JPS6036637A - Electrical contact material - Google Patents

Abstract

PURPOSE:To obtain an inexpensive electrical contact material having superior welding resistance, satisfactory contact resistance and high consumption resistance by sintering a powdery mixture having a specified composition consisting of Ag, Ni and Zn. CONSTITUTION:A powdery mixture consisting of 10-20wt% Ni, 2.5-15wt% Zn and the balance Ag is sintered to obtain an electrical contact material having favorable properties while reducing the amount of expensive Ag used. Ni improves the consumption resistance, yet in case of <10% Ni, the purpose of the addition is not attained, and >20% Ni increases the contact resistance. Zn improves the welding resistance, but in case of <2.5wt% Zn, the purpose of the addition is not attained, and >15% Zn increases the contact resistance and deteriorates the workability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electrical contact material made of an AQNi-Zn sintered body.

[Prior Art and Disadvantages] Conventionally, AU-cdo type electrical contact materials have been used in medium load installations, but this material has undergone various improvements from both the compositional and manufacturing viewpoints. It is thought that the welding resistance and abrasion resistance required for hm-1 point have reached their limits for this system. However, harmful c
Because it is made from Cd, it contains Cd during its manufacturing process and use.
It has the disadvantage of high cost due to its high content. Therefore, Aa-
Ni-based materials have been proposed. However, AO-N+
The AQ-ado based material is considered to have the same wear resistance as the AQ-ado based material, but has the problem of being inferior in welding resistance.

[Object of the Invention] This invention was made in view of the above circumstances, and when used as an electrical contact material, the contact resistance and amount of wear are equivalent to the above-mentioned Hero Ni-based material, and it has excellent melting resistance @ properties. The object of the present invention is to provide an electrical contact material that is superior to the AQ-Ni series, equivalent to the Ag-ado series, and in which the amount of expensive AQ used is reduced.

[Structure and effects of the invention] In order to achieve the above object, the present invention is directed to AO.

A sintered material obtained by sintering a mixed powder of N1 and Zn is used as an electrical contact material, and the composition of each component in that case is Ni10-20.
wt%, Zn 2.5-15wt%, balance Ag 2
− It is something that The reason for determining the components in this way is as follows.

Ni: Added to improve wear resistance, 10
If it is less than 20 wt%, the purpose of addition will not be achieved, and if it is more than 20 wt%, the contact resistance will increase.

Zn: Added to improve welding resistance, 2
．． If it is less than 5wt%, the purpose of addition cannot be achieved, and 15wt%
Below-F, contact resistance increases and workability deteriorates.

The electrical contact material of the present invention shows a significant improvement in welding resistance compared to AQ-N1 based materials. On the other hand, the contact resistance is equivalent to that of the Ag-Ni type, and is slightly inferior to that of the ACJ-cdo type, but the difference is such that it does not cause much of a problem in use. Also, the wear characteristics are AQ-CCJO, AQ-N
Although it is slightly inferior to the i-series, the difference is such that it does not pose much of a problem in actual use. As described above, although the electrical contact material according to the present invention has almost the same characteristics as the AG-cdo-based material, the amount of AQ used is reduced compared to that of the AG-cdo-based material, and it can be used as an alternative contact material. Why is it suitable for 9T?

[Description of Examples] Δ070wt%, Ni 22.5wt%, Zn7.5
Wt% of each powder was mixed using a ball mill, and this mixed powder was heated to 20φ×30j2 at a pressure of 4 ton/cm'.
The obtained molded body was heated and sintered at 700 to 800° C. for 1 to 2 hours in an inert 14 gas atmosphere. While heating this sintered body to 700 to 800°C, an extruder was used to create a 6M diameter sintered body. The contact was molded into a single piece, roughly drawn, and processed into a header, and the contact was assembled into a relay and used as a sample.

Comparison amount 1 Using the AQ and CDO powders used in the examples as raw materials, 1@@ sintered body made of Ao-12% Cdo with the same 1 M as in the examples was made into a contact, and this was incorporated into a relay. .

Comparison amount 2 Using the Ao and Ni powders used in the examples as raw materials, these were mixed in a weight ratio of 70% Aa and 30% Ni, and an AGN + system sintered body was obtained in the same manner as in the examples, and a contact point was obtained. None, this is built into the relay.

Regarding the sample obtained in the above example and comparative amounts 1 and 2,
Contact resistance, wear amount, and melting properties were measured under the following conditions. Note that the amount of wear represents the amount of wear of the contacts when the contacts are opened and closed 350,000 times.

(Large down arrow white) 5- Test condition samples Relays (2C) 5 each Voltage 100V Current 7A Load R load contact force 15g Opening/closing frequency 20 times/min From the table above, the test sample was compared to comparison quantity 2. Significant improvement in welding resistance was observed, and even compared to Comparative Amount 1, the performance was equivalent or better. Furthermore, although the contact resistance and the amount of wear are slightly inferior to the comparative quantities, it can be seen that the differences are of a degree that does not pose much of a problem in actual use.

east Patent applicant: Tateishi Denki Co., Ltd. -6-

Claims (1)

[Claims] An electrical contact material C made by sintering a mixed powder of AQ, Ni, and Zn, wherein the Ni content is 10 to 20 WtX, Zn is 2.5 to 15 wt%, and the balance is AQ.