JPH01309219A - Terminal for electric apparatus made of cu alloy - Google Patents

Abstract

PURPOSE:To make it possible to obtain a high strength, an excellent conductibility, and an excellent thermal creeping property by composing a Cu alloy including a specific amount of Mg and P, and Cu and inebitable impurities in the remaining component. CONSTITUTION:The terminal is composed of a Cu alloy including 0.3 to 2% of Mg, and 0.001 to 0.1% of P, and consisting of Cu and inebitable impurities in the remaining % (wt.%). The Mg component has a function to improve the strength and the thermal creeping property without losing the high conductibility the main component Cu alloy itself provides, by fusing solidly to the base material of the Cu. The P component has not only a deoxidization function, but also a function to improve the strength and the thermal creeping property on condition of coexisting with the Mg component. A high strength, an excellent conductibility, and an excellent thermal creeping property can be obtained, consequently.

Description

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

[Conventional technology]

Generally, in the production of terminals for various electrical devices, the following is used in weight% (hereinafter % indicates weight%): Sn: 1.5 to 9%, P: 0.03 to 0.35%, A Cu alloy having a composition in which the remainder consists of Cu and unavoidable impurities is used.

[Problem that the invention seeks to solve]

However, although the above-mentioned conventional Cu alloy terminals for electrical equipment have high strength, they do not have sufficient conductivity and thermal creep properties, so when they are made smaller or have a more complex shape, they cannot fully perform their functions. The current situation is that there is no such thing.

[Means for solving problems]

Therefore, from the above-mentioned viewpoints, the present inventors conducted research to develop a terminal for electrical equipment with excellent conductivity and thermal creep characteristics, and as a result, developed a terminal for electrical equipment with Mg: 0. 3-2%, P:(1,0(11-0.196, , as well as excellent conductivity and thermal creep properties, they found that they can fully cope with miniaturization and complex shapes, and exhibit excellent performance.

This invention was made based on the above knowledge, and the reason why the component composition was limited as described above will be explained below.

(a) Mg The Mg component has the effect of improving strength and thermal creep properties by being dissolved in the Cu matrix without impairing the high conductivity of Cu itself, which is the main component. If the content is less than 0.3%, the desired effect cannot be obtained, while if the content exceeds 2%, the conductivity will be impaired, so the content should be reduced to 0.3%.
It was set at ~2%.

(b) p In addition to having a deoxidizing effect, the P component also has the effect of improving strength and thermal creep properties when coexisting with the Mg component; however, if its content is less than o, ooi%, the above effect will not be achieved. The desired effect cannot be obtained, and if the content exceeds 0.1%, a tendency towards embrittlement appears, so the content was set at 0.001 to 1%.

〔Example〕

Next, the terminal for electronic equipment according to the present invention will be specifically explained with reference to Examples.

Molten Cu alloys shown in Table 1 were prepared using an ordinary low-frequency groove induction furnace, and casted by a semi-continuous casting method to a thickness of:
150mm x Width = 400mm x Length: After casting into an ingot with dimensions of 1500mm, 710~8
Hot rolling is performed at a predetermined rolling start temperature within the range of 00°C to obtain a hot rolled sheet with a thickness of 11 m+e, and then after water cooling, the upper and lower surfaces of the hot rolled sheet are side-faced by 0.5 mm each to give a thickness of 11 m+e. difference:
In the state of 1 oin, cold rolling and annealing were repeated alternately under normal conditions, and a cold rolled plate with a thickness of 0.25 m + w was obtained at a final finishing rolling rate of near 5%, and finally
Terminal materials of the present invention 1-
5 and conventional terminal cord material 1.2 were manufactured, respectively.

Next, for the terminal materials 1 to 5 of the present invention and the conventional terminal 1.2 obtained as a result, the tensile strength and spring limit value were measured for the purpose of evaluating the strength, and the conductivity was measured for the purpose of evaluating the conductivity. (IAcs%), and in order to further evaluate the thermal creep properties, the stress relaxation rate after stress application and heating was measured.

The spring limit value is measured by the JIS-H3130 moment test, and the stress relaxation rate is width = 12.7.
mm x length: 120 m1 (hereinafter referred to as Lo), use a test piece with a length of 7110 m1.
The test piece is set in a jig having a horizontal longitudinal groove with a depth of 3 m+++ in a curved manner so that the center part of the test piece bulges upward. The distance between both ends of the test piece at this time: 110 mm is defined as Ll), In this state, the temperature is maintained at 150°C for 1000 hours, and after heating, it is removed from the jig) and calculated using the formula: (Lo-L2)/(Lo-Ll) x 100 (%) I asked for it. These results are shown in Table 1.

〔Effect of the invention〕

From the results shown in Table 1, terminal materials 1 to 5 of the present invention are as follows:
It is clear that both of these materials maintain high strength equivalent to that of conventional terminal material 1.2, but have far superior conductivity and thermal creep properties.

As mentioned above, the terminal for electrical equipment of the present invention is made of a Cu alloy that has high strength, excellent conductivity, and thermal creep properties, so it is suitable for miniaturization and complicated shapes. Not only does it have sufficient performance, it is made of a Cu alloy that does not contain the expensive Sn component, so it has industrially useful properties such as being relatively inexpensive. It is.

Claims (1)

[Claims] Consisting of a Cu alloy containing Mg: 0.3 to 2%, P: 0.001 to 0.1%, and the remainder consisting of Cu and unavoidable impurities (the above weight %) A terminal for electrical equipment made of a Cu alloy, which has high strength and excellent conductivity and thermal creep properties.