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Switch contact with refractory metal alloy coating layer and preparation method thereof

A refractory metal and alloy coating technology, applied in metal material coating process, contacts, electrical switches, etc., can solve the problems of poor arc resistance, not too high arc resistance, and high cost of switch contacts

Active Publication Date: 2014-10-22
NANTONG MEMTECH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the first invention: to overcome the defects of high cost and low arc resistance of traditional gold-plated, silver-based or silver-plated switch contacts, or to overcome the low cost of copper-based, nickel-based or stainless steel contacts but arc resistance Poor disadvantages, provide a switch contact with refractory metal alloy coating with low manufacturing cost, good conduction performance, and arc ablation resistance

Method used

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  • Switch contact with refractory metal alloy coating layer and preparation method thereof
  • Switch contact with refractory metal alloy coating layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Preparation of a switch contact with refractory metal alloy coating:

[0061] Its bath consists of:

[0062]

[0063] Preparation of plating solution: first dissolve the above-mentioned various compounds in water or heat to dissolve in water, and then mix them together in proportion. Adjust the pH value to 9.0 with ammonia water, and dilute with water to the specified volume.

[0064] Routing:

[0065] like figure 1 , 2 As shown, a zinc white copper sheet with a thickness of 0.1 mm, a HV hardness of 120 to 180, and a copper content of about 55% is used as the metal substrate as the metal sheet layer 2 . 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 rolled into a fine corrugated sheet by mechanical method, the pe...

Embodiment 2

[0071] Preparation of a switch contact with refractory metal alloy coating:

[0072] Plating solution composition:

[0073]

[0074] Plating solution preparation: first dissolve the above-mentioned compounds in water, and heat to speed up the dissolution process. Among them, titanium trichloride can be dissolved in water or 10% hydrochloric acid solution. The prepared titanium trichloride solution cannot be placed for a long time to avoid precipitation. Except titanium trichloride solution and ammonia water, mix all the above solutions in proportion to form a mixed solution; add ferric chloride solution in proportion to the mixed solution, and stir evenly; adjust the pH value to 9.0 with ammonia water, and add water to dilute to the specified volume.

[0075] Routing:

[0076] The 0.075mm thick flat stainless steel sheet (type 304) is subjected to alkaline degreasing and anodic degreasing, and cleaned, used as the metal sheet layer 2, and one side of it is covered with ...

Embodiment 3

[0081] 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.

[0082] 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 with a refractory metal alloy coating layer and a preparation method thereof. A contact part is in a three-layer structure, the first layer is a hydrophobic rubber layer, the second layer is a sheet metal layer, and the third layer is a chemically deposited layer of a refractory metal alloy. A plating solution used for chemical deposition contains a soluble tungsten compound, a soluble molybdenum compound and the like. When a layered complex of the hydrophobic rubber layer and the sheet metal layer performs chemical deposition by the aid of the plating solution, the refractory metal alloy coating layer is selectively deposited on metal surfaces. The prepared switch contact has the advantages that the metal luster and color is good, the contact resistance and the costs are low, the resistance to switching arc erosion is high, the service life is long, and the switch contact is suitable for heat 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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IPC IPC(8): H01H1/021H01H11/04C23C18/48
CPCC23C18/48H01H1/021H01H11/04
Inventor 韩辉升王振兴丁阳张红梅顾建祥
Owner NANTONG MEMTECH TECH
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