Patent ID: 9210805
Filing Date: 2015-12-08
Classification: C22C,C22F,H01B,H05K

Abstract:
1. A copper alloy foil comprising: copper matrix phases; and composite phases comprising copper-zirconium compound phases and copper phases; wherein the zirconium content of the alloy composition is 3.0 to 7.0 atomic percent; wherein the copper matrix phases and the composite phases form a matrix phase-composite phase layered structure and are arranged alternately parallel to a rolling direction throughout the entire foil as viewed in a cross-section perpendicular to a width direction; wherein the copper-zirconium compound phases and the copper phases in the composite phases form a composite phase inner layered structure, and the copper matrix phases and the composite phases arranged parallel to the rolling direction are laminated alternately in the thickness direction and the copper-zirconium compound phases and the copper phases are laminated alternately in the thickness direction at a phase thickness of 50 nm or less as viewed in the cross-section; wherein the composite phases contain 5% to 25% of amorphous phases in terms of area fraction as viewed in the cross-section; and wherein the copper alloy foil contains oxygen in an amount of 700 to 2,000 ppm by mass.