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Prepn process of nanometer tin oxide material with surface decorating silver

A nano-tin oxide and surface modification technology, which is applied in the field of preparation of nano-tin oxide materials, can solve the problems of poor plasticity and ductility of materials, increased contact resistance, limited popularization and application, etc. Simple and easy method

Inactive Publication Date: 2006-05-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Ag and SnO 2 The wettability of the material is poor, resulting in poor plasticity and ductility of the material, and it is not easy to draw; secondly, due to SnO 2 Under the action of the arc, it is separated from Ag and enriched on the surface of the contact, which increases the contact resistance of the material and reduces the electrical life, which limits the Ag-SnO 2 Promoted application of

Method used

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  • Prepn process of nanometer tin oxide material with surface decorating silver
  • Prepn process of nanometer tin oxide material with surface decorating silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Decentralized processing

[0013] The prepared SnO with a particle size of 20-30 nm 2 Put 50 grams into a container, add 100 ml of absolute ethanol, then add 0.4 ml of surfactant polyethylene glycol as a dispersant, put it into an ultrasonic wave with a power of 2000W for 4 hours, dry it at 100°C and set it aside for use .

[0014] (2) Electroless plating treatment method of nano tin oxide powder

[0015] 50 grams of nano-tin oxide after the dispersion treatment is put into distilled water, and adding mass concentration is 15ml of 20% silver nitrate solution solution, and the method that combines electromagnetic stirring and vibration in ultrasonic wave makes nano-tin oxide and [Ag(NH 3 ) 2 ] + Disperse evenly, stir for 30 minutes; add 20ml reducing agent hydrazine hydrate (H 2 NNH 2 ×H 2 O) Reducing silver ions to obtain silver-coated nano-tin oxide powder, and then drying at 80°C to obtain a product.

[0016] (3) Mix the surface-modified nano-tin oxide pow...

Embodiment 2

[0020] (1) Decentralized processing

[0021] Put 80 grams of tin oxide with a particle size of 20-30 nanometers into a container, add 200 milliliters of absolute ethanol, then add 1.2 milliliters of surfactant polyethylene glycol as a dispersant, and put it into an ultrasonic wave with a power of 2000W for dispersion treatment After 6 hours, dry it at 80°C before use.

[0022] (2) Electroless plating treatment method of nano tin oxide powder

[0023] 80 grams of nano-tin oxide after dispersion treatment is put into distilled water, and adding mass concentration is 30% silver nitrate solution solution 30ml, the method that combines with electromagnetic stirring and vibration in ultrasonic wave makes nano-tin oxide and [Ag(NH 3 ) 2 ] + Disperse evenly, stir for 30 minutes; add 60ml reducing agent hydrazine hydrate (H 2 NNH 2 ×H 2 O) Reducing silver ions to obtain silver-coated nano-tin oxide powder, and then drying at 100° C. to obtain a product.

Embodiment 3

[0025] (1) Decentralized processing

[0026] Put 20 grams of the prepared tin oxide with a particle size of 20-30 nanometers into a container, add 200 ml of absolute ethanol, then add 0.24 ml of surfactant polyethylene glycol as a dispersant, and put it into an ultrasonic wave with a power of 2000W for dispersion treatment After 4 hours, dry it at 120°C before use.

[0027] (2) Electroless plating treatment method of nano tin oxide powder

[0028] 20 grams of nano-tin oxide after dispersion treatment is put into distilled water, and adding mass concentration is 20ml of 30% silver nitrate solution solution, and the method that combines with electromagnetic stirring and vibration in ultrasonic wave makes nano-tin oxide and [Ag(NH 3 ) 2 ] + Disperse evenly, stir for 20 minutes; add 40ml reducing agent hydrazine hydrate (H 2 NNH 2 ×H 2 O) Reducing silver ions to obtain silver-coated nano-tin oxide powder, and then drying at 100° C. to obtain a product.

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Abstract

The present invention relates to the preparation process of nanometer tin oxide material with surface decorating silver, and belongs to the field of electric contact material preparing technology. The preparation process includes the following steps: adding tin oxide powder of 20-30 nm size into anhydrous ethanol and adding polyglycol as dispersant; ultrasonic stirring at room temperature and stoving; adding the treated nanometer tin oxide powder into 10-30 % concentration silver nitrate solution via electromagnetic and ultrasonic stirring for homogeneous dispersion; adding reductant hydrazine hydrate to reduce silver ion and obtain silver coated nanometer tin oxide powder and stoving at 80-120 deg.c. The present invention has the advantages of simple technological process and being suitable for industrial production, and the surface decorated nanometer tin oxide may be used in producing electric contact with excellent mechanical performance and high conductivity.

Description

technical field [0001] The invention relates to a preparation method of a silver-surface-modified nano-tin oxide material, which belongs to the preparation technology of electrical contact materials. Background technique [0002] The surface modification technology of nanoparticles is an emerging science, which uses physical and chemical methods to change the structure and state of the surface of nanoparticles, thereby endowing the particles with new characteristics and improving their physical properties (such as particle size, fluidity, electrical properties, etc.) Improve and realize people's control over the surface of nanoparticles. Ag-SnO 2 The contact material is a new type of non-toxic electrical contact material. It has good thermal stability, arc corrosion resistance and welding resistance. It is an ideal material to replace toxic silver cadmium oxide in contactors, relays and switches. But Ag and SnO 2 The wettability of the material is poor, resulting in poor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/628B22F9/24
Inventor 郑冀李松林李群英高晶张尧卿
Owner TIANJIN UNIV
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