Copper alloy
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United States of America Patent
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Mar 22, 2011
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N/A
app pub date -
Aug 10, 2005
filing date -
Aug 10, 2004
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Abstract
A copper alloy consists essentially of Cu: 69 to 88 mass %, Si: 2 to 5 mass %, Zr: 0.0005 to 0.04 mass %, P: 0.01 to 0.25 mass %, and Zn: balance; has relation of, in terms of content of element a, [a] mass %, f0=[Cu]−3.5[Si]−3[P]=61 to 71, f1=[P]/[Zr]=0.7 to 200, f2=[Si]/[Zr]=75 to 5000, and f3=[Si]/[P]=12 to 240; has a metal structure containing α phase and, K phase and/or γ phase, and has relation of, in terms of a content of phase b, [b]%, in an area rate, f4=[α]+[γ]+[K]≧85 and f5=[γ]+[K]+0.3[μ]−[β]=5 to 95; and has an average grain diameter of 200 μm or less in a macrostructure when melted and solidified.
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