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Method for preparing submicron silver-tin dioxide electrical contact material

A technology of electrical contact materials and tin dioxide, applied in the direction of contact materials, etc., can solve the problems of limited internal oxidation manufacturing process development, poor particle size uniformity, and difficult drawing molding, etc., to improve mechanical properties and arc resistance Aggressiveness, low production costs, high tensile strength effect

Inactive Publication Date: 2005-03-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Western European countries tend to use the powder metallurgy method, and Japan mainly uses the internal oxidation method, but in recent years, it has also actively developed the powder metallurgy contact. The high price limits the development of internal oxidation manufacturing process [1]
Different AgSnO 2 The manufacturing process of electrical contact materials has its own strengths, but there are obvious defects, such as: internal oxidation requires the use of high-pressure equipment to uniformly oxidize the material, and there will be no oxygen-poor areas
The contact material SnO is manufactured by powder metallurgy 2 The uniformity of particle size is poor, the powder is easy to pollute, it is not easy to draw and shape, the contact resistance is large during use, and the temperature rises. Therefore, AgSnO 2 The preparation process of electrical contact materials has become a difficult problem in production and research

Method used

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  • Method for preparing submicron silver-tin dioxide electrical contact material
  • Method for preparing submicron silver-tin dioxide electrical contact material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0011] a. Mix silver powder, tin dioxide and cerium oxide or lanthanum oxide powder in a ratio of 88%: 10%: 2%; then put them into a stainless steel high-speed ball mill tank, and add 0.8 per kilogram of powder to the ball mill tank 1 mL of triethanolamine dispersant and 10% acetone solution 400 mL of protective agent; after 70 hours of high-speed ball milling at a speed of 600-800 rpm, a mixed powder of submicron silver-tin dioxide with an average particle size of 200-300 nm is obtained ;

[0012] b. The mixed powder of submicron silver-tin dioxide is formed by isostatic pressing at 350-500 MPa at a temperature of 20°C, and sintered at 700-800°C for 4-10 hours.

[0013] c. Extrude the sintered material at 700°C with an extrusion ratio of 200; obtain a wire rod of Φ3.5-5.0mm, and then draw the wire rod at 20°C with a drawing speed of 2 m / min to Φ2 .7 ~ 1.38mm wire.

[0014] Density of wire: 9.9~10.7kg / cm 3 ; Resistivity: 2.1~2.2μΩ.cm; Hardness: HV860~1100MPa; Tensile streng...

Embodiment 2

[0016] a. Mix silver powder, silver tin oxide and cerium oxide or lanthanum oxide powder in a ratio of 85%: 10%: 5%; then put them into a stainless steel high-speed ball mill tank, and add 0.3 per kilogram of powder to the ball mill tank. mL of triethanolamine dispersant and 10% acetone solution and 500 mL of protective agent; after 70 hours of high-speed ball milling at a speed of 600-800 rpm, a mixed powder of submicron silver tin oxide with an average particle size of 250-350 nm was obtained;

[0017] b. The mixed powder is isostatically pressed at 400-450MPa at a temperature of 20°C, and sintered at 750-800°C for 6-8 hours.

[0018] c. Extrude the sintered material at 700°C with an extrusion ratio of 200; obtain a wire rod of Φ3.5-5.0mm, and then draw the wire rod at 20°C with a drawing speed of 2 m / min to Φ2 .7 ~ 1.38mm wire.

[0019] Wire density: 9.8~10.5kg / cm 3 ; Resistivity: 2.1~2.2μΩ.cm; Hardness: HV920~1000MPa; Tensile strength: 280~350MPa; Elongation: 25~32%.

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Abstract

Disclosed is a manufacture method for electric contact material of submicron silver-stannic oxide material which belongs to electric material technical field. Its characteristics is that the following steps are included silver of 12~94.9%, stannic oxide of 5~20% and cerium oxide or lanthanum oxide powder of 1.0-8% are added according to weight ratio into stainless steel high speed ball grinder, and dispersion agent of triethanolamine and protective agent of acetone solution are added to form mixed powder of 350-400nm which then will be changed into rivet-typed electric contact material of submicron silver-stannic oxide material through pressing, sinter, hot extrusion and cold-finish drawing. It has the advantage of simple manufacture technique, low cost and suitable for production of larger scale, the contact material has high electric conductivity ,symmetric tissue, excellent tensile strength, resistance to fusion welding and electric arc burnt.

Description

technical field [0001] The invention relates to a method for preparing a submicron silver-tin dioxide electrical contact material, which belongs to the technical field of electrical materials. Background technique [0002] The early electrical contact materials mostly used pure silver, but the hardness of silver is not high, the melting point is low, and it is not wear-resistant; in humid and vulcanized media, a silver sulfide film is formed on the surface; under the action of direct current, due to the low hardness and easy Volatile, resulting in arc erosion and electrical wear, thus making the electrical contacts invalid. In order to overcome the defects of silver electrical contact materials, AgNi, AgW, AgC, AgMeO (silver metal oxide) electrical contact materials have been developed. Among electrical contact materials, silver metal oxide materials are widely used in low-voltage electrical appliances due to their good electrical wear resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/06H01H1/02
Inventor 郑冀李松林高后秀李群英张勇
Owner TIANJIN UNIV
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