JPS6086253A - Preparation of high-strength conductive copper alloy - Google Patents

Abstract

PURPOSE:To prepare an inexpensive high-strength conductive copper alloy excellent in strength, springiness and corrosion resistance, by applying heat treatment to a copper alloy having a specific composition containing Zn, P, Sn and Al, and further containing B, Ni or the like under a proper condition after final cold rolling. CONSTITUTION:An alloy, containing, on a wt. basis, 10-40% Zn, 0.005-0.070% P, 0.5-1.0% Sn and 0.05-1.00% Al, and further containing one or more of 0.005-0.1% B, As and Sb, one or more of 0.005-1.0% Ni, Si, Fe, Co, Cr, Mn, Te, In, Ti, Zr, Hf, Be, Mg, Ag, Cd and Ge, and 0.005-0.3% Pb in the sum total of 0.005-2.0% and comprising the remainder of Cu and inevitable impurities, is subjected to final cold rolling and thereafter, heat treated at 150-700 deg.C for 30sec-20hr to obtain a high-strength conductive copper alloy enhanced in strength and springiness and also excellent in corrosion resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for heating a copper alloy described below at 150°C to 700°C for 30°C.
The present invention relates to a manufacturing method that simultaneously improves strength, especially tensile strength, elongation, and springiness by heat treatment for 20 seconds to 20 hours.

Traditionally, tan and yellow porcelain have been widely used as materials for electronic and electrical parts because of their excellent workability and low cost. However, in recent years, equipment and packaging have become smaller,
Due to weight reduction, there is a strong demand for further increase in strength.
Furthermore, since the corrosion resistance is poor, there is a strong demand for improving the corrosion resistance.

The present invention takes into consideration this point and is inexpensive and strong.

This relates to a manufacturing method for maximizing the properties of an alloy that has excellent spring properties and excellent corrosion resistance. 1. It is believed that the most excellent properties can only be expressed under the heat treatment conditions specified in the present invention. I found it.

And the present invention contains zinc 10 to 40 wt%, pn 0.00
5-0.070wt, tin Q, 05-1. Mr. Owt,
Aluminum 0.05~1. Contains OwtZ, and further contains boron αO05~0.1 wtZ, nickel Q, On
5-1. OwtZ.

Kei g 0.005~1. OwtZ, iron 0.005
~1. OwtZ, lead 0.005-0.3 wteI)
, :Imelt 0.005-1. OwtZ, chromium 0.005-1. OwtZ, Manganese α005~1
．． 0 Wtc.

Tellurium 0.005~1, Owt width, Indium [100
5~towtZ, titanium 0.005~1. Owt
Z, zirconium 0.005-1. OwtZ,
Hafnium 0.005-1.0 wtfD.

Beryllium 0005-1.0wt%, Magnesium 00
05-to wt96, silver 0.005-1. Owt
4, Cadmium 0005-1.0vrt, Germanium Q, 005-1. Owt staff.

Arsenic 0005~0.1wt, antimony 0005~0
．． 1wt% of any one or two or more types in total 0005
~2. After the final cold rolling, the alloy containing OwtZ and the balance copper and unavoidable impurities was heat treated at 150°C to 700°C for 30 seconds to 20 hours to obtain a strength of 2.

The present invention provides a method for producing a high-strength conductive copper alloy that improves spring properties.

As a result, the tensile strength, elongation, and spring limit value could be significantly improved at the same time as shown in FIG. 1 when the two products were manufactured using the method of the present invention.

Next, the reason for limiting the alloy components will be explained. The reason why the zinc content group is set to 10 to 40 wt is that the zinc content is j O'
wt% wtZ has low strength and zinc content is 40 wt4
If the temperature exceeds 100%, a large amount of β phase will precipitate.

This is because the material properties become unstable.

The reason why the phosphorus content is set to 0.005 to 0.070 w14 is that the phosphorus content is 0.005 to 0.070 w14. If the phosphorus content is less than O05wt4, the strength will be low and no improvement in corrosion resistance can be expected.
This is because if it exceeds 0.070 wtφ, the conductivity decreases and intergranular corrosion tends to occur.

