JPS5889726A - Method of producing electric contact material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to materials for electrical contacts used to open and close electric circuits, more specifically, to
The present invention relates to a method for manufacturing a wire-based electrical contact material.

Conventionally, A has been used as a material for electrical contacts that are widely used for various current ranges from relatively small current ranges to large current ranges.
g -□ao type materials were used, but this material has undergone various improvements in terms of both composition and manufacturing, and now has the welding and wear resistance properties required for electrical contacts. It is thought that this system has reached its limit. Furthermore, voices regarding regulations on the use of cadmium are becoming louder in nearby cities as a pollution problem.

For these reasons, there is currently a need for the emergence of a t% contact material that is a mug-oxide type material other than the mug-040 type and has excellent welding resistance and wear resistance.

Therefore, the inventors of this application have satisfied the above request,
Moreover, it is possible to reduce the amount of mg used compared to the conventional λg-060 series material and achieve a price reduction.
Oxide-based materials were first proposed. This electrical contact material is N
i 10~20wt%, Ou 5~20wt%, 5
nO12~1Q vt% and the remainder λg>, such a mug -Ou -Ni -Bn01
When electrical contacts are manufactured using Ag-based materials, the contact resistance when closing the circuit, wear resistance, and welding resistance are better than those of conventional Ag-0.
(Compared to those using TO-based materials, it can be made completely colorless. However,

When using this type of Ag-0u Ni BnOj based material gold material, what is the content of each component? The quality of the dispersion state in the gas has a large effect on the welding resistance and abrasion resistance when used as electrical contacts, as well as on the difficulty of stretchability when manufacturing electrical contacts. In particular, with the material of the above composition, 8
Because the amount of 1LOIO is very small.

The most important problem in maintaining its properties is how to uniformly disperse this into the mug matrix in a fine state, and if the dispersion state is not good, 8nO
Coarsening and segregation of 1 occur, which not only makes it impossible to maintain the above-mentioned properties but also causes cracks and chips to occur during wire drawing. In addition, mug
Since tl and l1ii do not form a solid solution in tl, a good dispersion state of N1 cannot be obtained by the normal method, and when the blending ratio of Ni particles exceeds 10Wt as mentioned above, its bulk density decreases. The size of the particles is more than twice that of Ag particles, and solid solution between similar metals takes priority, resulting in segregation of 1i1 and deterioration of contact reliability as an electrical contact.

This invention was made in consideration of the above problems, and even when the distribution w of BnDH is small, Ag-
By internally oxidizing the AN alloy powder to make a 8110g composite alloy powder, its uniform dispersibility is ensured, and N
Even if the blending ratio of 1 exceeds 10 Wtl, Ou-Ni
By mixing the alloy powder with the Mug-8nO1 composite alloy powder and sintering the mixture, a good dispersion state of the alloy powder is ensured.

Next, an experimental example will be explained.

EXPERIMENTAL EXAMPLE 5 94.8 wt % of g and 2 vt % of an 5) were mixed and heated and melted at 1000° C. in an inert gas atmosphere to create a homogeneous mug-an alloy. Second, this alloy was made into powder using a crusher, and this powder was internally oxidized by heating to 48°C at 400 to 600°C in an oxygen atmosphere to obtain 5g of 8nO1 composite alloy powder.On the other hand, Ou
43,2'wt% and Ni 5iJ3 Wtl were mixed and melted by heating at 1500 °C for several minutes in an inert gas atmosphere to create a uniform Ou-ML alloy, which was made into powder using a pulverizer. . Next, the two types of powders mentioned above, namely 5g 8110B composite alloy powder and Ou-
Mixed with M1 alloy powder, 4 tons/cd of this mixed powder
This molded body was molded into a size of 20φ x 30t under a pressure of .

Sintering was performed by heating at 720°C for 2H in an inert gas atmosphere. Thereafter, while heating this sintered body to 750°C, it was made into a 6φ columnar object using an extruder, and then it was made into a 6φ columnar object by a wire drawing machine.
A wire with a diameter of φ was prepared, and a piece of this wire with a size of 3φ×61 was cut out to obtain a sample.

Using this sample, the contact resistance, amount of wear, and welding characteristics were investigated under the following conditions. The results are shown in the table below. In the table, Mgaa-o measured under the same conditions as a comparative example is shown.
The contact resistance, wear amount, and welding characteristics of electrical contacts made with AO12 sintered material were simultaneously shown.

Below are the blank test conditions Voltage: 100V Current: 5A Load: Resistance load Contact force: 15F Opening/closing frequency: 1 time/S Opening/closing frequency: 10α000 times Table: The number of welding times is the goIii number when the welding force is 60 or more.

From the table above, the sample products MU 88-AAO 12 and #'t show the same level of contact stability, and the amount of wear is minimal, and the welding properties are also compared to MU GA 88-OAAO 12! It can be seen that #i is 1 for the number of times of welding and the welding force. Moreover, the amount of expensive Mu80 used is less than that of the comparative product.
Furthermore, due to its excellent wear and welding properties, the electrical contact volume is 105 times smaller than that of conventional electrical contacts! Even if it is made smaller, the same level of contact performance as the conventional one can be obtained. Therefore,
The total amount of mg saved was about 40 to 501 g compared to the conventional product.

In addition, when manufacturing an electrical contact material by the method of this invention, the mixing ratio of Ni, Ou and 8nO1 is 1, respectively.
0~20 Wt51G, 5~20 Ytl, 2~10
Ytl is desirable for the following reasons.

Hl: Added to improve wear resistance and welding resistance; if the exi is less than 10vtl, the purpose of addition will not be achieved;
At 0ftli or more, even if dispersibility improves by forming a solid solution with O, for example, ino@hibiki appears and contact resistance increases.

Otl: Added to improve contact resistance and summer i0 dispersibility. Below 0u5Wtfi, no improvement in Hl dispersibility is observed, and above 2gvt, the welding resistance and W4 shaft resistance deteriorate.

8!101: Added to improve wear resistance, welding resistance and contact resistance. If BrLOH is 2wt% or less, the effect of improving adhesion resistance and abrasion resistance cannot be obtained, and 1
At Qvt or higher, wear resistance decreases, workability becomes extremely poor, and internal oxidation of the Mug-In alloy makes it difficult to obtain a Mug-S凰0■ complex alloy. That's it. Even if d, Mug Smog complex alloy alloy −Ni
When mixing alloy powder-72.5:27.5, after mixing s
No, 10Wt, to get % Mg -1! Otori 12 v
This is because the t,4 alloy powder must be internally oxidized.

As described above, according to the method for manufacturing electrical contact materials of the present invention, it is possible to obtain electrical contacts having the same characteristics as those using Mug-010 series materials at low cost, and also to avoid the pollution problem. It never happens.

Claims (1)

[Claims] (1) Ag 8n by Western oxidation of Mug-Sn alloy powder
A method for producing an electrical contact material by mixing and sintering O1 composite alloy powder, If, and Ou-11 alloy powder.