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Preparation method for silver and stannic oxide composite powder and application thereof

A technology of silver tin oxide and composite powder, which is applied to contacts, electrical components, circuits, etc., and can solve problems such as failure to meet environmental protection requirements, complicated production process, and large investment in equipment.

Active Publication Date: 2012-07-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The silver tin oxide materials prepared by the above methods generally still have disadvantages such as poor material performance, complicated production process, large equipment investment, and failure to meet environmental protection requirements.

Method used

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  • Preparation method for silver and stannic oxide composite powder and application thereof

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preparation example Construction

[0052] After extensive and in-depth research, the present inventor has established a preparation method of silver tin oxide composite powder. Specifically, the method includes the steps of: respectively dissolving metallic silver and metallic tin in nitric acid solution to obtain a silver nitrate solution and a tin nitrate solution; mixing the silver nitrate solution and the tin nitrate solution with an organic polymer, and performing a precipitation reduction reaction, Obtaining a solution containing a suspension of silver tin oxide; filtering the solution containing a suspension of silver tin oxide, washing, drying, and pulverizing the silver tin oxide mixture to obtain a powder with a particle size of less than 10 μm; heat-treating the obtained powder, Obtain silver tin oxide composite powder. The particle size of the silver-tin oxide composite powder prepared by the method is less than 10 μm, and the silver-tin oxide composite powder has the characteristics of high element...

Embodiment 1

[0079] Dissolve metallic silver in nitric acid with a concentration of 0.2mol / L to form a silver nitrate solution at a temperature of 0°C, and dissolve metal tin powder in nitric acid with a concentration of 0.15mol / L to form a tin nitrate solution at a temperature of 0°C. for an ice water bath.

[0080] Mix the above silver nitrate solution and tin nitrate solution, and add polyvinyl alcohol to it at the same time, wherein the mass of polyvinyl alcohol is 2% of the mass of the silver tin oxide powder, and the high molecular weight substance is added at a temperature of 5°C. The ratio between silver and tin is 75:25 for the mass ratio of silver to the mass of tin added after it is completely converted into tin oxide.

[0081] Hydrazine hydrate with a concentration of 0.3 mol / L was added dropwise to the above solution to carry out precipitation reduction reaction, and the temperature during the reaction was controlled at 10°C to obtain a silver gray suspension. Use plate and f...

Embodiment 2

[0083] Dissolve metallic silver in nitric acid with a concentration of 2.0mol / L to form a silver nitrate solution at a dissolution temperature of 30°C, and dissolve metal tin powder in nitric acid with a concentration of 3.0mol / L to form a tin nitrate solution at a dissolution temperature of 0°C. for an ice water bath. The above-mentioned silver nitrate solution and tin nitrate solution are mixed, and polyethylene glycol is added thereto at the same time, wherein the quality of polyethylene glycol is 12% of the mass of silver tin oxide powder obtained according to theory, and the high molecular weight substance is added at a temperature of 25 ℃. The ratio between silver and tin is 85:15 for the mass ratio of silver to the mass of tin added after it is completely converted into tin oxide. Hydrazine hydrate with a concentration of 3.0 mol / L was added dropwise to the above solution to carry out precipitation reduction reaction, and the temperature during the reaction was control...

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Abstract

The invention provides a preparation method for silver and stannic oxide composite powder and an application thereof. Particularly, Silver is dissolved into nitric acid to form an aqueous solution; dissolving metal stannic powder into deionized water at a low temperature (ice-water bath) to form a stannum nitride solution; mixing the above two solutions; adding the polymer into the mixture to obtain a mixed solution; dropwise adding hydrazine hydrate into the above solution; carrying out a redox reaction and obtaining sediments; and washing, drying, smashing and carrying out heat treatment on the sediments to obtain the silver and stannic oxide composite powder, wherein the particle diameter of the powder body is within the nanoscale range. The silver stannic oxide composite powder prepared with the method can be used for sintering and manufacturing a low-voltage electric contact. The technology is simple and easy to operate and has the advantages of high powder quality and low production cost.

Description

technical field [0001] The invention relates to the field of electrical materials, in particular to a method for preparing silver-tin oxide composite powder and its application. Background technique [0002] Electrical contacts are key components of electrical switches, instruments, etc., in contactors, relays and small power circuit breakers. Among them, Ag acts as a matrix phase to conduct electricity and heat, and metal oxide MeO as a dispersed phase distributes in the Ag matrix to enhance discontinuous dispersion. For a long time, Ag-CdO contacts have been widely used at home and abroad. The annual output value of AgMeO materials in my country is about several billion yuan, of which AgCdO (silver cadmium oxide) accounts for 60%. Although Ag-CdO contacts have the advantages of good arc extinguishing performance and stable contact resistance, in recent years, with the extension of service life and miniaturization requirements of electrical appliances, AgCdO contact materi...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F9/24B22F1/00H01H1/0237
Inventor 蒋俊张建荣黄华成肖昱琨凌玲王晓媛许国栋许高杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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