JPS62250136A - Copper alloy terminal and connector - Google Patents

Abstract

PURPOSE:To provide high strength, superior electric conductivity and thermal creep characteristics to a terminal and a connector by using a Cu alloy contg. specified amounts of mg, P and Cr. CONSTITUTION:A terminal and a connector are made of a Cu alloy consisting of 0.3-2wt% Mg, 0.001-0.1wt% P, 0.05-0.5wt% Cr and the balance Cu with inevitable impurities. In the composition, Mg enters into a solid soln. in Cu and improves the strength and thermal creep characteristics of the alloy without deteriorating the high electric conductivity, P improves the strength and elastic limit value in a state coexisting with mg, and Cr improves the strength and thermal creep characteristics in a state coexisting with Mg. When the Cu alloy is used, a terminal and a connector each having a reduced size and a complexed shape can be obtd. The Cu alloy is inexpensive because it does not contain Sn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to terminals and connectors made of a Cu alloy that has high strength and excellent conductivity and thermal creep properties.

[Conventional technology]

Generally, in the manufacture of terminals and connectors, 3n: 1.5 to 9% by weight (hereinafter % indicates weight M%).

P: 0.03-0.35%.

A Cu alloy is used which has a composition containing Cu and the remainder consisting of Cu and unavoidable impurities.

[Problem that the invention seeks to solve]

However, although the above-mentioned conventional Cu alloy 1J terminals and connectors have high strength, they do not have sufficient conductivity and thermal creep properties, so if they are made smaller or have a more complex shape, they may not fully utilize their functions. is the current situation.

(Means for solving the problem) Therefore, from the above-mentioned viewpoint, the present inventors conducted research to develop terminals and connectors that have not only high strength but also excellent conductivity and thermal creep characteristics. As a result, M! ]: 0.3-2%.

p: 0.001-0.1%.

Cr: 9.05-0.5%.

Terminals and connectors made of a Cu alloy with a composition of 1 and 1 and the rest consisting of Qu and unavoidable impurities have high strength, excellent conductivity and heat resistance.

Kotori et al. 1-. They obtained the knowledge that even if 11 is made smaller and more complex in shape, it still exhibits excellent performance over a long period of time.

This invention has been made based on the above findings, and uses a furnace whose component composition is limited as described above.

(a) MO M'0 component contains Cu by solid solution in wood base.
The high conductivity possessed by Cu itself, which is the main component, is used to improve the strength and -clinib properties. However, if the warpage content is less than 0.3%, the desired effect cannot be obtained, while if the content exceeds 2%, not only the conductivity will be impaired, but also the alloy melting process will be affected. Since the castability of the alloy also deteriorates, its content is set at 0.3 to 2%.

(b) P In addition to having a deoxidizing effect, the P component also has the effect of improving strength and spring limit values when coexisting with the Mill component, but if its content is less than 0.001%, the above effects will not be achieved. The desired effect cannot be obtained, and if the content exceeds 0.1%, a tendency towards embrittlement appears, so the fN content was set at 0.001 to 0.1%.

(C) Cr The Cr component has the effect of further improving the strength and thermal creep properties and increasing F when coexisting with the Ml) component, and also has the effect of suppressing embrittlement due to the inclusion of the P component. .0
If the content is less than 5%, the desired effect cannot be obtained, while if the content exceeds 0.5%, the conductivity will decrease and linear precipitates will easily appear on the product surface. Therefore, the content was determined to be 0.05 to 0.5.

〔Example〕

Next, the terminal and connector of the present invention will be specifically explained using examples.

Using a normal low frequency groove induction furnace, Cu alloy WIS shown in Table 1 was prepared, and by semi-continuous casting method, thickness: 150a*X width: 400aw*X width: 1500ae
After casting into an ingot with dimensions of w, 71
Hot-strength rolling was performed at a predetermined rolling start temperature within the range of 0 to 760°C to obtain a hot-rolled plate with a thickness of 111, and then, after cooling with water, both upper and lower sides of the hot-rolled plate were faceted by 0.5 am. Then, with a thickness of 10 mm, cold rolling and annealing were alternately repeated under normal conditions, and a cold rolled plate with a thickness of 0.25 mm was obtained at a final finishing rolling rate of near 5%. finally 250
Predetermined 8 within the range of ~400°C! Terminal/connector materials 1 to 5 of the present invention, comparison terminal/connector materials 1 to 5, and conventional terminal/connector materials 1.2 were each manufactured by subjecting them to strain relief annealing under the condition of holding for 30 minutes at a time.

Next, this conclusion! $! For the various terminal/connector materials obtained, the tensile strength and spring limit values were measured for the purpose of evaluating the tension, and the conductivity, t, and
The i ratio (1ΔC8%) was measured, and the stress relaxation rate after applied additional heating was also measured for the purpose of evaluating thermal creep characteristics.

In addition, comparison terminal/connector materials 1 to 5 are all CI
Content of any of the constituents of J alloy (first
Items marked with * in the table) were manufactured using a Cu alloy with a composition outside the scope of this invention.

In addition, the spring limit value is measured by the JIS-H3130 moment test, and the stress relaxation rate is width: 12
．． 71111+1X length: 120#lIl+ (hereinafter 1-
Use a test piece with the dimensions of 110 mm (length: 110 #IIIX depth: 3 m) and place it in a jig with the center part of the test piece expanding upward. The distance between both ends of the test piece at this time is 1.
fl[:llOs and set to 1), in this state temperature = 1
It was held at 50 ° C. for 1000 hours, and after heating, the distance between both ends of the test piece (hereinafter referred to as L2) in the state where it was removed from the shellfish was measured, and according to the 81 formula: % formula % () It was obtained by calculation. These results are shown in Table 1.

〔Effect of the invention〕

From the results shown in Table 1, the terminal/connector materials 1 to 5 of the present invention all maintain the same high strength as the conventional terminal/1 connector material 1.2, but have even better conductivity. It is clear that it has thermal creep properties.

On the other hand, as seen in comparative terminal/connector element 441-5, if the content of any of the components of the Cu alloy constituting this element falls outside the scope of the present invention, the strength, conductivity,
At least one of the thermal creep properties and thermal creep properties is inferior, and a product having all of these properties cannot be subjected to VJ. Furthermore, comparative terminal/connector material 5 has large linear precipitates. It was seen.

In addition, if the P content is outside the range of this invention, the product will have excellent strength, S conductivity, and thermal creep properties, but will become extremely brittle and have poor bending workability. there were.

As mentioned above, the terminals and connectors of the present invention are made of a Cu alloy that has high strength, excellent conductivity, and thermal creep properties, so they are suitable for miniaturization and complicated shapes. Not only does it exhibit satisfactory performance, but it also has industrially useful properties such as being relatively inexpensive as it is made of a Cu alloy that does not contain the 3n component. It has.

Claims (1)

[Claims] A composition containing Mg: 0.3 to 2%, P: 0.001 to 0.1%, Cr: 0.05 to 0.5%, with the remainder consisting of Cu and inevitable impurities. Terminals and connectors made of a Cu alloy having high strength and excellent conductivity and thermal creep properties, characterized in that the terminals and connectors are made of a Cu alloy having a weight percentage of (by weight).