boron, silver, oxygen of 0.002 mass % or less, at least either of silicon and iron, and a balance consisted of copper and inevitable impurities, wherein a total amount of at least one of silicon and iron is 0.001 to 0.0045 mass %, an amount of the boron is 0.003 to 0.04 mass %, and an amount of the silver is 0.002 to 0.025 mass %.
13. The rolled copper foil according to claim 12 , wherein the amount of the silver is 0.0025 to 0.0225 mass %.
14. The rolled copper foil according to claim 12 , wherein the amount of the silver is 0.003 to 0.02 mass %.
15. The rolled copper foil according to claim 12 , wherein the amount of the silver is 0.0085 mass %.
16. The rolled copper foil according to claim 12 , wherein the amount of the boron is 0.003 to 0.035 mass %.
17. The rolled copper foil according to claim 12 , wherein the amount of the boron is 0.003 to 0.03 mass %.
18. The rolled copper foil according to claim 12 , wherein the amount of the boron is 0.0145 mass %.
19. The rolled copper foil according to claim 12 , wherein the rolled copper foil has a thickness of 20 μm or less.
20. The rolled copper foil according to claim 12 , wherein the rolled copper foil has been formed by:
hot rolling an ingot from which the copper foil is to be made to form a hot rolled sheet;
repeatedly cold rolling and intermediate annealing the hot rolled sheet for a predetermined number of times so as to form a processed sheet;
subsequently annealing the processed sheet so as to form an annealed sheet; and
cold rolling the annealed sheet so as to form a cold rolled sheet.
21. The rolled copper foil according to claim 20 , wherein the cold rolled sheet has been heat treated at 160° C. for 120 minutes after the cold rolling.