JPS58207343A - Electrical contact material for sealing - Google Patents

Abstract

PURPOSE:To obtain a composite electrical contact material for sealing consisting of a prescribed percentage of chromium nitride and the balance copper, superior to a conventional composite electrical contact material contg. copper-nitride in contact performance, and having especially stable low contact resistance. CONSTITUTION:This composite electrical contact material for sealing contains 1-20wt% chromium nitride in copper. Copper powder is mixed with chromium nitride powder in a V-shaped mixer for a prescribed time. The powdered mixture is filled into a crucible, and it is repeatedly sintered and compressed until a prescribed density is provided. The resulting material is hot extruded, formed into a wire rod with a drawer, and worked with a header to obtain a rivet type contact or the like. This composite electrical contact material is not at all inferior to a conventional electrical contact material contg. copper-nitride or the like in welding and consumption resistances, and it has superior contact resistance characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electrical contact materials for the encapsulation of copper nitride threads. Conventionally, electrical contact materials for encapsulation have been used.
The electrical contact material made of noble metals such as silver cadmium oxide 12% with paranoeum thread alloy has excellent contact in the small to medium current range)j (characteristics of F4 material). However, due to the recent miniaturization of electrical equipment and 4F equipment, the contact characteristics favored by salt air contact materials have been severely affected. , conventional silver cadmium oxide yarn composite 'It'
JA contact materials have poor welding resistance and are no longer durable for use. In these four cases, the iii for encapsulation has excellent welding resistance.
Air contact contact materials are desired.

・)i v4 Providing a contact material at low cost by suppressing the use of gold 14 No attempt has been made to use it.

When copper is used as a contact material, corrosion resistance of copper becomes a problem, but this problem is solved by using copper in a vacuum or neutral gas, and it is no more expensive than using precious metals as the mother alloy. It has comparable characteristics. In particular, nitrides have a high melting point, and if a material with a commercial melting point such as titanium nitride or silconinium nitride is used as a dispersion reinforcing material for copper, the amount of wear is small, and C also reduces the excellent properties of welding strength. be. However, with materials such as these whose melting point is low and whose composition changes little due to melting, evaporation, etc., as the contact opens and closes (surface layer It has an axial orientation that results in unstable dam contact resistance.

The present invention was made in view of the above circumstances, and has superior contact performance than conventional copper-nitride composite electrical contact materials.
In particular, it is an object of the present invention to provide a composite electrical contact material that exhibits stable and low contact resistance.

The electrical contact material for encapsulation of the present invention contains 1 to 2 chromium nitride in steel.
The reason for adding chromium nitride to the steel is that chromium nitride has an unstable property that decomposes at 1500℃, which prevents the formation of nitride agglomeration bands on the contact surface and increases the contact resistance. This is because it has the function of stabilizing.

In the electrical contact material of the present invention, chromium nitride is added to the steel in an amount of 1 to 20% by weight because if it is less than 1% by weight, the copper base will not be sufficiently strengthened, so the wear resistance or welding resistance can be improved. Good results cannot be obtained regarding properties. 20 again
If the composition exceeds % by weight, processing becomes difficult and the electrical conductivity of the material becomes low (so that good results cannot be obtained.For the above reasons, the composition described in the claims is limited.

Furthermore, when these copper-nitride materials are used in a nitrogen atmosphere, they exhibit even better anti-welding properties.

〔Example〕

(3) After mixing W uniform grained Pi 4μ copper powder and chromium nitride in a V-type mixer for 3 hours, the powder was filled into a crucible and sintered and compressed repeatedly until a predetermined density was reached.The material was then hot heated. Extruded. This was made into a wire rod using a wire drawing machine, and then added to a wire rod using a wire drawing machine. A rivet type contact with 8ψ mist, leg & 1.6ms was obtained.

[Conventional Example 1] + Copper powder with a uniform particle size of 4μ and nitrided J tan were mixed for 3 hours in a V-type mixer, and then the powder was filled into a crucible at °C and sintering and compression was repeated until a predetermined density was reached. After... Added by the ivy machine 1. Head 1 having the composition of the top surface 4ψw-IIJ
A dragon glue/throat type contact with a leg diameter of 2.8ψl and a leg length of 1.6 was obtained.

[Conventional Example 2] After casting a silver 1mm alloy, it is drawn out and wire drawn with a fine clay, and this is made into a header using a machine with a head diameter of 4φ, head i1”, and l@
m Leg diameter 2.8φ1m, 1.6m rib on the leg, 1
After molding into a shape, internal oxidation was carried out at 800° C. and 1 pressure of 5′ air to give a silver oxidizing power of 1 and 12% to 9%.

(4) However, the above embodiment and conventional example 1. The electrical contacts of No. 2 were subjected to an opening/closing test under the following test conditions, and the number of openings and closings until welding occurred was measured, as well as contact resistance 5 consumption. Results were obtained as shown in the right column of the table below.

Test conditions Voltage A, C; 1'OOV 50Hz Current Closing current 40A, steady current 10A Opening/closing frequency
20 times/min load Resistance switching times Atmosphere until welding occurs Nitrogen atmosphere (5) As is clear from the values in the right column of the table above, the electrical contacts made using the electrical contact material of the example were as follows: Conventional Example 1.2 It can be seen that it has excellent wear resistance and welding resistance compared to electrical contact materials, and it also has stable and low contact resistance.

As detailed above, composite electrical connection +j according to the present invention, 44.
Material 4 has superior welding resistance and abrasion resistance compared to conventional electrical contact materials of silver-cadmium oxide and copper i-tanium nitride threads, and has excellent contact resistance properties of 1° [Zunode] Excellent for miniaturizing electronic devices.) It is an innovative electrical contact material for encapsulation that has contact performance that can withstand harsh usage conditions.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. (6)

Claims (1)

[Claims] ...Electric contact material for enclosing Aihi C chromium nitride with 1 to 20% A and the balance less than copper.