Copper alloy sheet strip with surface coating layer excellent in heat resistance
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United States of America Patent
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Mar 19, 2019
Grant Date -
Mar 2, 2017
app pub date -
Feb 20, 2015
filing date -
Feb 20, 2014
priority date (Note) -
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Abstract
A copper alloy sheet strip with a surface coating layer, including: a copper alloy sheet strip, as a base material, including copper, 1.0 to 4.5% by mass of Ni and/or Co and 0.2 to 1.0% by mass of Si, based on the total amount of the copper alloy sheet strip; and a surface coating layer including a Ni layer, a Cu—Sn alloy layer and a Sn layer formed on a surface of the copper alloy sheet strip in this order. A Cu—Sn alloy layer is partially exposed on an outermost surface of the surface coating layer such that a surface exposed area ratio is from 3 to 75%. A surface roughness of the surface coating layer is 0.15 μm or more in at least one direction, and 3.0 μm or less in all directions.
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