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A preparation method of fiber particle blending reinforced silver tin oxide electrical contact alloy

A technology of fiber particles, silver tin oxide, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of increasing contact resistance of contact materials, affecting the performance and life of contact materials, and temperature rise, etc., to improve performance. and service life, simple skeleton action, and the effect of improving dispersibility

Active Publication Date: 2022-03-25
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whether it is the use of additives or the second phase oxide SnO 2 refinement, are prone to the second phase oxide SnO 2 Floating on the surface of the silver molten pool under the action of the arc for many times, the re-enrichment of tin oxide produces segregation, which causes the contact resistance of the contact material to increase and the temperature rise is high, which seriously affects the service performance and life of the contact material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A preparation method of fiber particle blending enhanced silver tin oxide electrical contact alloy, specifically according to the following steps:

[0049] Fully dissolving tin chloride hydrate in a mixed solution with a volume ratio of absolute ethanol and N,N-dimethylformamide of 1:1.0 and stirring evenly to obtain a mixed solution with a concentration of tin chloride of 0.34 mol / L. 18wt% of polyvinylpyrrolidone (PVP-K45) was added to the mixed solution and mixed uniformly to obtain a spinning precursor solution. The precursor solution is electrospun to obtain a uniform and continuous fiber filament film. Electrospinning process parameters: positive voltage 16kv, negative voltage 4kv, receiving distance 14cm, syringe pump flow rate 0.8mL / h, temperature 20°C, relative humidity 45%RH. The fiber filament film is placed in a programmed temperature furnace for high temperature calcination to obtain tin oxide fibers. First slowly heat from room temperature to 500 °C, the ...

Embodiment 2

[0053] A preparation method of fiber particle blending enhanced silver tin oxide electrical contact alloy, specifically according to the following steps:

[0054] Fully dissolving tin chloride hydrate in a mixed solution with a volume ratio of absolute ethanol and N,N-dimethylformamide of 1:1.05 and stirring evenly to obtain a mixed solution with a concentration of tin chloride of 0.40 mol / L. 20wt% of polyvinylpyrrolidone (PVP-K45) was added to the mixed solution and mixed uniformly to obtain a spinning precursor solution. The precursor solution is electrospun to obtain a uniform and continuous fiber filament film. Electrospinning process parameters: positive voltage 18kv, negative voltage 4.25kv, receiving distance 16cm, syringe pump flow rate 1.0mL / h, temperature 20°C, relative humidity 48%RH. The fiber filament film is placed in a programmed temperature furnace for high temperature calcination to obtain tin oxide fibers. First slowly heat from room temperature to 500 °C, ...

Embodiment 3

[0058] A preparation method of fiber particle blending enhanced silver tin oxide electrical contact alloy, specifically according to the following steps:

[0059] Fully dissolving tin chloride hydrate in a mixed solution with a volume ratio of absolute ethanol and N,N-dimethylformamide of 1:1.1 and stirring evenly to obtain a mixed solution with a concentration of tin chloride of 0.46 mol / L. 22wt% of polyvinylpyrrolidone (PVP-K45) was added to the mixed solution and mixed uniformly to obtain a spinning precursor solution. The precursor solution is electrospun to obtain a uniform and continuous fiber filament film. Electrospinning process parameters: positive voltage 19kv, negative voltage 4.5kv, receiving distance 17cm, syringe pump flow rate 1.1mL / h, temperature 20°C, relative humidity 50%RH. The fiber filament film is placed in a programmed temperature furnace for high temperature calcination to obtain tin oxide fibers. First slowly heat from room temperature to 500 °C, th...

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PUM

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Abstract

The invention discloses a preparation method of fiber particle blending reinforced silver tin oxide electrical contact alloy, using electrospinning technology to use tin chloride hydrate as the tin source, polyvinylpyrrolidone as the polymer matrix, and adjusting the spinning process parameters Control the shape of the product to obtain tin oxide fibers; adjust the pH value with ammonia water by chemical co-precipitation method, and prepare tin oxide particles with polyethylene glycol as the dispersant; obtain fiber particle blending reinforced silver-tin oxide composite powder through high-energy ball milling Body, preparation of fiber particle blend reinforced silver-based electrical contact alloy. The inside of the alloy is a uniformly distributed second-phase oxide: tin oxide microsphere particles and fibers with uniform aspect ratio, which improve the dispersion of the second-phase tin oxide in the silver matrix and prevent the second-phase tin oxide from being suspended in the liquid silver melt In the pool, it is separated from the silver matrix and enriched on the surface of the contact, maintaining the uniformity of the second phase under the action of arc erosion, and improving the arc erosion resistance and service life of the silver tin oxide electrical contact alloy.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a preparation method of a fiber particle blending reinforced silver tin oxide electrical contact alloy. Background technique [0002] Ag-SnO 2 As an Ag-MeO type electrical contact material, the electrical contact material not only has excellent welding resistance, arc erosion resistance, thermal stability, etc., but also has the advantages of environmental protection, no pollution, and no harm to the human body, thus successfully replacing toxic Ag -CdO alloy is widely used in low-voltage electrical appliances. [0003] In recent years, contact researchers at home and abroad have mostly added trace additives and second-phase oxide SnO. 2 Nanometerization and other ways to improve the performance of silver tin oxide. 1. The product performance of silver tin oxide is improved by adding trace additives to improve the wettability between the silver matrix ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C47/14C22C49/02C22C49/14D01F9/10C22C101/02
CPCC22C47/14C22C49/02C22C49/14D01F9/10
Inventor 付翀王金龙侯锦丽闫贞王亮常延丽王俊勃
Owner XI'AN POLYTECHNIC UNIVERSITY