JPS5873737A - Electric contact material - Google Patents

Abstract

PURPOSE:To obtain an electric contact material which has the characteristics equal to those of electric contact materials using Ag-CdO alloys, is inexpensive and is free from pollution problems by contg. Ni, Cu, SnO2 respectively at prescribed ratios and consisting of the balance Ag. CONSTITUTION:An electric contact material consisting of 10-20wt% Ni, 5- 20wt% Cu, 2-10wt% SnO2 and the balance Al, that is consisting of an Ag-Ni- Cu-SnO2 alloy. To manufacture such electric contact mateial, respectively prescrbied contents of Ag, Ni, Cu are mixed, and the mixture is heated to melt in an inert gaseous atmosphere to make a uniform Ag-Ni-Cu alloy. After this alloy is ground finely in a grinder, a prescribed amt. of SnO2 is added thereto and further both are mixed in a ball mill. The powder mixture is compacted and the green compact is sintered by heating in an inert gaseous atmosphere. While the sintered compact is heated, said body is extruded to a columnar material which is then drawn, whereby the wire-like electric contact material is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to materials constituting electrical contacts used to open and close electrical circuits.

Conventionally, silver-cadmium oxide alloy (M1-OaO) was generally used as an electrical contact material, but electrical contacts made of this material generate pollution during the manufacturing process or during use. Equipped with factors.

Therefore, attempts were made to use a silver-nickel alloy (Ni) as an electrical contact material without using or using cadmium. !Since it is produced using the ζ sintering method, the dispersibility of N1 is poor, especially when the blending ratio of N1 is 1.
There was a point where the contact resistance between the contacts increased when it reached 0vt% or more.

In order to solve this interlayer problem, it has been proposed to use an alloy to which copper (Ol) is added as an electrical contact material. In this alloy, N1 and ou are completely dissolved in aζ, and Muf and O also tend to be in solid solution. , -So to speak, a ternary alloy of Mug-Ni-On is achieved, and it is possible to improve the dissipation property of N1 to a good one. - When used as an electrical contact material for Alloy 1, which contains only Ou, in actual use, if consumable corrosion and contact stability are inferior, it is said that until that point, satisfactory results in terms of contact performance cannot be obtained. A new interlayer was born.

Therefore, the inventor of Jin's application conducted various studies in order to solve the problems of the Mu1-N'1-Ou alloy material, and as a result, added 8nO" to Muy-Ni-6u. It was discovered that the above-mentioned problems could be solved by using a "Mug-Ni-Ou-Hatano 1 alloy" material with a certain composition obtained by adding .

[Electrical contact material] Bi is desired to have characteristics such as keeping the contact resistance low when closing the electric circuit, minimizing the amount of wear when opening and closing the electric circuit, and preventing the contacts from welding together even when the circuit is opened and closed frequently. Therefore, in order to satisfy such characteristics, the inventor of this application has developed the above-mentioned Mu-Ni-O.
As a result of investigating the composition of u8nOg alloy, Ni
1G ~20wt%, Ou5~20vt%, BnOg
The reason why the 0 component composition was determined as above to find that a composition consisting of 2 to 10 vt%, P4 moiety f could meet the requirements is as follows.

N1: Added to improve wear resistance and welding resistance.

If Ni is less than 10 vt%, the purpose of addition cannot be achieved, and g
At ovt% or more, even if it becomes a solid solution with O and improves dispersibility, the influence of N1 appears and the contact resistance increases.

゛Ou: Added to improve contact resistance and N1 dispersibility. There is an improvement in N1゛ dispersibility below 0u5vt%:
・,': Not observed at all, and at 20111't,% or more, the welding resistance and abrasion resistance deteriorate.

51n01: Added to improve wear resistance, welding resistance and contact resistance. Below 8 nOg t vt%, the effect of improving welding resistance and abrasion resistance cannot be obtained much;
If it exceeds 10 vt%, the abrasion resistance decreases and workability deteriorates.

Next, an lζ experimental example will be explained.

Experimental Example 1 (see Figure 1) By weight, 178% of Mu, 14% of Ni, and 18% of Ou were added, and the
A uniform mul-Ni-On alloy was prepared by heating and melting. Next, this alloy is crushed into chips of 0.05 to 0.1M using a crusher such as a stamp mill, and 5% of BnOg is added to this crushed product, and the weight ratio is 69.
5%, N11B, 8%, Ou114%, BnOg4.8
%, and further mixed using a ball mill. The mixed powder thus obtained.

The molded body was molded into a size of 20φ×801 cm under a pressure of 4 sheets, and the molded body was heated and sintered at 870° C. for 2B 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 further a wire rod 1 of 8φ was formed by wire drawing.

A piece of 8φ×6' was cut out from this wire to obtain a sample.

Experimental Example 2 (see Figure 2) 1.9% of Ni and 48.1% of Ou were added in terms of weight ratio, and this was heated at tioo"c in an inert gas atmosphere.
A uniform Ni-Ou gold alloy was prepared by heating and melting H1.

Next, this alloy is crushed into chips of 0.06 to 0.1 wg using a crusher such as a stamp mill.
9.6%, N11g, 8%, Oul&4%, 8nOg
The ingredients were prepared to have a composition of 8% and further mixed using a ball mill. Hereinafter, in the same manner as in Experimental Example 1, 8φX
Sample B of 6j was obtained.

The contact resistance, amount of wear, and number of weldings were measured for the above sample products M and B under the following conditions. The results are shown in the table below. In addition, in the table, as comparative examples, comparative product 1 (MU18B-(MO12)) and comparative product 2 measured under the same conditions are shown.
(Ay70-Ni80) and comparative product 8 (Muy707N
The contact resistance, amount of wear, and number of weldings of i16-cuts) were shown simultaneously.

Test conditions Voltage Q 100V Current 6 Load Resistive load contact force 16f Opening/closing frequency 1 time/S Number of opening/closing 100.00011 Table? M welding number is the number of times when the welding force is 8 g or more. From the above table, sample M and B are M1811-06012
It can be seen that jin shows almost the same performance as jin. Moreover, since the amount of Mu f used was about 18vt% less than Mu1g1l-04011, the price was significantly reduced.

As described above, with the electrical contact material of the present invention,
It is possible to obtain an electrical contact having the same characteristics as the -OdO alloy at a low cost, and there is no formation of an interlayer layer.

[Brief explanation of drawings]

#! Figure 1 is an explanatory diagram showing the method of manufacturing the electrical contact material 9 according to the present invention, and Figure #Ig is an explanatory diagram showing another manufacturing method. Figure 1 Figure 2

Claims (1)

[Claims] (1) Ni 10-20wt%%Ou 5-20wt%
, 8n022~10vt%・Remainder ^l Electric contact material set・