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Silver tungsten carbide graphite composite material added with nickel alloy and preparation method thereof

A tungsten carbide graphite and composite material technology, which is applied in metal processing equipment, coating, transportation and packaging, etc., can solve the problems of easy segregation of material components, high environmental hazards, high cost of ammonia nitrogen waste liquid treatment, and improve the compactness. , The effect of good tissue uniformity and high activity

Inactive Publication Date: 2020-07-03
WENZHOU LONGSUN ELECTRICAL ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, domestic silver tungsten carbide graphite composite materials mainly adopt the mechanical powder mixing process, but the material components prepared by this method are prone to segregation, and need to be repressed to achieve densification after sintering; Silver tungsten carbide and graphite composite materials are prepared by solution coating tungsten carbide and graphite. The material prepared by this method has good uniformity, but also has the problem of repressing after sintering to achieve densification. The operator and the environment are very harmful, and the treatment cost of ammonia nitrogen waste liquid is high

Method used

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  • Silver tungsten carbide graphite composite material added with nickel alloy and preparation method thereof
  • Silver tungsten carbide graphite composite material added with nickel alloy and preparation method thereof

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[0041] The embodiment of the present invention also provides a preparation method of silver tungsten carbide graphite composite material with nickel alloy added, the process flow chart is as follows figure 1 shown, including the following steps:

[0042] (1) Preparation of composite powder of silver-coated tungsten carbide and silver-coated graphite;

[0043] (2) Add nickel alloy powder to the composite powder, and obtain preformed powder through mechanical powder mixing, reduction and granulation;

[0044] (3) Initially press the preformed powder into a preform;

[0045] (4) Sintering the preform to obtain a silver-tungsten carbide-graphite composite material with nickel alloy added.

[0046] Preferably, the composite powder in step (1) is prepared by chemical coating method, including the following steps:

[0047] (11) Preparation of silver salt solution;

[0048] (12) Prepare a mixed solution containing tungsten carbide powder, graphite powder, reducing powder and water...

Embodiment 1

[0061] Embodiment 1 of the present invention provides a silver tungsten carbide graphite composite material with nickel alloy added and a preparation method thereof, comprising the following steps:

[0062] (1) Preparation of silver tungsten carbide graphite composite powder by chemical coating method:

[0063] Calculate the mass of tungsten carbide powder, graphite powder, copper powder and silver nitrate according to the composition of silver-coated tungsten carbide graphite composite powder: silver 85%, tungsten carbide 12%, graphite 3%;

[0064] Prepare a silver nitrate solution a with a concentration of 5 mol / L and a temperature of 25°C;

[0065] Select tungsten carbide powder with an average particle size of 2 μm, graphite powder of 4 μm, copper powder of 300 mesh and deionized water to prepare mixed solution b. Calculated by the complete reaction of copper powder in mixed solution b to generate 1 kg of silver, the required amount of deionized water is 4 L. The temperat...

Embodiment 2

[0075] Embodiment 2 of the present invention provides a silver tungsten carbide graphite composite material with nickel alloy added and a preparation method thereof, comprising the following steps:

[0076] (1) Preparation of silver tungsten carbide graphite composite powder by chemical coating method:

[0077] Calculate the mass of tungsten carbide powder, graphite powder, copper powder and silver nitrate according to the composition of silver-coated tungsten carbide graphite composite powder: silver 85%, tungsten carbide 12%, graphite 3%;

[0078] Prepare a silver nitrate solution a with a concentration of 7mol / L and a temperature of 25°C;

[0079] Select tungsten carbide powder with an average particle size of 2 μm, graphite powder with 28 μm, copper powder with 200 mesh and deionized water to prepare mixed liquid b. Calculated by the complete reaction of copper powder in mixed liquid b to generate 1 kg of silver, the required amount of deionized water is 5 L. The temperat...

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Abstract

The invention provides a silver tungsten carbide graphite composite material added with a nickel alloy and a preparation method thereof. The silver tungsten carbide graphite composite material comprises the following components including, by weight, 3% to 28% of tungsten carbide, 1% to 6% of graphite, 0.05% to 0.5% of the nickel alloy and the balance silver. The silver tungsten carbide graphite composite material added with the nickel alloy adopts the silver as a matrix material, tungsten carbide particles are used as a reinforcing phase, graphite particles are used as an arc extinguishing material, the nickel alloy is used as an additive, and the composite material has good organization uniformity and compactness. The silver tungsten carbide graphite composite material prepared by the method has the advantages that a layer of silver material is arranged on the surfaces of the tungsten carbide and the graphite particles, the sintering activity of a silver phase is higher than that of the tungsten carbide and thegraphite, and the number of pores is small after sintering; and then a nickel-phosphorus alloy being 4% to 15% phosphorus is added, the melting temperature of the nickel-phosphorus alloy is lower than the sintering temperature of the method, during sintering, the nickel-phosphorus alloy melts, and the molten nickel-phosphorus alloy is filled into the pores of the silvertungsten carbide graphite composite material, so that the aim of improving the compactness of the silver tungsten carbide graphite composite material is achieved.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy electrical contact materials, [0002] In particular, the present invention relates to a silver tungsten carbide graphite composite material added with nickel alloy and a preparation method thereof. Background technique [0003] Silver tungsten carbide graphite composite material is one of the commonly used contact materials for various low-voltage electrical appliances. In order to meet the performance requirements of low-voltage electrical appliances for electrical contact materials, silver-based composite reinforcement materials are usually used. Tungsten carbide has a very high melting point, and tungsten carbide particles are added to the silver-based material as a reinforcement, which effectively improves the arc erosion resistance of the material. In addition, graphite particles are added to the silver-based material as an arc extinguishing material. Graphite is oxidized under ...

Claims

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Application Information

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IPC IPC(8): C22C5/06C22C32/00C22C1/04B22F1/02
CPCC22C5/06C22C32/0052C22C1/0466B22F1/17
Inventor 陈文孝冯如信于秀清卢云平郑元龙蒋源胡登炜
Owner WENZHOU LONGSUN ELECTRICAL ALLOY CO LTD
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