JPS5967340A - Electrical contact material - Google Patents

Abstract

PURPOSE:To improve the welding resistance, consumption resistance, dielectric strength and insulation resistance of the resulting electrical contact material by internally oxidizing a material having a specified composition consisting of Bi, Sn, Sb, an iron group element and the balance Ag. CONSTITUTION:A material consisting of, by weight, 0.1-5% Bi, 3-10% Sn, 1-10% Sb, 0.01-0.5% iron group element and the balance Ag is melted and atomized to form atomized powder. The atomized powder is internally oxidized, compressed, and sintered to obtain an electrical contact material.

Description

[Detailed description of the invention] The present invention relates to electrical contact materials.

Silver-antimony oxide has conventionally been used as one of the electrical contact materials manufactured by the internal oxidation method. Silver-antimony oxide has excellent contact performance in terms of contact resistance and welding resistance, but is subject to large wear due to arcing and is inferior in voltage resistance and insulation resistance.

Therefore, the inventor of the present invention has conducted extensive research to develop an electrical contact material that has contact characteristics that are superior to this electrical contact material in terms of wear resistance, voltage resistance, and insulation resistance, and has developed a satisfactory electrical contact material. This is what I discovered.

The electrical contact material of the present invention contains 0.1 to 5% by weight of bismuth,
It is a material consisting of 3 to 10% by weight of tin, 1 to 10% by weight of antimony, 0.01 to 0.5% by weight of iron group elements, and the balance silver, and is internally oxidized.

In the electrical contact material of the present invention, 0.1 to 5% by weight of bismuth and 3 to 10% by weight of bismuth. Antimony 1-10% by weight
The reason why the iron group element was set at 0.01 to 0.5% by weight is that when 0.1% by weight of bismuth is not used, antimony oxide does not precipitate uniformly and finely, and there is no effect of improving wear resistance. If less than 0.01% by weight of iron group elements, good results will not be obtained in terms of welding resistance and abrasion resistance, if less than 1% by weight of antimony, sufficient welding resistance will not be obtained, and if less than 0.01% by weight of iron group elements, bismuth oxide, tin oxide There is no effect of uniformly and finely dispersing antimony oxide and antimony oxide to reduce consumption due to discharge, and bismuth 5
If it exceeds 10% by weight, the melting point of the alloy will drop too much and internal oxidation at high temperatures will become difficult, if it exceeds 10% by weight, the processability will deteriorate, and if it exceeds 10% by weight, the melting point of the alloy will drop and it will become difficult to perform internal oxidation at high temperatures. Internal oxidation becomes impossible, wear resistance deteriorates, and if the iron group element exceeds 0.5% by weight, it segregates itself, so bismuth 0.1 to 5% by weight and tin 3 to 1%
0% by weight. Within the range of 1 to 10% by weight of antimony, the welding resistance. An electrical contact material having sufficiently satisfactory wear resistance, voltage resistance, and insulation resistance can be obtained.

Next, in order to clarify the effects of the electrical contact material according to the present invention, specific examples, comparative examples, and conventional examples will be described.

After melting the material having the composition of Example 1.2 shown in the left column of the table below and making it into atomized powder, it was heated at 600°C. Internal oxidation was carried out at 9 atmospheres for 2 days, and the oxidized atomized powder was compressed and sintered, extruded and drawn, then cut and processed into headers, with a head diameter of 5 mm, head height of 1 mm, leg diameter of 2.5 mm, Fixed contact with leg length 2.5mm, head diameter 4mm, head height 1.1m
A movable contact with a spherical head shape of 5R and a leg diameter of 2.8 mm and a leg length of 1.6 mm was obtained.

However, rivet-type electrical contacts made using the electrical contact materials of Examples 1 and 2 and rivet-type electrical contacts of the same size made using the materials of the conventional examples shown in the left column of the table below in the same manner as in the examples. When electrical contacts were assembled into a hinge-type relay and a switching test was performed under the test conditions below, the results shown in the right column of the table below were obtained.

Test condition voltage = ACIOOV. 50Hz, current 2 inputs 40A, steady state 10A Load: Resistance Switching frequency: 20 times/min Switching/closing frequency: Contact force until welding occurs: 40g Breaking force: 45g Regarding the withstand voltage, apply 8C 1200V between the contacts for 10 seconds to check for leakage. Pass if the current is less than lomA, 10
If it was m8 or higher, it was judged as a failure.

As is clear from the above table, the rivet type electrical contacts made with the electrical contact materials of Examples 1 and 2 have higher voltage resistance and higher voltage resistance than the rivet type electrical contacts made with the electrical contact materials of the conventional and comparative examples. It can be seen that the abrasion resistance is excellent and the welding resistance is almost as good as that of the lagoon.

As detailed above, the electrical contact material of the present invention has contact characteristics that are superior in voltage resistance and wear resistance than conventional electrical contact materials, so it is an epoch-making material that can replace conventional electrical contact materials. It can be said that it is a thing.

Claims (1)

[Claims] A material consisting of 0.1-5% by weight of bismuth, 3-10% by weight of tin, 1-10% by weight of antimony, 0.01-0.5% by weight of iron group elements, and the balance being internally oxidized. Electrical contact materials.