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Composite electrical contact material and preparation method thereof

A technology of electrical contact materials and production methods, which is applied in the direction of contact materials, contacts, circuits, etc., can solve the problems of inability to balance mechanical and electrical properties, limit the application of composite contacts in large quantities, and require high processing properties of silver alloys. The effects of enhanced physical properties, improved bonding strength, and reduced cold deformation

Active Publication Date: 2011-12-28
哈尔滨东大高新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the past, the composite technology mostly used cold and hot rolling methods, explosion methods, etc. to combine silver alloy sheets with copper or copper alloy sheets. In order to be unable to compound, this makes the production of composite electrical contact materials have great limitations, limiting the large number of applications of composite contacts
In addition, the uniformity of the composition of the silver alloy that can be composited also affects its function to a certain extent, and it cannot take into account both mechanical and electrical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Silver-diamond / copper-diamond composite electrical contact material (single additive)

[0025] (1) 98.7kg of electrolytic copper powder and 1.3kg of diamond powder are mixed, ingot-made, sintered, hot-extruded, cold-rolled and other processes are made into a plate with a thickness of 1.0mm, and one side is selected as the composite surface.

[0026] (2) Mix 9.95kg of silver powder with an average particle size of 1-1.5μm and 0.05kg of nickel powder with the same particle size, add 1L of distilled water, stir and disperse in an ultrasonic disperser for 5 minutes to make a silver alloy slurry.

[0027] (3) Brush the silver alloy paste evenly on the composite surface of the copper-based substrate after the surface cleaning treatment. The brushing thickness is 10-15 μm, and dry at 105 ° C. The function of drying is to remove water and solidify the silver. Nickel alloy paste.

[0028] (4) Place the dried plates on a special shelf, put them into a sintering furnace for prima...

Embodiment 2

[0035] Production of gradient silver-nickel / stainless steel composite electrical contact material (gradient material)

[0036] (1) The stainless steel plate is rolled into a plate with a thickness of 1.0mm, and one side is selected as the composite surface.

[0037] (2) Mix 1.8kg, 1.7kg, 1.6kg, 1.5kg, 1.4kg silver powder with an average particle size of 1-1.5μm with 0.2kg, 0.3kg, 0.4kg, 0.5kg, 0.6kg nickel powder of the same particle size Evenly, make 5 parts of silver-nickel alloy powders with nickel content of 10%, 15%, 20%, 25%, and 30%, respectively, add 200mL absolute ethanol to stir and disperse in an ultrasonic disperser for 5 minutes, and make 5 parts parts of silver-nickel alloy paste.

[0038] (3) Brush the silver-nickel alloy slurry with a nickel content of 10% evenly on the surface-cleaned stainless steel composite surface with a thickness of 10-15 μm, and dry at 105° C.

[0039] (4) Place the dried plates on a special shelf, put them into a sintering furnace for...

Embodiment 3

[0046] Production of silver-nickel-graphite-lanthanum / copper-diamond-silver composite electrical contact materials (composite additives)

[0047] (1) Mix 97.7kg of electrolytic copper powder with 1.3kg of diamond powder and 1kg of silver powder through processes such as ingot making, sintering, hot extrusion, and cold rolling to make a plate with a thickness of 1.6mm, and select one side as the composite surface .

[0048] (2) Mix 8.2 kg of silver powder with an average particle size of 1 to 1.5 μm with 1.2 kg of nickel powder, 0.4 kg of graphite powder, and 0.2 kg of lanthanum powder with the same particle size, add 1 L of distilled water, stir and disperse in an ultrasonic disperser for 5 Minutes to make silver alloy paste.

[0049] (3) Brush the silver alloy paste evenly on the composite surface of the copper-based substrate after the surface cleaning treatment. The brushing thickness is 10-15 μm, and dry at 105 ° C. The function of drying is to remove water and solidify t...

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Abstract

The invention relates to a composite electric contact material and a preparation method thereof. The method comprises the following steps: 1, uniformly mixing silver powder and additive powder, blending the mixed powder into slurry with absolute ethyl alcohol and dispersing; 2, taking copper base material or stainless steel as a base material, coating the mixed powder slurry on the base material,drying, and then putting the base material in a protective atmosphere to carry out primary sintering and heat preservation; 3, coating the mixed powder slurry on the base material after cooling, and carrying out re-sintering and heat preservation; 4, repeating the process of step 3, and then cold or hot processing; and 5, putting the cold or hot processed material in an inert gas protective atmosphere to carry out final sintering and heat preservation. The additive is one of or any combination of nickel, rare earth, rare earth oxide, cadmium oxide, zinc oxide, tin oxide, indium oxide, tungsten carbide, boron carbide, diamond and graphite. According to the invention, the combination strength of silver alloy and the copper base material or stainless steel is improved, and the electric conductivity is enhanced. The defect that the silver alloy can not be compounded in a conventional method due to brittleness is overcome.

Description

technical field [0001] The application of the present invention relates to an electrical contact material and a preparation method thereof, specifically a production method of a silver alloy-copper base material or a silver alloy-stainless steel composite electrical contact material. Background technique [0002] At present, the contacts used in contactors and circuit breakers are mainly silver-based alloys, which consume a large amount of silver every year. In order to save the amount of silver used, silver-copper composite electrical contact materials came into being, saving a lot of silver. However, in the past, the composite technology mostly used cold and hot rolling methods, explosion methods, etc. to combine silver alloy sheets with copper or copper alloy sheets. This method has high requirements on the workability of silver alloys, and the brittleness of many silver alloy materials determines In order to be unable to perform composite, this makes the production of c...

Claims

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Application Information

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IPC IPC(8): B22F7/04C22C1/05C22C5/06H01H1/04H01H1/023
Inventor 倪树春王英杰何肖冰刘新志杨丛涛
Owner 哈尔滨东大高新材料股份有限公司
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