JPH03115537A - Terminal-connector material made of high strength cu alloy - Google Patents

Abstract

PURPOSE:To provide the material with high strength and to exhibit its excellent electrical conductivity and heat resistance for a long period of time by incorporating specified amounts of Mg, P and Ti into a Cu alloy. CONSTITUTION:The terminal-connector material is formed from a Cu alloy having the compsn. constituted of, by weight, 0.3 to 2% Mg, 0.001 to 0.1% P, 0.03 to 0.5% Ti and the balance Cu with inevitable impurities. The alloy material is prepd. by using an ordinary low frequency channel induction furnace. The material exhibits excellent performance when applied to the one having a miniaturized or complicated shape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a terminal/connector material made of a Cu alloy that has excellent electrical conductivity, heat resistance, and high strength.

[Conventional technology]

Generally, in weight % (hereinafter % indicates weight %), Sn::
A terminal/connector material made of a Cu alloy (phosphor bronze) is known, which has a composition of P: 0.5 to 9%, P: 0.03 to 0.35%, and the remainder consisting of Cu and unavoidable impurities.

[Problem that the invention seeks to solve]

However, the conventional Cu alloy terminal/connector materials mentioned above are
Although they have high strength, they do not have sufficient conductivity or heat resistance, so terminals and terminals have become smaller or more complex in recent years.
Currently, it cannot be applied to connectors.

[Means for solving problems]

Therefore, from the above-mentioned viewpoint, the present inventors developed terminals and connectors made of Cu alloy with the aim of ensuring particularly high conductivity in order to develop terminal/connector materials that have excellent conductivity and heat resistance as well as high strength. - As a result of research focusing on connector materials, Mg: 0.3-2%, P: 0. The terminal/connector material is made of a Cu alloy containing QO 1~0.1%, Ti: 0.03~0.5%, and the rest is Cu and unavoidable impurities.It has high strength and excellent properties. Research results showed that it has excellent conductivity and heat resistance, and exhibits excellent performance over a long period of time.

This invention was made based on the above research results, and the reason why the composition range of the Cu alloy constituting the terminal/connector material was limited as described above will be explained below.

(a) Mg The Mg component has the effect of improving strength and heat resistance without impairing conductivity by forming a solid solution in the matrix of the Cu alloy, but if its content is less than 0.3%, The desired effect was not obtained in the above action, and on the other hand, the content was 2%.
If it exceeds C, the conductivity will be impaired and C
Since deterioration phenomena also appear in the castability of the u alloy, its content was set at 0.3 to 2%.

(b) p The P component not only has a deoxidizing effect on the molten Cu alloy, but also improves the strength and heat resistance when coexisting with the Mg component, and also reacts with TI to form a compound that improves the Tl component. It has the effect of suppressing the decrease in conductivity due to solid solution in the Cu alloy matrix, but if the content is less than o,oot%, the desired effect cannot be obtained;
%, the Cu alloy tends to become brittle, so its content was set at 0.001 to 0.1%.

(c) Tl The Tl component forms a compound as described above and has the effect of improving strength and heat resistance, but when its content is 0.
．． If the content is less than 0.03%, the desired high strength cannot be achieved, while if the content exceeds 0.5%, the electrical conductivity will be impaired and it will be difficult to ensure high electrical conductivity. Therefore, its content was determined to be 0.03 to 0.5%.

〔Example〕

Next, the Cu alloy terminal/connector material of the present invention will be specifically explained with reference to Examples.

Molten Cu alloys having the compositions shown in Table 1 were prepared using an ordinary low-frequency groove induction furnace, and cast using a semi-continuous casting method to a thickness of 150mm x width of 400mm x length:
After casting into an ingot with dimensions of 1,500 degrees, this ingot was hot rolled at a predetermined rolling start humidity within the range of 710 to 760°C to form a hot rolled sheet with a thickness of 1. Then, after water cooling, the upper and lower sides of the hot-rolled sheet were turned side by side by 0.5+am to a thickness of 10 mm, and cold rolling and annealing were alternately repeated under normal conditions to give the final finish. The Cu alloy of the present invention is made into a cold-rolled sheet with a thickness of 20 to 25 m at a rolling reduction of 5%, and is finally subjected to strain relief annealing at a predetermined temperature within the range of 250 to 400°C for 30 minutes. Terminal/connector materials 1 to 5 were manufactured, respectively.

For the purpose of comparison, commercially available phosphor bronze materials having the compositions shown in Table 1 were also prepared as the conventional Cu alloy terminal/connector materials 1 and 2.

Next, for the purpose of evaluating the strength of the resulting Cu alloy end terminal/connector materials 1 to 5 of the present invention and the conventional Cu alloy terminal/connector material: 0.2, the tensile strength and spring limit value were determined. , and elongation were measured, and electrical conductivity (IAC 3%) was measured for the purpose of evaluating conductivity, and further, the softening temperature and stress relaxation rate after stress application heating were measured for the purpose of evaluating heat resistance.

The spring limit value was determined to be 1411 by the moment test of JIS-H3130, and the softening temperature was determined by heating and holding the various Cu alloy terminals and connector materials mentioned above at various temperatures for 30 minutes. The subsequent Vickers hardness was determined at 1 lpJ for each heating temperature, and the temperature at which a rapid decrease in hardness was observed was determined based on the measurement results, and this determined temperature was determined as the softening temperature.

In addition, the stress relaxation rate is width: L2.7yam x length: 1
A test piece with the dimensions of 20+U (hereinafter referred to as "D") was used, and the test piece was placed in a jig having a horizontal longitudinal groove of length: 110 mm x depth = 3, with the center part of the test piece facing upward. The curve is set so that it bulges out, and the distance between both ends of the test piece at this time is Ll), and in this state, the temperature = 150.
℃ for 1000 hours, and after heating, the distance between both ends of the test piece (hereinafter referred to as L2) in the state of removing it from the jig was measured, and the calculation formula: (Lo-L2)/
It was calculated by (Lo-Ll)X100(%). These results are shown in Table 1.

〔Effect of the invention〕

From the results shown in Table 1, Cu alloy terminal/connector materials 1 to 5 of the present invention all maintain the same high strength as conventional Cu alloy terminal/connector materials 1 and 2, but are even better than these. It is clear that it has excellent conductivity and heat resistance.

As mentioned above, the Cu alloy terminal/connector material of the present invention has excellent conductivity and heat resistance, and also has high strength. It fully demonstrates excellent performance when applied to shaped objects, and does not contain the expensive Sn component unlike conventional Cu alloy terminals and connector materials, making it a low-cost product that is industrially useful. It has characteristics.

teenager Reason Man Chang Field sum husband 1 other person

Claims (1)

[Claims] A composition containing Mg: 0.3 to 2%, P: 0.001 to 0.1%, Ti: 0.03 to 0.5%, with the remainder consisting of Cu and inevitable impurities. A terminal/connector material made of a high-strength Cu alloy with excellent conductivity and heat resistance, characterized in that it is made of a Cu alloy having a weight percentage of (by weight).