JPS5967341A - Electrical contact material - Google Patents

Abstract

PURPOSE:To improve the welding resistance, consumption resistance and contact resistance characteristics of the resulting electrical contact material by internally oxidizing a material consisting of Bi, Sn, Mn, an iron group element and the balance Ag. CONSTITUTION:A material consisting of, by weight, 0.1-5% Bi, 1-10% Sn, 1-5% Mn, 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 is a recess in an electrical contact material.

Electrical contact +11'- manufactured by conventional internal oxidation method
As one of the first methods, ζζ silver acid oxide has been used.

Air-oxidation series J, contact 1 with excellent wear resistance and welding resistance
! However, there is a drawback that the resistance of the contact 111B becomes high due to the accumulation of oxides.

Therefore, the layer of the present invention is preferable to the contact 11 (
As a result of intensive research to develop an electrical contact material with excellent contact properties in terms of resistance to z1, we have discovered a satisfactory electrical contact material.

The electrical contact of the present invention (1 material is bismuth 0.1 to 5% by weight)
, Zuzu 1-10% by weight, Manganese 1-5% by weight, tJ
It is a material consisting of 0.01 to 0.5% by weight of Group I elements and the balance being silver, and is internally oxidized.

In the electrical contact material of the present invention, the reason is that bismuth is 0.1-5% by weight, tin is 1-10% by weight, manganese is 1-5% by weight, and iron group elements are 0.01-0.5% by weight. If it is less than 0.1% by weight of bismuth, it will not have the effect of promoting internal oxidation (K), if it is less than 1% by weight, sufficient welding resistance will not be obtained, and if it is less than 1% by weight of manganese, the welding resistance will be poor. If the iron group element is less than 0.01% by weight, it will not have the effect of uniformly and finely dispersing hismuth oxide, mankanoxide, and tin oxide to reduce consumption due to discharge, and if the iron group element is less than 0.
If it exceeds this, the melting point of the alloy will drop too much and internal oxidation will be difficult at high temperatures! If it exceeds 10% by weight of tin, the oxidized tin will aggregate and the contact resistance will become unstable, and if it exceeds 5% by weight of manganese, the electrical conductivity will decrease and wear resistance against arc heat and Joule heat will decrease. If the iron group element exceeds 0.5% by weight, it will segregate itself.
5% by weight, tin 1-10% by weight, manganese 1-5% by weight
Within the range of 0.01 to 0.5% by weight of the iron group element, an electrical contact material with sufficiently satisfactory welding resistance, wear resistance, and contact resistance properties 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 materials having the compositions of Examples 1 and 2 shown in the left column of the table below to form atomized powder, the mixture was heated at 600°C, 9 atm,
After internal oxidation for 2 days, this oxidized atomized powder was compressed and sintered, extruded and drawn, then cut and processed into a header, with a head diameter of 5 mm, head height of 1 mm, leg diameter of 2.5 mm, and leg length of 2. 5mm fixed contact, head diameter 4mm, head height 1.1mm
, a movable contact with a leg diameter of 2.8 mm, a leg length of 1.6 mm, and a spherical head shape of 5R was obtained.

However, the rivet-type electrical contacts made using the electrical contact materials of Examples 1 and 2 and the same dimensions made using the materials of the comparative examples and conventional examples shown in the left column of the table below in the same manner as in the examples. A rivet-type electrical contact was assembled into a hinge-type relay and an opening/closing test was conducted under the following test conditions, and the results shown in the right column of the table below were obtained.

Test conditions Voltage: AC100V 50Hz Current:
Input 40A, steady 10A load: Resistance Switching frequency: 20 times/min Switching/closing frequency: Welding salt contact force: 40g Breaking force: 45g As is clear from the table above, the electrical contacts were made using the electrical contact materials of Examples 1 and 2. Rivet-type electrical contacts have superior contact resistance characteristics compared to rivet-type electrical contacts made from conventional electrical contact materials, have superior abrasion resistance compared to comparative examples, and have better welding and abrasion resistance than conventional electrical contact materials. It turns out that it is almost equally good.

As detailed above, the electrical contact material of the present invention has contact resistance characteristics that are superior to those of conventional electrical contact materials, so it can be said to be an epoch-making material that can replace conventional electrical contact materials. .

Claims (1)

[Claims] His-7su(), 1-5% 9%, Suzu 1-10%. Manganese 1-5% by weight, + Group 4 elements 0, 01-0.5
An electrical contact material which is internally oxidized, with the remainder being NeH by weight.