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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  • Abstract
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  • Claims
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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 per

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

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Example Embodiment

[0052] After extensive and in-depth research, the inventor established a method for preparing silver tin oxide composite powder. Specifically, the method includes the steps of dissolving metallic silver and metallic tin in a 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 the organic polymer, and performing a precipitation reduction reaction, Obtain a solution containing silver tin oxide suspension; filter the solution containing silver tin oxide suspension, wash, dry, and crush the silver tin oxide mixture to obtain a powder with a particle size of less than 10 μm; heat the obtained powder, The silver tin oxide composite powder was obtained. The particle size prepared by the method is less than 10 μm, and the silver tin oxide composite powder has the characteristics of high element distribution uniformity, little powder agglomeration and good sintering performance. The pr...

Example Embodiment

[0078] Example 1

[0079] Dissolve metallic silver in nitric acid with a concentration of 0.2mol / L to form a silver nitrate solution. The dissolution temperature is 0°C. Dissolve metallic tin powder in nitric acid with a concentration of 0.15mol / L to form a tin nitrate solution. The dissolution temperature is 0°C. For ice water bath.

[0080] The above-mentioned silver nitrate solution and tin nitrate solution are mixed, and polyvinyl alcohol is added thereto at the same time, wherein the mass of the polyvinyl alcohol is 2% of the mass of the silver tin oxide powder, and the addition of high molecular weight substances is carried out at a temperature of 5°C. The proportional relationship between silver and tin is that the ratio of the mass of silver to the mass of the added tin completely converted into tin oxide is 75:25.

[0081] The hydrazine hydrate with a concentration of 0.3 mol / L was added dropwise to the above solution for precipitation reduction reaction, and the temperatur...

Example Embodiment

[0082] Example 2

[0083] Dissolve metallic silver in nitric acid with a concentration of 2.0 mol / L to form a silver nitrate solution. The dissolution temperature is 30°C. Dissolve metallic tin powder in nitric acid with a concentration of 3.0 mol / L to form a tin nitrate solution. The dissolution temperature is 0°C. For ice water bath. Mix the above-mentioned silver nitrate solution and tin nitrate solution, and add polyethylene glycol to it at the same time, where the weight of polyethylene glycol is 12% of the weight of the silver tin oxide powder obtained according to theory, and the high molecular weight substance is added at a temperature of 25 ℃. The proportional relationship between silver and tin is that the ratio of the mass of silver to the mass of the added tin completely converted into tin oxide is 85:15. The hydrazine hydrate with a concentration of 3.0 mol / L was added dropwise to the above solution for precipitation reduction reaction, and the temperature during t...

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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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