A kind of silver-nickel composite material and preparation method thereof

A composite material, silver-nickel technology, applied in the field of silver-based electrical contact materials, can solve the problems of poor anti-fusion welding performance, complex preparation process, difficult adjustment, etc., and achieves the effect of low cost, simple process and improved quality fraction

Active Publication Date: 2021-11-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

[0008] The technologies of the above two silver-nickel composite materials are to improve the material performance through the uniform distribution and plastic deformation of the nickel phase respectively; however, the inventors of the present invention have found that the above-mentioned technologies have at least the following technical problems: (1) the preparation process is relatively complicated; (2) The nickel content in the composite material is low and it is not easy to adjust. At the same time, there will be problems such as reduced strength and poor anti-welding performance.

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  • A kind of silver-nickel composite material and preparation method thereof
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  • A kind of silver-nickel composite material and preparation method thereof

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preparation example Construction

[0040]What needs to be explained here is that the preparation method of the silver-nickel composite material proposed by the present invention mainly uses two kinds of raw materials: the first kind is nickel powder or silver-nickel mixed powder whose particle size range is 0.2-200 μm; the second kind It is a silver block or a silver alloy block (a silver block refers to a pure silver block); the corresponding preparation steps mainly include two steps of molding and high temperature infiltration. Wherein, the specific preparation method is as follows:

[0041] Compression molding step: molding the raw material powder into a compact; wherein, the raw material powder is nickel powder with a particle size range of 0.2-200 μm; or the raw material powder is silver-nickel mixed powder; in the silver-nickel mixed powder, nickel powder The particle size range is 0.2-200μm.

[0042] Specifically, the compression molding pressure is 30-40Mpa, and the holding time is 0.8-1.5h.

[0043]...

Embodiment 1

[0059] In this embodiment, a silver-nickel composite material is prepared, wherein the raw materials used include nickel powder and silver nuggets with an average particle size of 80-100 mesh.

[0060] Among them, the principle of preparing silver-nickel composite materials in this embodiment can be found in figure 1 As shown, the mold used is as Figure 2A and 2B as shown in figure 1 and Figure 2A , as shown in 2B, the specific preparation steps are as follows:

[0061] Molding steps: start molding, first wipe the mould, especially the inner wall and bottom, with absorbent cotton dipped in a small amount of alcohol, and then install the die 32 and the fixing ring 33 on the base 35 . Then add 20 g of nickel powder 11 with an average particle size of 80-100 mesh into the mold cavity, and use the upper punch 31 to preliminarily flatten it. Next, adjust the stroke of the hydraulic press to the fully open state, and place the entire mold and the nickel powder 11 at the cente...

Embodiment 2

[0065] In this embodiment, a silver-nickel composite material is prepared, wherein the raw materials used include nickel powder and silver alloy (AgCu5) with an average particle size of 30-50 μm. Concrete preparation steps are as follows:

[0066] Molding steps: start molding, first use absorbent cotton dipped in a small amount of alcohol to wipe the mold, especially the inner wall and bottom, and then install the die 32 and the fixing ring 33 on the base 35, such as Figure 2A and 2B As shown, then add 20 g of nickel powder with an average particle size of 30-50 μm into the cavity of the mold, and use the upper punch 31 to initially flatten it. Next, adjust the stroke of the hydraulic press to fully open the mold, and place the entire mold and nickel powder at the center of the hydraulic press. Finally, pressurize manually to 40MPa. After maintaining the pressure for 1 hour, remove the load and adjust the upper mold base to completely open the hydraulic press, and take out ...

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Abstract

The invention relates to a silver-nickel composite material and a preparation method thereof, and relates to the technical field of silver-based electrical contact materials. The technical solution mainly adopted is: a preparation method of silver-nickel composite material, including the following steps: molding step, molding the raw material powder into a block; wherein, the raw material powder is nickel powder or silver-nickel mixed powder; high temperature infiltration The step is to place the compact, silver block or silver alloy block together to obtain a mixed block; under a protective atmosphere, heat the mixed block to a set temperature, keep it warm at the set temperature for a set time, and obtain the mixed block after cooling. Silver-nickel composite material; wherein, the set temperature is higher than the melting point of silver, and the set temperature is lower than the melting point of nickel. The invention is mainly used to prepare a silver-nickel composite material with a simple and reliable process, and the prepared silver-nickel composite material has high nickel content, high strength, good welding resistance, high conductivity, plastic processing, etc. features.

Description

technical field [0001] The invention relates to the technical field of silver-based electrical contact materials, in particular to a silver-nickel composite material and a preparation method thereof. Background technique [0002] Silver-based electrical contact materials have the advantages of welding resistance, good electrical conductivity, small and stable contact resistance, etc., and have been widely used in various light and heavy load high and low voltage electrical appliances, household appliances, automotive electrical appliances, aerospace electrical appliances, especially circuit breakers and contactors, which are large and wide-ranging electrical appliances. [0003] Silver-based electrical contact materials are mainly divided into silver-carbon series, silver-tungsten carbide series, silver-nickel series and silver metal oxide series. Among them, the silver-nickel series does not require an additional silver layer for welding (that is, the cladding layer), with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C5/06C22C19/03B22D23/04
CPCB22D23/04C22C1/02C22C5/06C22C19/03
Inventor 刘增乾赵宁张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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