JPH0762189B2 - Silver-oxide type electrical contact material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver-oxide type electrical contact material which has excellent welding resistance and wear resistance and, as a result, exhibits a long service life.

[0002]

2. Description of the Related Art Conventionally, many electric contact materials have been proposed,
In addition, it has been put into practical use by being incorporated in various electric and electronic devices. Among these many electric contact materials, one widely used electric contact material is, for example, JP-B-55-4825. As described in the official gazette, by weight% (hereinafter,% means% by weight), Sn: 5 to 10%, In: 1 to 6%, and, if necessary, Fe, Ni, and C.
One or more of o: 0.01 to 0.5%,
Ag-oxidation, which is obtained by applying an internal oxidation treatment to an Ag alloy containing Ag and the balance consisting of Ag and unavoidable impurities, that is, an internal oxidation treatment in which a temperature of 650 to 750 ° C is maintained for a predetermined time in an oxidizing atmosphere. Physical electrical contact materials are known.

[0003]

On the other hand, in recent years, the performance and electric service life of electric and electronic devices have been remarkably increased,
Along with this, there is a tendency that the electrical contact materials incorporated therein are required to have further improved welding resistance and wear resistance, but the above conventional electrical contact materials and many other electrical contact materials are At present, the welding resistance and the wear resistance are insufficient, and it is not possible to satisfy these requirements in a satisfactory manner.

From the above viewpoints, the present inventors have paid special attention to the above-mentioned conventional electrical contact material, and conducted research to further improve the welding resistance and wear resistance thereof. , Sn: 5.1~8.5%, in: 1.5~3.5%, Te: 0.1~0.8%, Cd: 0.1~1%, contains, as further required Depending on, Fe, Ni, and C
1 type or 2 types or more of o: 0.05-0.2 %,
The silver-oxide-based electrical contact material obtained by subjecting an Ag alloy containing Ag and the balance of Ag and inevitable impurities to the internal oxidation treatment under the above-mentioned ordinary conditions is the conventional silver-oxide-based electrical contact material described above. We obtained the research results that it has more excellent welding resistance and wear resistance than contact materials.

The present invention was made based on the above research results, and the reason why the composition of the Ag alloy before the internal oxidation treatment of the silver-oxide type electrical contact material is limited as described above is as follows. Will be explained.

(A) Sn The Sn component has a function of mainly forming an oxide to improve the welding resistance, but if the content thereof is less than 5.1 %, the desired excellent welding resistance is obtained. it is not possible, whereas when the content exceeds 8.5%, on the contact resistance of the contact
As the rising tendency comes to appear and the workability at the time of manufacturing is lowered, the content thereof is 5.1 to
It was set at 8.5 %.

(B) In The In component has the action of promoting the oxidation of the Sn component and also forming an oxide by itself to improve the welding resistance and wear resistance, but its content is 1. If it is less than 5 %, the desired remarkable improvement effect cannot be obtained, while if it exceeds 3.5 %, the welding resistance tends to decrease . It was set at 5 to 3.5 %.

(C) Te The Te component forms an oxide that easily sublimes when an arc is generated by opening and closing a contact, and has the effect of further improving the welding resistance and wear resistance, but its content is 0.1. If the content is less than 0.1%, the desired remarkable improvement effect cannot be obtained, while if the content exceeds 0.8 %, the workability tends to decrease. 0.1 to 0.8 %
I decided.

(D) Cd The Cd component has a function of further improving the welding resistance in the coexistence with the Te component, but its content is 0.1 %.
If the content is less than 1, the desired excellent welding resistance cannot be obtained , and if the content exceeds 1 %, the wear resistance tends to decrease . It was set to 1 to 1 %.

(E) Fe, Ni, and Co These components have the function of forming a solid solution in the base material to make the oxide and Ag particles finer, thereby improving the welding resistance, so they are contained as necessary. However, its content is 0.05
If it is less than 0.1 %, the desired excellent improving effect on the above-mentioned action cannot be obtained, while if the content exceeds 0.2 %, the workability is deteriorated.
Since the tendency becomes so that appear, the content of 0.
It was set at 1 to 0.2 %.

[0011]

EXAMPLES Next, the silver-oxide type electrical contact material of the present invention will be specifically described by way of examples. Using an ordinary high-frequency melting furnace, Ag alloys having the component compositions shown in Tables 1 and 2, respectively, were melted and cast into ingots under the usual conditions, and the thickness was hot extruded. : 5mm thick plate, width: 30mm by hot and cold rolling
× Thickness: A thin plate with a thickness of 0.6 mm, and this thin plate was sliced along the length direction to a width of 2 mm.
In an oxygen atmosphere, a temperature of 700 ° C. was maintained for 24 hours to perform an internal oxidation treatment, and then the cut pieces after the internal oxidation treatment were put together and compression-molded into a billet having a diameter of 70 mm. Is extruded to a diameter of 7 mm and then drawn to form a wire with a diameter of 2 mm, and finally from this wire with a header machine, head diameter: 4 mm x
By forming a rivet having dimensions of head thickness: 1 mm x foot diameter: 2 mm x foot length: 2 mm, the silver-oxide type electrical contact material of the present invention (hereinafter referred to as the present contact material) 1 to 16 and the conventional one. Silver-oxide type electrical contact materials (hereinafter referred to as conventional contact materials) 1 to 6 were manufactured.

[0012]

[Table 1]

[0013]

[Table 2]

Then, using various types of contact materials obtained as a result, using an ASTM electrical contact tester, DC voltage: 24 V, making current: 100 A, breaking current: 20 A, energizing time: 1 second ON-9 seconds OFF, An electrical test was performed under the conditions of contact force: 100 g, opening force: 100 g, number of times of opening and closing: 5000 times, the number of times of welding and the amount of wear were measured, and the welding resistance and wear resistance were evaluated. The measurement results are shown in Tables 1 and 2.

[0015]

From the results shown in Tables 1 and 2, all of the contact materials 1 to 16 of the present invention show much better welding resistance and wear resistance than the conventional contact materials 1 to 6. it is obvious. As described above, the silver-oxide-based electrical contact material of the present invention has excellent welding resistance and wear resistance, and therefore, when incorporated into various electrical and electronic devices and put to practical use, these electrical and electronic devices It has industrially useful characteristics such as the fact that there are some major factors that contribute to higher performance and longer service life of the equipment.

Claims (2)

[Claims] 1. By weight%, Sn: 5.1 to 8.5 %, In: 1.5 to 3.5 %, Te: 0.1 to 0.8 %, Cd: 0.1 to 1 %. A silver-oxide-based electrical contact material having excellent welding resistance and wear resistance, which is obtained by internally oxidizing an Ag alloy having a composition including Ag, and the balance being Ag and inevitable impurities. 2. A weight%, Sn: 5.1~8.5%, In : 1.5~3.5%, Te: 0.1~0.8%, Cd: 0.1~1% , And one or more of Fe, Ni, and Co:
A silver-oxide type electrical contact excellent in welding resistance and wear resistance, which is obtained by internally oxidizing an Ag alloy containing 0.05 to 0.2 % and the balance being Ag and inevitable impurities. material.