JPH02107732A - High strength and high conductivity copper base alloy - Google Patents

Abstract

PURPOSE:To improve the strength, elasticity, electrical conductivity, heat resistance or the like of the title alloy by specifying Ni, Be, Zn, Ti, Cr, Zr, Fe, etc. CONSTITUTION:The title copper base alloy is formed with the compsn. constituted of, by weight, 0.05 to 5% Ni, 0.005 to 1.5% Be, 0.01 to 5% Zn and the balance Cu, or in addition to this, furthermore of 0.005 to 2% of one or more kinds among Ti, Cr, Zr, Fe, Co, Sn, Pb, Al, Bi and P. The above alloy has high strength, high elasticity and high electrical conductivity and has excellent stress relaxation characteristics and heat resistance. The alloy furthermore has sufficient solder weather ability.

Description

Detailed Description of the Invention (a) Technical field The present invention relates to a high-strength, high-conductivity copper-based alloy suitable for electrical and electronic materials such as wire harness terminals used in electrical components of automobile parts, etc. It is related to.

(b) Prior art Today, as is well known, the automobile industry has come to play a major role as Japan's core industry, and the number of automobiles produced has increased significantly, and with the recent development of car electronics, Copper materials are becoming more and more popular.

Therefore, wire harnesses, which play a role in the electrical equipment of automobiles, are no exception, and each vehicle now uses wire harnesses that are about 1 km long, 9 weight, and about 20 kg.

However, the demands placed on cars these days are becoming increasingly strict, such as weight reduction, high reliability, and low cost.
Accordingly, wire harnesses are also required to be lighter in weight, more reliable, and lower in cost.

Here, a wire harness is a combination of electric wires and terminals, and in order to reduce weight and increase wiring density, it is necessary and essential to improve the material properties and reliability of the terminal material.

Under the above background, the terminal material is specifically made thinner and press-molded into a complicated shape, so it is necessary to have good strength, elasticity, conductivity, and press-formability.

Furthermore, in addition to having good corrosion resistance and stress corrosion cracking resistance, it must also have excellent stress relaxation properties since thermal loads are applied around the engine room and exhaust gas system.

However, in the past, it has not been possible to obtain a material that simultaneously has the above-mentioned properties and is inexpensive.

(C) Disclosure of the Invention With the development of car electronics, the present invention provides a copper-based alloy 1 which has the above-mentioned properties required for a terminal material for a wire harness. Excellent properties and press formability, #
The following copper-based alloy was developed as a result of intensive research to develop a copper-based alloy suitable as a wire harness terminal material with excellent stress relaxation properties.

That is, in the first invention, Ni: 0.05 to 5.
0 support 7%, B e: 0.005-1.5 wt%
, Zn: 0.01 to 5.0 wt%, the balance being Cu and unavoidable impurities.

Moreover, the second invention provides Ni: 0.05 to 5.0w.
t%, B e : 0.005 to 1.5 wt%, Z
n: 0.01 to 5.0 wt%, further containing Ti,
Cr, Zr, Fe, Co.

A high-quality aluminum alloy containing a total of 0.005 to 2.0 wt% of one or more selected from the group consisting of Sn, Pb, A, Bi, and P, with the balance consisting of Cu and unavoidable impurities. It is a steel-based alloy with high strength and high conductivity.

The basic feature of the copper-based alloy according to the present invention is that through the addition of Ni, Be, and Zn, the copper-based alloy exhibits the characteristics listed in L that are necessary for a copper-based alloy suitable as a terminal material for wire harnesses. There is.

Next, the reason why the composition range of the copper-based alloy according to the present invention is limited as described above will be explained.

(1) Ni Ni is an element 2V that forms a compound with Be and contributes to properties such as strength, elasticity, heat resistance, and stress relaxation resistance.

Further, it has the effect of refining the cast M1 weave and hot worked structure and preventing coarsening of crystal grains during solution treatment.

In order to exhibit such an effect, the Ni content value must be 0.
．． If it is less than 0.05 wt%, the desired effect cannot be obtained;
If the content exceeds 0 wt%, the electrical conductivity will drop significantly and it will also be economically disadvantageous, so the content should be in the range of 0.05 wt% to 5.0 wt%.

(2) Be Be is less than Ni when its content is less than 0.005 vt%.
Even when the Be content coexists with Be, the desired effects cannot be obtained in terms of strength, elasticity, heat resistance, stress relaxation resistance, etc. On the other hand, when the Be content exceeds 1.5 wt%, electrical conductivity decreases and press forming The content is 0.005 to 1.5 wt because it significantly reduces the properties and is also economically disadvantageous.
% range.

(3) Zn Zn forms a solid solution in the Cu matrix and improves strength and elasticity without significantly impairing workability and electrical conductivity. It is also an element that effectively prevents welding during heat treatment, and also functions as a deoxidizing agent during melting and casting, and is also effective in removing oxide films during hot rolling and pickling after heat treatment. do.

In addition, the weather resistance of the copper-based alloy solder plating according to the present invention is also effective. In addition, there is a high possibility that the terminal material of the wire harness will be exposed to salt water, and in such a case, Cu ions will be eluted from the copper alloy that is the terminal material, causing a short circuit. This effectively suppresses the elution of Cu ions. Therefore, the short circuit phenomenon is also suppressed.

In order to exhibit such an effect, 0.01wt%
The following content is required, but on the other hand, 5. If the content exceeds Q wt%, the electrical conductivity will be significantly lowered and the stress corrosion cracking resistance will also be lowered.

Therefore, the acid content of Zn is 0. O is set in the range of 1 to 5.0 wt%.

(Subcomponent Furthermore, Ti, Cr, Zr, and Fe are added as subcomponents.

