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Switch contact capable of resisting electric arc erosion and preparation method thereof

A switch contact, arc-resistant technology, applied in electrical switches, contacts, circuits, etc., can solve the problems of high cost, poor arc resistance, and low arc resistance.

Active Publication Date: 2014-10-15
NANTONG MEMTECH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Purpose of the first invention: To overcome the defects of high cost and low arc resistance of traditional gold-plated or silver-plated switch contacts, or to overcome the low cost of copper-based, tin-based, nickel-based or stainless steel contacts but arc resistance Poor disadvantages, provide a switch contact with low manufacturing cost, good electrical conduction performance, and arc ablation resistance

Method used

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  • Switch contact capable of resisting electric arc erosion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Plating solution composition:

[0061] (1). Nickel plating bath: nickel sulfate hexahydrate 20g / L, sodium hypophosphite 23g / L, succinic acid 8g / L, sodium acetate 15 g / L, citric acid 8g / L, sodium lactate 16g / L, saccharin Sodium 2g / L, thiourea 0.0005g / L, potassium sulfate 0.001g / L, ethylene glycol 0.002g / L. The pH is controlled at 4.5-5.3, and the temperature is controlled at 85-90°C.

[0062] (2). Tungsten alloy plating solution: sodium tungstate dihydrate 75g / L, nickel sulfate hexahydrate 25g / L, sodium hypophosphite monohydrate 80g / L, sodium acetate 20g / L, sodium citrate 30g / L, saccharin Sodium 20 g / L, ammonium sulfate 15 g / L, thiourea 0.2 g / L, sodium lauryl sulfate 0.5 g / L, potassium iodate 0.1 g / L, ammonia water in proper amount. The pH is controlled at 8.0-8.5, and the temperature is controlled at about 75°C.

[0063] (3). Low tungsten alloy plating solution: sodium tungstate dihydrate 25 / L, nickel sulfate hexahydrate 70g / L, basic nickel carbonate tetrahydrate 10g...

Embodiment 2

[0071] In this embodiment, the plating solution of Embodiment 1 is still used, and a 0.075 mm thick stainless steel sheet made of SUS304 is still used as the metal sheet in the contact.

[0072] Degrease the flat stainless steel sheet with an alkaline cleaner, wash it with tap water, soak it in 5% dilute hydrochloric acid for 30 seconds, and wash it with deionized water. Air dry.

[0073] Put the stainless steel sheet into the above-mentioned nickel plating bath, stir, and allow the nickel alloy to deposit on both sides of the stainless steel sheet, take it out after 60 minutes, clean it with deionized water, and dry it. Then place methylvinyl silicone rubber containing 1% vinyl tritertbutylperoxysilane (VTPS) and 0.5% dicumyl peroxide (DCP) and a stainless steel sheet coated with nickel alloy on the surface of the mold cavity to coat In a mold with Teflon, one side of the stainless steel sheet and silicone rubber are thermally vulcanized and bonded at 175°C for 8 minutes to ...

Embodiment 3

[0077] Using 400-mesh stainless steel plain mesh (stainless steel type 304) to replace the stainless steel sheet in Example 1, using the process and chemical plating solution in Implementation 1, the contacts produced also have lower contact resistance and better contact resistance. Arc ablation resistance performance.

[0078] The 400-mesh stainless steel mesh has very small mesh, and when it is molded with silicone rubber, the silicone rubber will not penetrate the mesh of the stainless steel mesh. If you choose a stainless steel mesh with a small mesh number, such as a stainless steel mesh below 80 mesh, there will be a technical problem that silicone rubber penetrates the stainless steel mesh during molding. Therefore, it is necessary to use a larger mesh stainless steel mesh to prepare the coated switch contacts.

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Abstract

The invention discloses a switch contact capable of resisting electric arc erosion. The switch contact capable of resisting the electric arc erosion is of layer structure composed of five layers, wherein the first layer is a hydrophobicity rubber layer, the second layer is a sheet metal layer, the third layer is a clad layer of transition metal of iron, cobalt and nickel or copper alloy, the fifth layer is a tungsten alloy clad layer, the forth layer of a low tungsten alloy clad layer can be arranged between the third layer and the fifth layer, the clad layers are all formed through chemical plating, the fifth layer of the tungsten alloy clad layer contains 50-99% of tungsten in weight percentage, and the forth layer of the low tungsten alloy clad layer contains 5-75% of metal tungsten in weight percentage. The switch contact capable of resisting the electric arc erosion has good performance of resisting the electric arc erosion, is low in cost, has good metal coloring, and is suitably composited with rubber, and therefore a rubber key which contains the switch contact capable of resisting the electric arc erosion is produced.

Description

technical field [0001] The invention specifically relates to a switch in an electric or electronic product or a component (that is, an electrical contact or a contact point) through which current can pass through contact between two conductors in a circuit and a preparation method thereof. Background technique [0002] Electric contacts or contacts are important components that allow current to pass through contact between two conductors in a switch or circuit. They undertake the functions of connecting, carrying and breaking normal currents and fault currents. Their quality and service life are directly related to It determines the quality and service life of the entire switch or circuit. Electrical contacts or contacts are mainly used in relays, contactors, air switches, current limiting switches, motor protectors, micro switches, instruments, computer keyboards, handhelds, household appliances, automotive appliances (window switches, rearview mirrors) switch, light switc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/021H01H11/04C23C18/48
CPCH01H1/021
Inventor 韩辉升王振兴丁阳张红梅管建华
Owner NANTONG MEMTECH TECH