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Calendered Copper Foil

A technology of rolling copper foil and copper alloy, which is applied in the field of rolling copper foil, can solve the problems of bending fatigue fracture, excessive size, unsatisfactory FFC strength and bending characteristics, etc., and achieve the effect of suppressing the generation of cracks

Active Publication Date: 2016-02-24
FURUKAWA ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the conductor of Japanese Patent Laid-Open No. 2009-048819 has slight processing deformation in the crystal grains, so there is a problem that it is easy to break quickly when bending fatigue in a high-temperature environment
[0010] In Japanese Patent Application Laid-Open No. 2010-150578, in order to obtain the final rectangular conductor, it is manufactured by continuous rolling of copper strips. Therefore, compared with the manufacturing method of rolling the round wire obtained by the wire drawing process in the final stage, There is a problem of high cost
[0011] In addition, in Japanese Patent Laid-Open No. 2001-262296, in addition to the problem of high cost caused by rolling copper strips and repeated cold rolling and annealing, there are also problems of excessively large average particle size of 5 μm to 30 μm, and failure to meet FFC Questions of required strength and flexural properties

Method used

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  • Calendered Copper Foil
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0077] Such as image 3 As shown, a Φ0.30mm hard copper wire (round wire type) was prepared by drawing a Φ2.6mm annealed copper wire. This hard copper wire was rolled using a calender (without lubrication) having a roll of Φ100 mm to form a foil-like product having a thickness of 0.080 mm and a width of 0.8 mm. Then, the foil was heat-treated (annealed) at 400° C. for 5 sec in a salt bath, and then quenched by water cooling after the heat treatment (annealed), to obtain a rolled copper foil.

[0078] Using the aforementioned method, calculate the average particle size of the crystal grains constituting the outermost layer surface, the ratio of the average particle size to the thickness of the rolled copper foil, and analyze the section perpendicular to the longitudinal direction of the rolled copper foil by the EBSD method, according to The intragranular deformation rate calculated by the above formula (1). The results are shown in Table 1.

Embodiment 1-2

[0080] In the above-mentioned embodiment 1-1, after stretching the annealed copper wire of Φ2.6mm, further implement heat treatment at 300°C for 2h to prepare an annealed copper wire (round wire type) of Φ0.30mm to replace the Φ0 Except for the hard copper wire (round wire type) of .30mm, the rolled copper foil was obtained by the method described in Example 1-1.

Embodiment 2-1

[0093] Such as image 3 As shown, a Φ0.20mm hard copper wire (round wire type) was prepared by drawing a Φ2.6mm annealed copper wire. This hard copper wire was rolled using a calender (without lubrication) having a roll of Φ100 mm to form a foil-like product having a thickness of 0.035 mm and a width of 0.8 mm. Then, the foil was heat-treated (annealed) at 300° C. for 1 sec in a salt bath, and then quenched by water cooling after the heat treatment (annealed), to obtain a rolled copper foil.

[0094] Using the aforementioned method, calculate the average particle size of the crystal grains constituting the outermost layer surface, the ratio of the average particle size to the thickness of the rolled copper foil, and analyze the section perpendicular to the longitudinal direction of the rolled copper foil by the EBSD method, according to The intragranular deformation rate calculated by the above formula (1). The results are shown in Table 2.

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Abstract

A rolled copper foil composed of crystal particles of copper or a copper alloy, wherein an average particle size of the crystal particles composing the outermost surface is not less than 0.2 µm and not greater than 6 µm; a ratio of the average particle size of the crystal particles composing the outermost surface to a thickness of the rolled copper foil is not less than 1% and not greater than 6%; and an intragranular distortion rate found by the following formula (1) when a cross-section perpendicular to a length direction of the rolled copper foil is analyzed by electron backscatter diffraction (EBSD) is not less than 0.5% and not greater than 10%. Intragranular distortion rate % = A / B x 100 (In the above formula (1), (A) represents the area of a region identified through image analysis to have an orientation difference of not less than 1 degree and not greater than 15 degrees, and (B) represents the area of a region identified through image analysis to have an orientation difference of not less than 0 degrees and not greater than 15 degrees).

Description

technical field [0001] The present invention relates to a rolled copper foil composed of crystal grains of copper or copper alloy, and more particularly to a rolled copper foil used for flexible flat cables and the like used in products such as auto parts and the like. Background technique [0002] Flexible flat cables (FFC) are widely used in various applications due to their thin thickness and excellent flexibility, and they are widely used in various applications because there are few restrictions on the shape and a high degree of freedom when they are installed in electronic equipment and other products. For example, it is used in the steering rod connector (SRC) that constitutes the automobile airbag system, the bending part of the folding mobile phone, the movable part such as the digital camera, the printing head, HDD (Hard Disk Drive: hard disk drive), DVD (Digital Versatile Disc: digital multiple Functional CD), CD (CompactDisk: high-density disk) and other optical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/08B21B1/40B21B3/00H05K1/09C22F1/00
CPCB21B1/40B21B2003/005C22C9/00C22F1/00C22F1/08H05K1/09H05K2201/0355H05K2203/1105H05K2203/1121Y10T428/12431
Inventor 吉田和生相宫奈央子浅见和彦西田龙司
Owner FURUKAWA ELECTRIC CO LTD