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Spray atomization technology of silver tin oxide material

A technology of silver tin oxide and spray atomization, which is applied in the direction of electrical components, circuits, electric switches, etc., can solve the problems of increased production costs, and achieve the effects of short production cycle, reduced production cost, and environmentally friendly production process

Active Publication Date: 2010-08-11
NINGBO HANBO PRECIOUS METAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure that the tin element is oxidized into tin oxide, the method needs to add noble metal indium, which increases the production cost

Method used

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  • Spray atomization technology of silver tin oxide material
  • Spray atomization technology of silver tin oxide material
  • Spray atomization technology of silver tin oxide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Weigh 5 kg of SnO 2 Powder, add 0.3kg Bi 2 o 3 powder, ball milled in a planetary ball mill and mixed for 30 minutes, the mixed SnO 2 The powder is calcined in a high-temperature calciner. During calcination, it is kept at 100°C for 0.5 hours, at 520°C for 0.5 hours, and at 1100°C for 2 hours. Calcined SnO 2 The powder was wet milled in a stirring ball mill for 2 hours, and the SnO 2 The ratio of powder to water is 0.5, and the ball powder ratio is 3.0. SnO after wet milling 2 Powder detection of SnO with laser particle size analyzer 2 Powder particle size, guarantee D 50 From 0.5 micron to 0.8 micron, the particles smaller than 1 micron should be more than 90%, and the particles larger than 3 microns should be less than 3%. Dry the wet-milled SnO in a vacuum oven 2 pink.

[0058] Accurately weigh 3 kg of treated SnO 2 Dry powder, add to the powder feeder of the jet atomizer. Add 22 kg of pure silver ingots to the intermediate frequency crucible of the spray...

Embodiment 2

[0064] Weigh 5 kg of SnO 2 Powder, add 0.5 kg Sb 2 o 3 powder, ball milled in a planetary ball mill and mixed for 30 minutes, the mixed SnO 2 The powder is calcined in a high-temperature calciner. During calcination, it is kept at 400° C. for 0.5 hours, at 700° C. for 0.5 hours, and at 1150° C. for 2 hours; others are the same as in Example 1.

[0065] Metallographic testing, scanning electron microscopy and rivet processing performance analysis of the wire products show that the prepared wire products also have good structure uniformity and processing performance.

Embodiment 3

[0067] Weigh 3 kg of SnO 2 powder, added to an aqueous solution consisting of 0.4 kg of bismuth nitrate and 0.15 kg of copper nitrate, adding ammonia water at a high speed to a pH value between 5.5 and 6.5 to form a precipitate of bismuth and copper ions in the form of hydroxide, and deposit the precipitate in a vacuum oven The obtained powder was ball-milled in a planetary ball mill for 15 minutes and then calcined in a high-temperature calciner. During calcination, it was kept at 250°C for 1 hour, at 560°C for 1 hour, and at 1100°C for 2 hours; others were the same as in Example 1.

[0068] The rivet processing performance test is carried out on wire products with a diameter of φ1.4. The rivet specification is F3.0×1.5 (0.3), the rivet cracking rate is less than 0.3%, and the pinching cracking rate is less than 1%, which shows that the rivet processing performance of the wire is better than the implementation example one.

[0069] The results of scanning electron microscope...

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Abstract

The invention discloses a spray atomization technology of a silver tin oxide (SnO2) material, which comprises the following steps: a powder adding step, a silver ingot smelting step, a spray initiation step, a spray atomization step, a powder shaping step, a powder sintering step and an extrusion material forming step. In addition to the pretreatment process of an SnO2 powder, the production cycle of each batch is only 3 to 4 days, and therefore, the capital turnover speed of the production process is obviously increased, and meanwhile, precious metals are not used as additives, and therefore, the production cost is obviously reduced. After the SnO2 powder used by the invention is pretreated, the beneficial additives are dissolved in the SnO2 powder in a solid state instead of a silver matrix, and thus, the wettability of the SnO2 powder and silver is well improved, and therefore, the uniform distribution of the SnO2 powder in the silver matrix can be ensured, and meanwhile, the electrical property of low-voltage apparatus can be ensured; the silver tin oxide (SnO2) material can be easily processed into wires and sheets, and simultaneously, the cracking phenomenon can not be generated when the wires are processed into rivets, and therefore, the yield is obviously increased. All production processes of the invention are friendly to the environment and do not generate the harmful three wastes.

Description

technical field [0001] The invention relates to a jet atomization technology of silver tin oxide material. Background technique [0002] Electrical contacts are the main conductive contact materials widely used in relays, contactors, load switches, medium and low voltage circuit breakers, household appliances, automotive appliances and other switching appliances. Switching appliances are widely used to break / close the voltage / current in the circuit, and its reliability directly affects the reliable operation of the entire system. At present, AgCdO electrical contact materials are widely used. This material has excellent comprehensive properties. However, due to the toxicity of cadmium and the development of low-voltage electrical appliances in the direction of miniaturization, long life, and high reliability, AgCdO materials are also exposed to poor welding resistance. Serious arc erosion and other shortcomings. Silver tin oxide material is an environmentally friendly elec...

Claims

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Application Information

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IPC IPC(8): C22C1/05B22F1/02B22F3/16B22F9/04H01H11/04
Inventor 刘远廷刘承峰石建化杨根涛
Owner NINGBO HANBO PRECIOUS METAL ALLOY
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