JPS5896834A - Electric contact material - Google Patents

Abstract

PURPOSE:To provide an electrical contact material consisting of prescribed percentages of Ni and one or more among W, Cr and Mo, and the balance Ag, giving stabilized contact resistance, and having superior workability, welding resistance and hardly dissipative property. CONSTITUTION:This Ag-Ni type electrical contact material consists of, by weight, 5-10% Ni, 0.4-2% one or more among W, Cr and Mo, and the balance Ag. An electrical contact made of this electrical contact material has more stable electric resistance than a conventional electrical contact, and it is slightly superior to the conventional contact in welding resistance and is also superior in the stability of the contact resistance. All of W, Cr and Mo have very high hardness and inferior fitness to Ag, yet by uniformly dispersing >=1 kind of the elements in an Ag-Ni alloy, the aggregation of Ni is prevented and the contact performance is enhanced.

Description

[Detailed description of the invention] TECHNICAL FIELD The present invention relates to air contact and plaster materials.

Traditionally, silver-metal oxide based electrical contact materials, #
1-Nickel type, silver-tungsten type, smelt-graphite type, etc. are used. In particular, silver-nickel electrical contacts are resistant to skin contact *F! It is widely used because of its good workability. Conventional nickel has a weight ratio of 10'Is~3
01 is often used. The reason for this is that the overall evaluation of contact resistance, welding resistance, and abrasion resistance required for electrical contacts is excellent. 1 (l) or less, it was not used in the past because the contact performance was almost the same as that of steel, but as mechanical parts have recently become smaller, the contact force, separation force, etc. have become smaller and the contact resistance has increased. , the mechanism becomes unstable, resulting in a final KFi conduction failure and a problem in which the mechanical parts do not work properly.The cause of this problem is that Fi and nickel hardly dissolve in solid solution, so silver powder and nickel powder must be mixed, compressed, and extruded. Therefore, the steel powder and nickel powder are mechanically mixed and bonded, and this material [when used as an electrical contact, is resistant to gel heat and arc heat during opening and closing]. This is because the cynicles aggregate and the nickel oxidizes to become nickel oxide.However, in the past, this problem could be solved by improving the mechanical parts, such as increasing the contact force and separation force tube, but as mentioned at the beginning. As mechanical parts became more common, it became impossible to respond.

In view of the above-mentioned circumstances, the present invention was made with the aim of stabilizing the contact resistance of complex nickel-based electrical contact materials. Furthermore, the present invention provides a stable electrical contact resistance tube without impairing the advantages of nickel-based electrical contact materials, such as good workability, good welding resistance, and abrasion resistance. The purpose of the present invention is to provide a skin layer material.

The present invention is an electrical contact material characterized by comprising, in weight ratio, 5 to 10 G of nickel and at least one of tungsten, chromium, or molybdenum, and a total of 0.4 to 2 G of the balance.

Tungsten, chromium, and molybdenum are all very hard and have poor compatibility with silver. Therefore, the present invention attempts to uniformly disperse at least 111 of these elements into a steel-nickel alloy material to improve the contact performance in preventing nickel agglomeration.

Here, the reason why the nickel zero weight is limited to 5 to 1011 is because if it is less than 5, the welding resistance and wear resistance will deteriorate, and if it is more than 10, the agglomeration and oxidation of nickel will become severe. Also, tungsten, chromium or molybdenum is 0
．． Each element in the range of 4-2- acts equally on the @-nickel alloy and stabilizes contact resistance without impairing welding resistance or abrasion resistance. However, if it is less than 0.4, electric Wfi
It is not possible to prevent the agglomeration of nickel due to Mule heat and arc heat when the skin is opened and closed, and if it exceeds 21 Gt, workability will deteriorate and wear and tear during opening and closing will be significant, so the total amount of these elements!
0.4-2 Unfortunately limited.

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

Example 1 Silver powder, nickel powder, and tungsten powder each having a particle size of several tens of nanometers were mixed at a weight ratio of 90:8:20. After repeating this mixed powder wood tube compression and sintering, hot extrusion,
Cold wire drawing. Then, by processing this wire rod header, a movable contact with a head diameter of 2.8 w / and a head diameter of &5 ym
Fixed W of /? Point tl! Just in case.

Example 2 Silver powder, nickel powder, tungsten powder, and molybdenum powder with a particle size of about 100 microns were mixed in a weight ratio of 94:5:0.5:040.
mixed in proportion. A movable contact and a fixed mar were obtained in the same manner as in Example 1 for this mixed powder woodwind.

Example 3 Silver powder, nickel powder, and chromium powder each having a grain size of 100 μm were mixed in a weight ratio of 89.6:10:0.4. A movable contact and a fixed contact were obtained in the same manner as in Example 1 for this mixed powder wood pipe.

Conventional Example 1 Silver powder and nickel powder with a particle size of several tens of microns were mixed in a weight ratio of 90:
They were mixed at a ratio of 100. This mixed powder is compressed and sintered into a tube.
After repacking, hot extrusion and cold wire drawing were performed. Then, this wire was subjected to header processing to obtain a movable contact with a head diameter of 2.8 w/w and a fixed contact with a head diameter of 3.5 wt/.

Conventional Example 2 Silver powder and nickel powder with a particle size of about 100 microns are mixed in a ratio of 70:30.
mixed in the ratio of Using this mixed powder, a movable contact and a fixing member were obtained in the same manner as in Conventional Example 1.

Therefore, 69 pairs of rivet-type electrical contacts of Examples 1 to 3 and Conventional Examples 1 and 2 were subjected to opening/closing tests under the following test conditions, and the welding resistance and contact resistance were investigated, and the results are shown in the table below. Obtained.

Test conditions Voltage AClooV 50Hz Current 5A Switching frequency 20 times/min Load Resistance switching frequency Until welding occurs As is clear from the results in the above table, the electrical contacts made with the electrical connection material of the present invention are as good as conventional electrical contacts. It can be seen that the contact resistance is more stable than that of contacts, and the welding resistance is as excellent as that of the conventional example.

From the above explanation, it is clear that the electric power of the present invention
Tang material can be said to be an epoch-making invention with superior stability in contact resistance compared to conventional electrical connection materials.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] The total weight ratio of 5 to 10 nickel and at least one of tungsten, chromium, or molybdenum is 0.4 to 2.
The electrical contact material consists of two parts;