A kind of aging granulation powder of silver-based electric contact material and preparation method thereof

A technology of electrical contact materials and granulated powder, applied in nanotechnology for materials and surface science, metal processing equipment, transportation and packaging, etc., can solve problems such as easy hardening and difficult degumming, and achieve uniform particle distribution and production The effect of short cycle time and good powder fluidity

Active Publication Date: 2021-08-20
WENZHOU HONGFENG ELECTRICAL ALLOY
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Problems solved by technology

[0004] The purpose of the present invention is to provide a silver-based electrical contact material powder aging granulation and its preparation method. By controlling the coating influence factors such as aging temperature, aging time, and surface modifier type, the crystal form is prepared in situ. High-quality coated powder with high sphericity, uniform particle size distribution and good formability, which solves the technical difficulties such as difficult degumming and easy hardening existing in the existing powder granulation process

Method used

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  • A kind of aging granulation powder of silver-based electric contact material and preparation method thereof

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preparation example Construction

[0026] (1) Preparation of silver solution

[0027] Configure 0.65~0.79mol / L AgNO 3 In the aqueous solution, a certain mass percent (1-5wt.%) surfactant is added, and after fully dissolving, a reducing agent in an equal molar ratio to Ag+ is added to form a silver solution. Wherein, the reducing agent type is glucose, ethylene glycol, ascorbic acid and the like.

[0028] The silver solution prepared in this step is the basic condition for synthesizing high-quality silver nanoparticles. The silver solution system is composed of an oxidation solution, a reduction solution and a surface modifier according to a certain stoichiometric ratio. Then add WC powder and C powder to the silver solution, and use the principle of heterogeneous nucleation to realize uniform coating of Ag particles on the surface of WC powder and C powder.

[0029] (2) Preparation of precursor solution

[0030] Using silver solution, WC, and C powder as raw materials, calculate according to the target gran...

Embodiment 1

[0033] (1) Preparation of silver solution

[0034] Weigh silver nitrate (AgNO 3 ) mass 13.38g, configuration 0.79mol / L, 100ml of AgNO 3 Aqueous solution, add the polyvinylpyrrolidone K30 that accounts for the mass percent of silver nitrate total amount and be 5wt.%, add after fully dissolving and Ag+ same molar ratio (n(Ag + )=0.079mol) of the reducing agent to form a silver solution. Among them, the reducing agent is glucose.

[0035] (2) Preparation of precursor solution

[0036] Using silver solution, WC, and C powder as raw materials, calculate the stoichiometric ratio according to the target granulated powder Ag / WC(12)C(3) and weigh the corresponding raw material ratio content. Weigh 1.2g of tungsten carbide WC powder and 0.3g of graphite C powder, then add the corresponding ratio of WC powder and C powder to the above silver solution, and stir well to form a precursor solution.

[0037] (3) Put the precursor solution into a stirred hydrothermal reaction kettle, add ...

Embodiment 2

[0039] (1) Preparation of silver solution

[0040] Weigh silver nitrate (AgNO 3 ) mass 11.81g, configuration 0.70mol / L, 100ml of AgNO 3 In the aqueous solution, polyvinylpyrrolidone K30 with a mass percentage of 1wt.% of the total amount of silver nitrate is added, and after fully dissolving, a reducing agent with the same molar ratio as Ag+ is added to form a silver solution. Wherein, the reducing agent is ethylene glycol.

[0041] (2) Preparation of precursor solution

[0042] Using silver solution, WC, and C powder as raw materials, calculate the stoichiometric ratio according to the target granulated powder Ag / WC(22)C(3) and weigh the corresponding raw material ratio content. Weigh 2.2g of tungsten carbide WC powder and 0.3g of graphite C powder, then add the corresponding ratio of WC powder and C powder into the silver solution, and stir well to form a precursor solution.

[0043] (3) Put the precursor solution into a stirred hydrothermal reaction kettle, add polyethy...

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Abstract

The invention discloses a silver-based electrical contact material powder aging granulation and a preparation method thereof. The method first prepares a silver solution: configuring AgNO 3 Aqueous solution, add surfactant, after fully dissolved, add reducing agent with the same molar ratio as Ag+; then prepare precursor solution: use silver solution, WC, C powder as raw materials, calculate the stoichiometric ratio according to the target granulated powder and weigh Corresponding raw materials, and then adding WC powder and C powder corresponding to the ratio into the silver solution; in-situ reaction by stirring hydrothermal method to obtain the final silver-based electrical contact material powder aging and granulation. Based on the principle of Oswalt aging, the present invention prepares high-quality chemically coated Ag / WC‑C Oswalt aging granulation powder with complete crystal form, high sphericity, uniform particle size distribution and good formability in situ, solving the problem The existing powder granulation process has technical difficulties such as difficult degumming and easy hardening.

Description

technical field [0001] The invention relates to the field of powder preparation of electrical contact materials, in particular to aging granulation of silver-based electrical contact material powder and a preparation method thereof. Background technique [0002] Silver-based electrical contact materials are widely used in electric power, electronics, electrical appliances and other fields because of their high electrical conductivity, thermal conductivity, good welding resistance and good arc ablation resistance. Ag / WC-C, Ag / Ni-C, Ag / Ni and other material contacts used in circuit breaker switches are mainly produced by powder metallurgy, and the formability of powder has a decisive influence on the powder metallurgy production process, so The granulation of powder is one of the main factors affecting the production process of silver-based electrical contact materials. At present, the preparation method of powder mainly adopts the methods of mixing rubber granulation and bur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24B82Y30/00B82Y40/00
CPCB22F9/24B82Y30/00B82Y40/00B22F1/054B22F1/17
Inventor 吴新合祁更新吕鹏举陈家帆费玲娟
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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