JPS6075541A - Copper alloy having superior heat resistance, mechanical characteristic and electric conductivity - Google Patents

Abstract

PURPOSE:To obtain the titled Cu alloy by adding a specified amount of In to a Cu alloy having a specified composition contg. Fe and/or Mg and P and/or B. CONSTITUTION:This Cu alloy consists of, by weight, 0.02-3% Fe and/or Mg, 0.006-1% P and/or B, 0.01-0.5% In and the balance Cu. A Cu alloy contg. Fe and/or Mg and P and/or B has improved heat resistance, mechanical strength and high electric conductivity peculiar to Cu. By adding In to the Cu alloy, the characteristics are further improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a copper alloy having excellent heat resistance, mechanical properties and electrical conductivity. The copper alloy of the present invention can be used, for example, as a conductor for electric wires,
It is useful as lead wires and lead frames for electronic components, spring materials, tube materials, and fin material for fugiators.

Copper alloys have been used for the past several thousand years, and a wide variety of copper alloys have been put into practical use depending on their respective uses. In recent years, higher heat resistance, mechanical properties, electrical conductivity, and thermal conductivity have been required for copper alloys for electronic, electrical, and mechanical parts such as spring materials, pipe materials, and radiator materials. It has become.

As an example of copper alloys conventionally used for these purposes, 0
There are u-Fe-P and/or B alloys. This alloy is F
By precipitating and dispersing e-P and/or B intermetallic compounds in the form of fine crystals in steel, its heat resistance and mechanical strength are improved and the high conductivity inherent to copper is maintained. Depending on the application, further improvements in heat resistance and mechanical properties may be required.

As a result of various studies in view of the current situation as described above, the present inventor has discovered that by adding a specific amount of In to a copper alloy with a specific composition, in addition to the excellent electrical conductivity and thermal conductivity inherent to copper, It was discovered that a copper alloy with significantly superior properties and mechanical properties could be obtained, leading to the completion of the present invention. That is, in the present invention, at least one of Fe and Mg is 0.02 to 8% by weight, and at least one of P and B is 0.006 to 1% by weight.
The present invention relates to a copper alloy containing 0.01 to 0.5% by weight of In and the remainder being copper containing unavoidable impurities and having excellent heat resistance, mechanical properties, and electrical conductivity.

In the present invention, it is essential that the content of Fe and/or Mg1 P and/or B and In be within specific ranges. These additive components are interrelated and affect the physical properties of the copper alloy, so it is not necessarily appropriate to discuss the reasons for each limitation individually, but if we can provide the reasons for the limitations, they are as follows: It is.

The content of Fe and/or Mg is 0.02 to 8% by weight. If this content is less than 0.02% by weight, the improvement mainly in heat resistance and mechanical properties will not be sufficient, while if it exceeds 8% by weight, mainly the electrical conductivity and thermal conductivity will deteriorate, making it impractical. gradually lost.

The content of P and/or B is 0.006 to 1% by weight. When the content of P and/or B is less than 0.006% by weight, there is little contribution to improving mechanical properties;
On the other hand, if it exceeds 1% by weight, F'e and/or Kg
Since unreacted components remain, the electrical conductivity and thermal conductivity of the copper alloy are impaired.

The content of In is 0.01 to 0.5% by weight.

If the In content is less than 0.01% by weight, the effect of improving heat resistance and mechanical properties is small, while if it exceeds 0.5% by weight, although the heat resistance and mechanical properties are further improved, the tetraelectric property This decreases the amount of energy and increases the cost, making it impractical.

The copper alloy of the present invention has excellent heat resistance, mechanical properties, electrical conductivity, and thermal conductivity, is easy to manufacture and process, and is inexpensive, so it can be used as a material for parts of electronic, electric, and communication equipment, such as springs, pipes, etc. It is useful for structural materials such as radiator fins.

Examples will be shown below to further clarify the features of the present invention.

Example 1 After melting electrolytic copper while covering it with charcoal in a high-frequency melting furnace, a predetermined amount of additives was added to obtain a uniform molten metal.

Next, the molten metal is poured into a carbon mold to have a diameter L80t.
An ingot of nm x length 700 mm was obtained. On this occasion,
In order to prevent oxidation of the alloy, the casting work was carried out while blowing argon into the tap and tap. The cast ingot was cut, surface-finished, hot-extruded at about 900°C, and water-cooled to obtain a rough wire with a diameter of 11 mm. Cold wire drawing was performed using Btnml.

The following tests were conducted using the various copper alloy wires thus obtained.

(a) Effect of addition of In on heat resistance and mechanical strength. The alloy wire of the present invention with a cold working rate of 99% containing 1% by weight, 4% by weight of Po, and 1% by weight of InQ was specified. The curve I in FIG. 1 shows the change in tensile strength to M when the specimen is held at that temperature for 1 hour. In addition, Fe0,1% and P O
.

As is clear from FIG. 1, when the heat treatment i11 temperature is 200° C. or lower, the presence of In has no substantial effect on the tensile strength. However, when the temperature exceeds 800°C, there is a clear difference in heat resistance depending on whether In is contained in the copper alloy. That is, when an In-containing steel alloy is used as a cold-worked hard material, it is clear that the decrease in mechanical strength is small under a temperature condition of 850 to 450°C.

In addition, when this kind of copper alloy is heat treated after cold working to improve elongation and conductivity (the heat treatment temperature is usually 400°C
It can be said that the presence of In improves the mechanical strength of the copper alloy.

(b) Effects of additive elements on tensile strength and electrical conductivity What is the tensile strength and electrical conductivity when various copper alloys with a diameter of 0.8 mm obtained by the above-mentioned cold wire drawing are vacuum heat treated at 400'O for 1 hour? The d ratio is shown in Table 1. Furthermore, in Table 1,
The amount of additive elements such as B'e is 1% by weight, and the remainder of the alloy consists essentially of copper.

The elongation of each alloy wire was about 15%, and almost no difference was observed.

Table 1 As is clear from the results shown in Table 1, the steel alloy of the present invention has the following properties:
By solution annealing at about 900'C, cold working, and then heat treating at about 400°C, it exhibits excellent heat resistance, mechanical strength, and electrical conductivity.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the heat resistance and mechanical properties of the copper alloy of the present invention, where curve 1 shows the characteristics of the copper alloy of the present invention containing In, and curve 1 shows the properties of the comparative copper alloy that does not contain In. Show characteristics. (And more) Figure 1 Nekkoku 1ri 5L degrees (°C) Continuation of page 1 ■ Inventor Kawabata Distension @1 Inventor Tatsuo Kanezai

Claims (1)

[Claims] ■ At least 0.02 to 8% by weight of Fe and Mg
, 0.006 to 1% by weight of at least one of P and B, and 0.01 to 0.5% by weight of In, with the remainder consisting essentially of copper, and has excellent heat resistance, mechanical properties, and conductivity. Copper alloy with excellent properties.