EXTRA FINE COPPER WIRE AND ITS PRODUCTION

Japanese Patent JP3718036

B2

PROBLEM TO BE SOLVED: To prevent the generation of disconnection caused by softening in cold wire drawing and to eliminate the increase of the number of times of annealing in the process of the cold annealing by composing an extra fine copper wire having a specified diameter, which is composed of tough pitch copper in which the content of oxygen is specified, of a soft copper wire whose tensile strength is < the specified value and incorporating one or more kinds of tin and indium in specified ratios.
SOLUTION: An extra fine copper wire having 0.02 to 0.05 mm diameter composed of tough pitch copper contg. >100 to 500 ppm oxygen is produced. At this time, casting for the tough pitch copper is executed by a continuous casting machine such as SRC, a soft copper wire having <35 kg/m2 tensile strength is used, and the metal of tin and/or indium is incorporated by 5 to <200 ppm. In this way, the production cost can be reduced, the reduction of the tensile strength and elongation caused by the secular change in room temp. preservation after wire drawing is prevented, and the tough pitch copper extra fine copper wire suitable for the core wire of an extra fine enameled wire is obtd.

Takaro Ichikawa
Masayoshi Aoyama
Kazuhiro Yamada
Tsutomu Takahashi
Nagayama Hidetoshi

JP31519997A

November 16, 2005

November 17, 1997

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Hitachi Cable Ltd.

B22D21/00; C22C9/00; (IPC1-7): C22C9/00; B22D21/00

JP547237A
JP6132135A
JP6283041A
JP827531A
JP6296629A
JP613856A
JP6123735A
JP6123737A

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