A preparation method of silver tin oxide electrical contact alloy with uniform structure

A technology of silver tin oxide with uniform structure, applied in the direction of circuits, electric switches, electrical components, etc., can solve the problems of high contact resistance, poor resistance to arc erosion, and uneven dispersion of electrical contact materials, and achieve good anti-welding performance, Good arc erosion resistance and uniform tissue distribution

Inactive Publication Date: 2018-10-02
XI'AN POLYTECHNIC UNIVERSITY
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Problems solved by technology

[0004] The purpose of the invention is to provide a method for preparing a uniform silver-tin oxide electrical contact alloy, which solves the problem of SnO in the preparation process of the existing silver-based electrical contact alloy. 2 Particles are prone to segregation in the Ag matrix, resulting in uneven dispersion, resulting in high contact resistance of electrical contact materials, poor arc erosion resistance, and short electrical life.

Method used

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  • A preparation method of silver tin oxide electrical contact alloy with uniform structure

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preparation example Construction

[0029] The preparation of the soluble starch aqueous solution template is as follows: adding soluble starch to distilled water to obtain a soluble starch solution with a mass concentration of 5-10%, heating the soluble starch solution in a water bath, first preheating it in 40-50°C water, and using a temperature control Stir with a magnetic stirrer. As the solution is further heated until it reaches 80°C, the starch is in a gelatinized state, the starch gradually dissolves, and the solution turns from white turbidity to clear, keep warm for 15 minutes, and then cool to 55-65°C to obtain a soluble starch aqueous solution template.

[0030] Add the mixed solution prepared in step 2 into the soluble starch aqueous solution template, and perform magnetic stirring at 45-55° C. for 1-2 hours. The volume ratio of distilled water to the mixed solution prepared in step 2 is 1-1.5:2.

[0031] Step 4, preparing silver tin oxide composite powder:

[0032] Put the mixed solution obtained...

Embodiment 1

[0040] Step 1, preparing HNO for dissolving Sn powder 3 solution and AgNO 3 Mixture of solutions:

[0041] Add Sn powder to HNO with a mass fraction of 65% 3 Stir evenly in the solution to obtain a Sn powder suspension. Slowly add the prepared Sn powder suspension to 1mol / L AgNO 3 aqueous solution to obtain a mixed solution. Among them, Sn powder and HNO 3 The ratio of the amount of substance is 3:2, Sn powder and AgNO 3 The ratio of the amount of substances is 1:1.

[0042] Step 2, add citric acid solution dropwise to the mixed solution and stir well:

[0043] The mixed solution prepared in step 1 was magnetically stirred at 50° C. for 2 hours, and 3 mol / L citric acid solution was added dropwise during the first half hour of stirring. Wherein the amount of citric acid substance and AgNO 3 The ratio to the sum of the amount of Sn powder is 1:1.

[0044] Step 3, add to the soluble starch aqueous solution, and stir evenly:

[0045] The preparation of the soluble starc...

Embodiment 2

[0052] Step 1, preparing HNO for dissolving Sn powder 3 solution and AgNO 3 Mixture of solutions:

[0053] Add Sn powder to HNO with a mass fraction of 66% 3 Stir evenly in the solution to obtain a Sn powder suspension. Slowly add the prepared Sn powder suspension to 1.5mol / L AgNO 3 aqueous solution to obtain a mixed solution. Among them, Sn powder and HNO 3 The ratio of the amount of substance is 3:2, Sn powder and AgNO 3 The ratio of the amount of substances is 1:1.

[0054] Step 2, add citric acid solution dropwise to the mixed solution and stir well:

[0055] The mixed solution prepared in step 1 was magnetically stirred at 55° C. for 3 hours, and 4 mol / L citric acid solution was added dropwise during the first half hour of stirring. Wherein the amount of citric acid substance and AgNO 3 The ratio of the sum of the amount of the Sn powder and the amount of the substance is 2:1.

[0056] Step 3, add to the soluble starch aqueous solution, and stir evenly:

[0057...

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Abstract

The invention provides a method for preparing Ag-SnO2 electric contact alloy with well-closed formation. The method comprises: a citric acid solution is added into a mixed solution of an HNO3 solution with Sn powder dissolved and a AgNO3 solution in a dropwise manner and stirring is carried out fully; the prepared mixed solution is added into a soluble starch water solution and the solutions are mixed completely; drying, calcining and grinding are carried out successively to obtain powder; and then compacting, sintering, amid extruding are carried out to obtain Ag-SnO2 electric contact alloy. According to the preparation method, with a sol-gel process, complexing with a metal salt solution is carried out by using the citric acid as a complexing agent to form a sol-gel material; the soluble starch water solution as a template is used as an oxide dispersion supporter to control the generated gel size. The Ag-SnO2 composite powder is prepared firstly and then the Ag-SnO2 alloy is prepared. With the method, stannic oxide can be dispersed in the silver matrix uniformly, so that the compressive performance of the Ag-SnO2 electric contact alloy can be improved. Meanwhile, the production efficiency can be improved; the preparation cost can be reduced; and impurity mixing can be reduced.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a method for preparing a silver-tin oxide electrical contact alloy with uniform structure. Background technique [0002] Ag-SnO 2 Electrical contact alloy is a commonly used contact material in low-voltage electrical appliances. It is widely used in various relays and circuit breakers. It is a non-toxic, harmless and environmentally friendly electrical contact material that has developed rapidly in recent years. As a reinforcing phase of metal matrix composites, SnO 2 The size, shape, wettability with metal Ag and distribution state in the Ag matrix have a great influence on the performance of the composite material. [0003] At present, material researchers at home and abroad have been studying to improve the performance of silver tin oxide by improving the preparation process and adding additives. In recent years, on Ag-SnO 2 Great progress has been made in the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H11/04C22C1/05
CPCC22C1/051H01H11/048
Inventor 付翀张宇慧仇润红侯锦丽王俊勃贺辛亥苏晓磊王彦龙
Owner XI'AN POLYTECHNIC UNIVERSITY
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