| 摘要 |
PROBLEM TO BE SOLVED: To provide a copper alloy sheet excellent in conductivity, flexure processability and stress relaxation resistance and composed of a Cu-Zr-based alloy excellent in heat resistance and a manufacturing method of the copper alloy sheet.SOLUTION: A copper alloy sheet comprises a copper alloy that has a composition containing Zr in a range of 0.01 mass% to 0.11 mass% inclusive and the balance Cu with inevitable impurities, where a circle equivalent diameter of deposition particles dispersed and deposited in the copper alloy is less than 1.0 μm, a number density of the deposition particles with a circle equivalent diameter of 0.5 μm or more and less than 1.0 μm is 10/mmor less, a number density of the deposition particles with a circle equivalent diameter of 0.1 μm or more and less than 0.5 μm is 100/mmor less, the conductivity is 85%IACS or more, the Vickers hardness at room temperature is 140 or more, the flexure processability R/t where R is a radius of W flexure tool and t is a thickness of the copper alloy sheet is less than 0.6, and the heat resistant temperature defined in Japan Copper and Brass Association standard JCBA T325:2013 is 500°C or more.SELECTED DRAWING: None |