The reason why the C content is set to 0.05 to 1, Owt96.

If the tin content is less than 5wt4, the strength will be low; This is because if it exceeds 0 wtl, the conductivity will drop significantly.

The reason why the aluminum content is set to 0.05 to 1.0 wtZ is that if the aluminum content is less than 0.0 swt, the strength is low, and if the aluminum content is less than 1.0 wt.
This is because if it exceeds %, workability decreases and the conductivity decreases significantly.

The predetermined amounts of boron and nickel as subcomponents.

Silicon, iron, cobalt, chromium, manganese.

Tellurium, indium, titanium, zirconium.

Hafnium, beryllium, magnesium, silver.

The total amount of one or more selected from the group consisting of cadmium, kermanium, arsenic, and antimony is 0, O05wt%
If it is less than that, a high-strength alloy cannot be obtained.

This is because, if the content exceeds 2.0 wt %, the conductivity, properties and soldering properties will be significantly reduced.

150 limited the heat treatment temperature to 150℃ to 700℃
Below ℃, the heat treatment effect does not appear.

This is because at temperatures exceeding 700°C, the material softens in a short period of time. And the most preferable heat treatment temperature is 200℃
~600°C.

The reason why the heat treatment time is limited to 30 seconds to 20 hours is because if it is less than 30 seconds, the material properties will not be stable, and if it exceeds 20 hours, it will lose its economic value.

FIG. 1 is a graph showing the relationship between the tensile strength and the spring limit value before and after heat treatment.2 After the heat treatment of the present invention, both the tensile strength and the spring limit value are significantly improved.

Next, the present invention will be explained in detail.

Example An alloy having the composition shown in Table 1 was melted to obtain an ingot with a thickness of 30 mm. Next, the ingot was hot rolled at approximately 700℃ to a thickness of 8
After setting it to zero, turn the first surface sideways. After cold rolling to a thickness of 1.0 ROM.

The sample was baked and then final rolled to a thickness of 0.5 and heat treated at 200°C for 1 hour. This sample was pickled with sulfuric acid of about 10 times the strength, and the tensile strength, elongation, and spring limit values were measured. .

Table 1 shows that after heat treatment, tensile strength, elongation, and spring limit value all improved at the same time.

From the above examples and FIG. 1, the manufacturing method of the present invention has a
This alloy has improved spring properties and is an excellent material for electrical and electronic parts, especially conductive spring materials.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the relationship between tensile strength and spring limit value before and after heat treatment of Alloy 50. Patent applicant Nippon Mining Co., Ltd. Agent Patent attorney (7569) Keishi for general use Figure 1 Tensile strength type (Kg/mm2)

Claims (1)

[Claims] (1) Zinc 10-10-4O, phosphorus 0.005-0.
070 wt%. Tin 0.05-1.0 wt (support), aluminum 0.0
5-1, contains Owt'Z, and further contains boron [1005
-0.1wt%, Nickel #0.005-1. Owt%
, silicon 00o5~1. Owt staff, iron 0005~1
．． Owt ratio, lead 0.0 O5~0.3 wt ratio, cobalt 0005~1.0wt%, chromium 0005~1.0w
t%, manganese 0.005-1.0wt%. Tellurium 0.005-1.0wt%, Indium 0005
~1, owt%, titanium 0.005-1. Owt%,
Zirconium 0005-1.0wt%, Hafnium 0
．． ．． 005-1. Owt%, beryllium 0.005
-1.0 wt%, magnesium 0005~i, 0
wt%, tin 0.005-10wt, cadmium 0.005-1. Germanium 0005~1.0w
t%, arsenic 0005-0.1wt jealousy. Antimo:/0.005-Q, any one of 1'X1ii or two or more of 1 wt% in a total of 0005-2. Owt
A method for producing a high-strength conductive copper alloy, in which an alloy consisting of 4.4 and the balance silver and unavoidable impurities is heat treated at 150° C. to 700° C. for 30 seconds to 20 hours after final cold rolling to improve strength and springiness.