Co, Sn, Pb, Al, Bi
*N is one or more types selected from the group consisting of P.
By incorporating i, Be, and Zn into the copper-based alloy of the first invention, the strength of the copper-based alloy of the first invention can be improved without significantly impairing the workability and electrical conductivity of the alloy of the first invention. 9. The opening properties such as elasticity, thermal properties, and stress relaxation properties can be further improved. In addition, the above subcomponents are
It also contributes to the refinement of crystals during casting, hot rolling, and heat treatment.

In order to fully exhibit such effects, one or more selected from the subcomponents listed in L must be added in a total of 0.005%.
It is necessary to contain 2.0 wt% or more, while 2.0 wt%
If it is contained in excess of It will be disadvantageous.

Therefore, the range of content of the above-mentioned subcomponents is 0.005 to 2.0 wt% in total of one or more kinds.

Next, one embodiment of the present invention will be specifically explained using examples.

(D) Examples Example 1 Copper-based alloy No. whose chemical composition values (wt%) are shown in Table 1,
1-No. 14 was melted using a high frequency induction melting furnace,
It was cast into an ingot measuring 20 x 50 x 220 (am).

However, the atmosphere during melting and casting was set to an Ar gas seal, and water cooling was performed immediately after casting. After facing each ingot.

Cold rolling and annealing were repeated until the thickness was 0.8 am.

Thereafter, after heat treatment at a temperature of 815° C. for 10 minutes, quenching with water was performed, and further acid washing was performed.

The heat-treated material obtained as described above was cold-rolled to a thickness of 0.3 ml, and heat-treated at a temperature of 500° C. for 30 minutes to obtain a test material.

Each predetermined test piece was prepared using the obtained test material, and the tensile strength, electrical conductivity, and solder resistance were measured. The results are shown in Table 1.

As for the measurement method, tensile strength and conductivity are measured using J15-
Z-2241, JIS-H-0505+: Accordingly.

In addition, the solder weather resistance was determined by applying molten solder plating (Sn) to the test piece.
-40wt%Pb, De4-/P, 260°C x 5sec,
After holding in the atmosphere at a temperature of 150° C. for 300 hours, the test piece was bent by 90° W and the bent portion was observed. 'The results of M1 inspection are shown in Table 1 with the marks ○ indicating that the plating is adhered, and the marks X indicating that the plating has peeled off.

From the results shown in Table 1, No. 1 to 1 according to the present invention
The copper-based alloy No. 9 has an excellent balance of tensile strength and electrical conductivity,
It also has good solder weather resistance. Therefore, it is a copper-based alloy that has very excellent properties and is suitable as an electrical and electronic material such as a terminal for a wire harness.

On the other hand, comparative alloy No. 10 that does not contain Zn
Comparative alloy No. 14, which contains more Ni than the composition range of the present invention, has poor solder weather resistance.

Comparative alloys No. 13 and No. 14 Te, which have a larger amount of Zn than the compositions rs and 1iii of the present invention, and No. 14 te, which have a larger amount of Nii, have low electrical conductivity and no improvement in tensile strength is observed.

Furthermore, the tensile strength of comparative alloys No. 12, which does not contain Ni, is lower than that of the alloy of the present invention;
o, 11 has low tensile strength and TL ratio.

(The following is a blank space) Example 2 The hardness,
Tensile strength, spring limit value, electrical conductivity, stress relaxation properties, and heat resistance were tested and measured. The results are shown in Table 2.

The measurement tests for tensile strength and electrical conductivity were the same as in Example 1, and the hardness and spring limit values were measured using J l
5-Z-2244 and JIS-H3130.

In addition, in the stress relaxation test, the stress at the center of the test piece was 40 kg.
U-shaped bending is performed so that f/mmz is obtained, and the bending after holding at a temperature of 150°C for 200 hours is taken as the stress relaxation rate.
Calculated using the following formula.

Stress relaxation rate (X) = [(LI L2 ) / (LI LO) IXlo
oLo: Length of jig (■intestinal) Ll: Sample length at start (II+1) Lz: Horizontal distance between sample ends after processing (mm) Furthermore, in the heat resistance test, the hardness of the sample is 8O of the initial hardness. % (held for 30 minutes).

(Margin below) From the results shown in Table 2, the copper-based alloy of the present invention.

It can be seen that the conductivity, stress relaxation properties, and heat resistance are significantly improved compared to phosphor bronze, which is a typical conventional electrical and electronic material such as wire harness terminals. Therefore, the copper-based alloy of the present invention has high environmental resistance,
It is clear that the reliability is extremely high.

(E) Effects of the Invention As is clear from the following Examples, the copper-based alloy according to the present invention has high strength, high elasticity, and high electrical conductivity12, and has excellent stress relaxation resistance and heat resistance. Furthermore, it has sufficient solder weather resistance, making it ideal as a material for electrical and electronic applications such as wire harness terminals.

Moreover, the alloy of the present invention is an epoch-making copper-based alloy suitable for terminals, which can fully respond to the recent trend toward smaller and lighter automotive electrical components and higher c&' temperature wiring.

Claims (2)

[Claims] (1) Ni: 0.05 to 5.0 wt%, Be: 0.005-1.5wt%, Zn: 0.01-5.0wt%, Remainder: Cu and inevitable impurities, A high-strength, high-conductivity copper-based alloy characterized by comprising: (2) Contains Ni: 0.05 to 5.0 wt%, Be: 0.005 to 1.5 wt%, Zn: 0.01 to 5.0 wt%, and further contains Ti, Cr, Zr, Fe, Co, Sn,P
One or two selected from the group consisting of b, Al, Bi, and P
1. A high-strength, high-conductivity copper-based alloy comprising a total of 0.005 to 2.0 wt% of at least one species, with the remainder consisting of Cu and unavoidable impurities.