Cu-ni-si-co-cr based copper alloy for electronic material...

C - Chemistry – Metallurgy – 22 – C

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C22C 9/06 (2006.01) C22F 1/08 (2006.01) H01L 23/48 (2006.01) C22F 1/00 (2006.01)

Patent

CA 2602529

The invention provides Cu-Ni-Si-Co-Cr copper alloys for electronic materials having excellent characteristics such as dramatically improved strength and electrical conductivity. In one aspect, the invention is a Cu-Ni-Si-Co-Cr copper alloy for electronic materials, containing about 0.5 - about 2.5 % by weight of Ni, about 0.5 - about 2.5 % by weight of Co, about 0.30 - about 1.2 % by weight of Si, and about 0.09 - about 0.5 % by weight of Cr, and the balance being Cu and unavoidable impurities, wherein the ratio of the total weight of Ni and Co to the weight of Si in the alloy composition satisfies the formula: about 4 ~ [Ni+Co]/Si ~ about 5, and the ratio of Ni to Co in the alloy composition satisfies the formula: about 0.5 Ni/Co ~ about 2, and wherein Pc is equal to or less than about 15/1000 µm2, or Pc/P is equal to or less than about 0.3 wherein P is the number of inclusions dispersed in the alloy and having the size of 1 µm or more, and Pc is the number of inclusions, among those having the size of 1 µm or more, whose carbon concentration is 10 % or more by weight.

La présente invention concerne un alliage de cuivre à base de Cu-Ni-Si-Co-Cr pour un matériau électronique dont la résistance mécanique et la conductibilité électrique sont extrêmement améliorées et présentant d~excellentes caractéristiques. L~alliage de cuivre à base de Cu-Ni-Si-Co-Cr pour matériau électronique dont la composition chimique comprend en pourcentage massique Ni : d~environ 0,5 à environ 2,5 %, Co : d~environ 0,5 à environ 2,5 %, Si : d~environ 0,30 à environ 1,2 %, Cr : d~environ 0,09 à environ 0,5 %, le reste étant : Cu et des impuretés inévitables, est caractérisé en ce qu~il présente un rapport de concentration en masse de la somme de Ni et de Co sur Si dans la composition de l~alliage satisfaisant à la formule : environ 4 <= [Ni + Co]/Si <= environ 5 et un rapport de concentration en masse de Ni sur Co dans la composition de l~alliage satisfaisant à la formule : environ 0,5 <= Ni/Co <= environ 2 et en ce que, concernant le nombre (P) d~inclusions dispersées dans le matériau et présentant une taille d~1 µm ou plus et le nombre (Pc) des inclusions mentionnées ci-dessus présentant une teneur en carbone de 10 % en masse ou plus, Pc est d~environ 15 unités/1000 µm2 ou moins ou leur rapport satisfait à la formule : Pc/P <= environ 0,3 ou moins.

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