Copper alloy

Details Copper alloy Copper alloy

C - Chemistry, Metallurgy

22

C

C22C 9/00 (2006.01) B22D 1/00 (2006.01) B22D 21/00 (2006.01) B22D 27/20 (2006.01)

Patent

CA 2563097

A copper alloy, which has a chemical composition, in mass %, that Cu: 69 to 88 %, Si: 2 to 5 %, Zr: 0.0005 to 0.04 %, P: 0.01 to 0.25 %, and the balance: Zn, wherein with respect to [a] mass % representing the content of the element a, the relationships: 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 are satisfied, which has a metal structure wherein .alpha. phase and .kappa. phase and/or .gamma. phase are present and, with respect to [b] % representing the content of the phase b, the relationships: f4 = [.alpha.] + [.gamma.] + [.kappa.] >= 85 and f5 = [.gamma.] + [.kappa.] + 0.3[µ] - [.beta.] = 5 to 95 are satisfied, and which has an average crystal grain diameter of 200 µm or less in a macroscopic structure immediately after the solidification of a melt of the alloy.

Cette invention concerne un alliage de cuivre dont la composition chimique, en % en masse, est: Cu: 69 à 88 %, Si: 2 à 5 %, Zr: 0,0005 à 0,04 %, P: 0,01 à 0,25 %, le reste étant constitué de Zn, et ladite composition chimique satisfait les relations: f0 = [Cu]- 3,5[Si] - 3[P] = 61 à 71, f1 = [P]/[Zr] = 0,7 à 200, f2 = [Si]/[Zr] = 75 à 5000 et f3 = [Si]/[P] = 12 à 240, où [a] % en masse représente la teneur de l~élément a. Ledit alliage a une structure métallique où les phases .alpha. et .kappa. et/ou .gamma. sont présentes et qui satisfait les relations: f4 = [.alpha.] + [.gamma.] + [.kappa.] >= 85 et f5 = [.gamma.] + [.kappa.] + 0,3[µ] - [.beta.] = 5 à 95, où [b] % représente la teneur de la phase b. Ledit alliage possède des grains cristallins d~un diamètre moyen de 200 µm ou inférieur dans une structure macroscopique immédiatement après la solidification de l~alliage en fusion.

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