A kind of preparation method of tin oxide dispersion reinforced silver-based electrical contact alloy

A technology of dispersion enhancement and electrical contact, applied in contacts, circuits, electric switches, etc., can solve the problems of easy segregation of particles and easy introduction of impurities, etc., and achieve high cost, good resistance to fusion welding and arc erosion, fine particle effect

Inactive Publication Date: 2018-07-10
XI'AN POLYTECHNIC UNIVERSITY
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Problems solved by technology

[0004] The purpose of this invention is to provide a kind of preparation method of tin oxide dispersion reinforced silver-based electrical contact alloy, which solves the problem of SnO in the preparation process of existing silver-based electrical contact alloy. 2 The particles are easy to segregate in the Ag matrix and the problem of easy introduction of impurities

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  • A kind of preparation method of tin oxide dispersion reinforced silver-based electrical contact alloy

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preparation example Construction

[0037] The preparation method of a silver tin oxide electrical contact alloy of the present invention adopts a sol-gel process, uses citric acid as a complexing agent to complex with a metal salt solution to form a sol-gel, and uses an ashless filter paper as a template to disperse the oxide The carrier controls the size of the gel. The silver-tin oxide composite powder is prepared first, and then the silver-tin oxide alloy is prepared. Compared with traditional preparation techniques, its advantages are:

[0038] (1) The internal oxides of the obtained alloy are evenly distributed and the particles are fine, and the alloy has good welding resistance and arc erosion resistance.

[0039] (2) It overcomes the disadvantages of high cost and uneven structure in the preparation of the current technology, and also avoids the problem that the oxides are prone to agglomeration during conventional mechanical powder mixing.

[0040] (3) Using ashless filter paper as a template as a di...

Embodiment 1

[0042] Step 1, preparing HNO for dissolving Sn powder 3 solution and AgNO 3 Mixture of solutions:

[0043] Add Sn powder to HNO with a mass fraction of 65% 3 Stir the solution evenly 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.

[0044] Step 2, add citric acid solution dropwise to the mixed solution and stir well:

[0045]The mixed solution prepared in step 1 was magnetically stirred at 65° 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.

[0046] Step 3, impregnating ashless filter paper:

[0047] Fully soak 20 pieces of ashless filter paper in the mixed solution...

Embodiment 2

[0053] Step 1, preparing HNO for dissolving Sn powder 3 solution and AgNO 3 Mixture of solutions:

[0054] 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.

[0055] Step 2, add citric acid solution dropwise to the mixed solution and stir well:

[0056] The mixed solution prepared in step 1 was magnetically stirred at 60° 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.

[0057] Step 3, impregnating ashless filter paper:

[0058] Fully soak 20 pieces of ...

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Abstract

The invention provides a preparation method of a tin oxide dispersion reinforced silver base electrical contact alloy. The preparation method specifically comprises the following steps: mixed solution of HNO3 solution and AgNO3 solution for dissolving Sn powder is dripped with citric acid solution for full stirring; after full dipping of an ashless filter paper, powder is formed by drying, calcining and grinding; and a silver tin oxide electrical contact alloy is prepared by a pressing-sintering-extruding process. The preparation method adopts a sol-gel process to complex metal salt solution with citric acid as a complexing agent to form sol-gel, and meanwhile, uses the ashless filter paper as a template to serve as a dispersion carrier of an oxide to control the growth size of gel. Silver tin oxide composite powder is firstly prepared; and then, the silver tin oxide alloy is prepared. The method can effectively and uniformly disperse tin dioxide in a silver basal body to improve the performances of the silver tin oxide electrical contact alloy, and meanwhile, can improves the production efficiency and reduce the preparation cost.

Description

technical field [0001] The invention belongs to the technical field of material preparation and relates to a preparation method of a tin oxide dispersion reinforced silver-based electrical contact alloy. Background technique [0002] Ag-SnO 2 The electrical contact alloy is the second phase SnO 2 The metal matrix composite material with particles dispersed in the silver matrix is ​​a non-toxic, harmless and environmentally friendly electrical contact material that has developed rapidly in recent years. Ag-SnO 2 It has excellent arc erosion resistance, good thermal stability and wear resistance, good material transfer resistance, and excellent welding resistance, and is currently widely used in various relays and circuit breakers. [0003] Material researchers at home and abroad have been studying ways 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24C22C1/05C22C5/06C22C32/00H01H1/0237
CPCB22F9/24C22C1/05C22C5/06C22C32/0021H01H1/02376
Inventor 付翀张宇慧仇润红侯锦丽王俊勃徐洁苏晓磊王彦龙
Owner XI'AN POLYTECHNIC UNIVERSITY
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