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

A switch contact and tungsten alloy technology, applied in the field of arc ablation resistant tungsten alloy switch contact and its preparation, can solve the problems of low manufacturing cost, short life, large on-current and the like

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] The purpose of the first invention: to overcome the defects of high cost and low arc ablation resistance of traditional gold-plated, silver-based or silver-plated switch contacts, or to overcome the relatively high cost of copper-based, tin-based, nickel-based or stainless steel contacts. Low, but poor arc ablation resistance and short life, provide a tungsten alloy switch contact with low manufacturing cost, large conduction current, and arc ablation resistance

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The following are examples of making contacts with tungsten alloy coatings.

[0063] Plating solution composition: sodium tungstate 100g / L, sodium hypophosphite 35g / L, sodium citrate 50g / L, potassium sodium tartrate 30g / L, ammonium sulfate 30g / L, sodium pyrophosphate 24g / L, potassium iodate 40mg / L, sodium thiosulfate 32mg / L, sodium lauryl sulfate 1g / L. Ammonia water is added in an appropriate amount to maintain the pH value of the plating solution between 8.5 and 9.5.

[0064] Routing:

[0065] The metal sheet layer 2 is made of a 0.1 mm thick zinc white copper sheet with a HV hardness of 120 to 180 and a copper content of about 55% as the metal base material. The reason for choosing zinc white copper is that zinc white copper has excellent comprehensive mechanical properties, excellent corrosion resistance, good cold and hot processing formability, and is suitable for manufacturing various elastic components. The smooth zinc-nickel-nickel copper sheet is mechanical...

Embodiment 2

[0071] The following are examples of the preparation of contacts containing tungsten alloy coatings.

[0072] Plating solution composition: sodium tungstate 90g / L, nickel sulfate 10g / L, basic nickel carbonate 16g / L, sodium hypophosphite 25g / L, sodium citrate 50g / L, potassium sodium tartrate 30g / L, ammonium sulfate 30g / L, sodium pyrophosphate 24g / L, potassium iodate 40mg / L, sodium thiosulfate 32mg / L, sodium lauryl sulfate 1g / L, sodium o-sulfonylimide 20g / L. Ammonia water is added in an appropriate amount to maintain the pH value of the plating solution between 8.5 and 9.5.

[0073] Routing:

[0074] Such as figure 2 As shown, a 0.075mm thick flat stainless steel sheet (model 304) is subjected to alkaline degreasing and anodic degreasing, and then cleaned with tap water, then distilled water and alcohol, and one side of it is covered with a rubber-metal adhesive. Mixture (U.S. Rohm and Haas Megum 3270) for primer treatment, and then, the treated side of the primer, and a me...

Embodiment 3

[0079] Using 400-mesh stainless steel plain mesh (stainless steel type 304) to replace the stainless steel sheet in Example 2, using the process and chemical plating solution in Implementation 2, the contacts produced also have lower contact resistance and better contact resistance. Arc ablation resistance performance.

[0080] 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, the contact with the tungsten alloy coating 3 needs to be prepared by using a stainless steel mesh with an enlarged mesh.

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Abstract

The invention discloses a switch contact capable of resisting electric arc erosion and a preparation method thereof. The switch contact capable of resisting the electric arc erosion is of layer structure composed of three layers, wherein the first layer is a hydrophobic rubber layer, the second layer is a sheet metal layer, and the third layer is a chemical deposit layer of tungsten alloy. A plating solution used in chemical deposit of the switch contact capable of resisting the electric arc erosion contains 25-125g / L of a soluble tungsten compound, 0-60g / L of a soluble compound of transition metal of iron, nickel, cobalt, copper or manganese, and 0-30g / L of a soluble compound of tin, antimony, lead or bismuth. When chemical plating is performed on a lamellar compound body of the hydrophobic rubber layer and the sheet metal layer by using the plating solution, a tungsten alloy clad layer is selectively deposited on the surface of the sheet metal layer, and primarily, no chemical deposit of the tungsten alloy is generated on the surface of the hydrophobic rubber layer. The switch contact capable of resisting the electric arc erosion, which is prepared by using the preparation method, has good metal coloring, is low in contact resistance, high in performance of resisting switch electric arc erosion, long in use life, and suitably bonded and shaped with rubber through heat vulcanization.

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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IPC IPC(8): H01H1/04H01H11/04C23C18/48
CPCC23C18/1844C25D7/00C23C18/1806C23C18/32C23C18/50C23C18/52C23C18/1692H01H1/021C23C18/48H01H2011/046C25D7/005C23C18/1633C25D3/12C25D3/562H01H11/041H01H11/042H01H11/06H01H2011/067
Inventor 韩辉升王振兴丁阳张红梅
Owner NANTONG MEMTECH TECH
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