JPS6164837A - Copper alloy for flexible print - Google Patents

Abstract

PURPOSE:To obtain a copper alloy for a flexible print having superior flexibility and electric conductivity by incorporating specified percentage of Fe and P into Cu. CONSTITUTION:The copper alloy consisting of 0.05-0.15wt% Fe, 0.025 -0.04wt% P, and the balance Cu with impurities is manufactured. this copper alloy is easy to bend and twist, so it is suited for use as a material for the heater of automobile seat, carpet, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a copper alloy for flexible printing, and more particularly to a copper alloy for flexible printing that has excellent flexibility and good conductivity.

[Prior Art 1 A flexible printed wiring board is a relatively new component among printed wiring boards, and its major feature is that it utilizes flexibility.

This flexible printed wiring board was first used as a substitute for electric wires and cables where flexibility was required, and is currently mainly used as a substitute for electric wires and cables.

Therefore, flexible printed wiring boards can be used as three-dimensional wiring materials for devices such as cameras, calculators, and telephones by bending or twisting due to their flexibility. It is also used for wiring to moving parts of electronic devices such as printer heads.

Furthermore, recently, it has come to be used as a heating material for carpets with heaters inserted and car chairs, and with the adoption of local heating systems, the heater as an electrode material has excellent flexibility. Flexible printed wiring boards have come into use.

Considering the possibility of electrical leakage in the heater as an electrode material, it is necessary to suppress the voltage applied between one terminal of the heater as low as possible, and for this reason, the electrical resistance of the heater material itself must be reduced, for example. , conductivity 85% lAC
Must be 3 or more.

Tough-pitch copper has been mainly used as a material for flexible printed wiring boards, but tough-pitch steel is a soft material used as a heating material for carpets and car chairs, and has an excellent electrical conductivity of approximately 100% lAC3. Therefore, it has been desired to develop a material for use in flexible printed wiring boards that has flexibility that is one level better than tough pitch steel.

[Problem to be Solved by the Invention 1] The present invention has been made in view of the current state of the materials for conventional 7-layer/pull printed wiring boards explained above, and has excellent flexibility and is , developed a copper alloy for flexible printing that has a conductivity of 85%lAC3 or higher.

[Means for solving the problem 1 The characteristics of the copper alloy for flexible printing according to the present invention are as follows: Fe 0.05~0.15+aL%, P 0.025~
It contains 0.04 WL%, and the remainder consists of Cu and impurities.

The copper alloy for flexible printing according to the present invention will be explained in detail below.

First, the components and component ratios of the 7-rekin 1-rube 1-nontokawa t1-i alloy according to the present invention will be explained.

Fe is an element that forms iron phosphide when contained simultaneously with P 01025-0.04+ut% and improves iiJ'flexibility j:, L4electricity, and the content is 0.05... If the content is less than 0.1%, no improvement in flexibility can be expected, and if the content exceeds 0.15%, Fe, which does not react with P, will dissolve in the matrix, reducing the electrical conductivity to 85%lAC3 or more. The only thing I can do is Therefore, the Fe content is 0.05
~0.15-F%.

As explained above, P is an element that forms iron phosphide when contained together with Fe to improve flexibility and electrical conductivity, and if the content is less than 0.025 wt%, it will cause desorption of the molten metal. If the acid content exceeds 0.04 wt%, a healthy ingot cannot be obtained due to insufficient acid content.
F that cannot form iron phosphide between 0.05 and 0.15+ut%
e remains as a solid solution in the matrix, and the conductivity decreases. Therefore, if P is in the range of 0.025 to 0.04 vL%, Fe 0.05 to 0.15 IIL% and iron phosphide (F
e=P) can be formed to improve visibility and conductivity.

In addition, even if Sn is contained up to 0.1 wL% in addition to the above-mentioned components, the conductivity and flexibility as a copper alloy for flexible printing will be reduced to 1! i1 No harm done.

[Example 1] Next, an example of the copper alloy for flexible printing according to the present invention will be described.

Examples Table 1 shows copper alloys for flexible printing according to the present invention (
It is sometimes simply referred to as the copper alloy of the present invention. ) and the contained components and component ratios of comparative alloys.

The copper alloy of the present invention is melted and cast in a conventional manner, and the width is 4 mm.
The ingot is made into an ingot of 20mm thick, 14saun thick, and about 401mm long, and this ingot is hot rolled at a temperature of 850 to 900℃, and then rolled to a thickness of 15mm with shower water from a temperature of 0℃ or higher. Cool to room temperature within minutes, and
- front and back, cold rolled to a thickness of 3 mm, further annealed in an NJ furnace at 500°C for 2 hours, and
It was cold-open-rolled to a thickness of 0.03 f) mm with four-high rolls, and a test piece of 200 mm long and 2 t) OLIm was cut out and immersed in a saltpetre furnace at a temperature of 500°C to prepare an annealed material. .

On the other hand, for the comparison alloy, an ingot with the same dimensions as the copper alloy of the present invention was
Hot rolling was started at a temperature of SO"C and rolled to a thickness of 15 mm. Since this comparative alloy is not a precipitation type alloy, the upper and lower surfaces were milled by 0.2m+n and then heated with N2 at a thickness of 0.5inH.
It was annealed in a gas furnace at a temperature of 400°C for 2 hours, cold-open rolled with 4-high rolls to a thickness of 0.031) ROM, and a length of 20 mm.
Cut out a test piece with a width of 0 mm and a width of 2 Of) mm.
The material was immersed in an oil bath at a temperature of .degree. C. for 20 seconds to obtain an annealed material.

The copper alloy properties and electrical conductivity of the copper alloy of the present invention and the comparative alloy of the foils having a thickness of 0.030 mm thus adjusted were measured, and the results are shown in Table 2.

In addition, a test piece with a width of 20 mm was attached to a fatigue resistance test (MIT test doctor) specified in JISPS115, and a static load St)Og was applied to it, and the test piece was bent ±135° (bending radius 0. 38 mm) was repeated, and the flexibility was evaluated by measuring the number of times the test piece was bent until it broke. The results are shown in Table 2.

As is clear from Table 2, the copper alloy of the present invention has much better flexibility than the comparative alloys, with a flexibility of about 211 or more, and also has good mechanical properties.

[Effects of the Invention 1 As explained above, the copper alloy for flexible printing according to the present invention has the above-mentioned structure and has excellent flexibility and good electrical conductivity. It has the advantage that it is superior to tough pitch copper as a bending and twisting material for carpets, automobile chair heaters, etc.

Claims (1)

[Claims] Fe0.05~0.15wt%, P0.025~0.0
A copper alloy for flexible printing, characterized in that it contains 4 wt% of Cu, and the remainder consists of Cu and impurities.