Switch contact containing molybdenum alloy coating and preparation method thereof

A switch contact, molybdenum alloy technology, applied in the direction of contacts, electrical switches, electrical components, etc., can solve problems such as low resistivity

Active Publication Date: 2015-11-18
NANTONG MEMTECH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although tungsten has a higher melting point, lower vapor pressure and evaporation rate, among pure metals, the conductivity of molybdenum ranks behind silver, copper, gold, and aluminum, and is higher than that of tungsten, zinc, nickel, cadmium, palladium, and iron. , platinum, tin, lead, antimony, titanium, and mercury have a small resistivity

Method used

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  • Switch contact containing molybdenum alloy coating and preparation method thereof
  • Switch contact containing molybdenum alloy coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Plating solution composition: sodium molybdate dihydrate 50g / L, nickel sulfate hexahydrate 20g / L, sodium hypophosphite monohydrate 40g / L, sodium acetate 25g / L, sodium citrate 50g / L, sodium fluoride 2g / L , ammonium sulfate 20g / L, thiourea 0.2g / L, potassium sodium tartrate 30g / L, sodium pyrophosphate 24g / L, potassium iodate 40mg / L, sodium lauryl sulfate 0.5g / L. Ammonia water is added in an appropriate amount to maintain the pH value of the plating solution between 8.5 and 9.5.

[0059] Routing:

[0060] Such as figure 1 As shown, one side of a 0.1mm thick flat stainless steel sheet (stainless steel type 304) is mechanically roughened (sand blasted or sanded), then alkaline degreased, cleaned with deionized water, and air-dried , The side of the stainless steel that has been sandblasted and roughened is primed with a rubber-metal adhesive ChemlokCH238, and then the side that has been primed is treated with a compound of ethylene-propylene-diene rubber (EPDM) Thermal vul...

Embodiment 2

[0065] Plating solution composition: sodium molybdate dihydrate 60g / L, nickel sulfate hexahydrate 10g / L, basic nickel carbonate tetrahydrate 10 / L, hydrazine 100 / L, sodium pyrophosphate 15g / L, potassium sodium tartrate 20g / L, Sodium lauryl sulfate 0.5g / L. Ammonia water is added in an appropriate amount to maintain the pH value of the plating solution between 8.5 and 9.5.

[0066] Routing

[0067] Etch one side of a 0.075mm thick flat stainless steel sheet (type 304) with an acidified ferric chloride etching solution to etch out evenly distributed small holes with a diameter of 0.25mm and a depth of 0.03-0.04mm, and the spacing between the small holes is 0.25mm. mm. Then the stainless steel sheet is subjected to alkaline degreasing, cleaned with deionized water, air-dried, and the flat side of the stainless steel is primed with a water-based rubber-metal adhesive Megum? W2535 produced by Rohm and Haas Company of the United States. Coating treatment, and then thermally vulcani...

Embodiment 3

[0071] 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.

[0072] 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 comprising a molybdenum alloy coating and a production method thereof. The switch contact comprises three layers of structures; the first layer is a hydrophobic rubber layer; the second layer is a sheet metal layer; the third layer is a molybdenum alloy chemical sediment layer; a plating solution adopted in the chemical sediment layer comprises 20 to 125 grams per liter of soluble molybdenum compounds; the molybdenum alloy coating is selectively deposited on the metal surface when the chemical deposition is performed on layered composites of the hydrophobic rubber layer and the sheet metal layer through the plating solution. According to the switch contact comprising the molybdenum alloy coating and the production method thereof, the switch contact is good in metal color, low in contact resistance, high in switching arc erosion resistance, long in service life and suitable for hot vulcanization bonding and forming with rubber.

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 Patents(China)
IPC IPC(8): H01H1/021H01H11/04C23C18/48
CPCC23C18/48H01H1/021H01H11/04
Inventor 韩辉升王振兴丁阳张红梅管建华邬国强
Owner NANTONG MEMTECH TECH
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