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Composite silver stannic oxide electric contact material and preparation method thereof

An electrical contact material, silver tin oxide technology, used in contacts, circuits, electrical switches, etc., to shorten the production cycle, improve electrical contact performance, and diversify selection and addition methods.

Inactive Publication Date: 2013-01-09
NINGBO HANBO PRECIOUS METAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to add ammonia water to complex the silver ions in order to ensure the morphology of metallic silver when it is reduced and precipitated to ensure uniformity. a lot of pressure

Method used

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  • Composite silver stannic oxide electric contact material and preparation method thereof
  • Composite silver stannic oxide electric contact material and preparation method thereof
  • Composite silver stannic oxide electric contact material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 4.240 kg of SnO 2 Powder, 0.505 kg Bi 2 o 3 powder, 0.255 kg of CuO powder, a total of 5 kg of oxide powder, ball milled in a planetary ball mill and mixed for 60 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 composite SnO 2 The powder was wet milled in a stirring ball mill for 2 hours, and the grinding medium used in the wet milling was 3 mm ZrO 2 Ball, 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 The particle size of the powder should ensure that D50 is 1.5-2.5 microns, D90 is 2.5-5 microns, and the particles larger than 10 microns should be less than 3%. Dry the wet-milled SnO in a vacuum oven 2 pink.

[0038] Accurately weigh 3 kg of treated SnO 2 Dry powder, add 22 kg of 200-mesh aerosoli...

Embodiment 2

[0045] Weigh 4.49 kg of tin ingot, 0.408 kg of indium ingot, and 0.102 kg of antimony ingot, smelt and cast tin flower at low temperature in an intermediate frequency furnace, put the tin flower into a 50L stainless steel bucket, add 15L of 35% nitric acid, and stir while reacting After 1.5 hours, add 5L of 35% nitric acid, react for another 2 hours, then heat the metastannic acid slurry after the reaction for deacidification treatment, add ammonia water to precipitate after cooling, adjust the pH value to 7.5-9, and then process it The metastannic acid slurry was filtered, cleaned, and vacuum dried.

[0046] The above-mentioned dried powder is calcined in a high-temperature calciner. During the calcining, it is kept at 100° C. for 1 hour, at 500° C. for 0.5 hours, and at 950° C. for 2 hours. Others are with embodiment 1.

[0047] The results of scanning electron microscope analysis of the cross-section of the wire product show that SnO 2 The particle size is between 0.3-0.8...

Embodiment 3

[0051] Weigh 4.5 kg of SnO 2 powder, added to an aqueous solution composed of 0.35 kg of indium nitrate and 0.15 kg of bismuth nitrate, added ammonia water at a high speed to a pH value between 5.0 and 6.5 to form a precipitate of bismuth and indium ions in the form of hydroxide, and filter and clean the precipitate. Vacuum drying, the obtained powder is calcined in a high-temperature calciner. During calcination, it is kept at 100°C for 1 hour, at 250°C for 1 hour, at 560°C for 1 hour, and at 1050°C for 2 hours. Others are with embodiment 1.

[0052] for diameter 1.9 Wire products are tested for rivet processing performance, rivet specifications The rivet cracking rate is less than 0.1%, and the clamping cracking rate is less than 0.5%, indicating that the rivet processing performance of the wire is better than that of Example 1.

[0053] The scanning electron microscope analysis results of the cross-section of the wire product show that the SnO2 particle size is betwe...

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Abstract

The invention provides a composite silver stannic oxide electric contact material, which comprises 5-15wt% of SnO2 and the balance of silver. The material also contains additive which comprises the oxide of one or two types of elements, such as copper, tungsten, bismuth, indium, antimony and tellurium, and the total weight of the elements accounts for 0.1-3% of the gross weight. Meanwhile, the invention also provides a preparation method for the composite silver stannic oxide electric contact material. The controllable and environmentally-friendly preparation method for the composite silver stannic oxide electric contact material, which has the advantages of relatively simple technology and relatively low production cost, is suitable for preparing various silver stannic oxide contact materials of stannic oxide powder of different grain diameters, and the stannic oxide powder and various additives can be enabled to be evenly distributed in a silver matrix.

Description

technical field [0001] The invention relates to a method for preparing a metal alloy material, in particular to a composite silver tin oxide electrical contact material and a method for preparing it Background technique [0002] With the development of low-voltage electrical appliances in the direction of miniaturization, long life and high reliability, the main conductive contact materials used in relays, contactors, load switches, medium and low voltage circuit breakers, household appliances, automotive appliances and other switching appliances have also been proposed. higher and higher requirements. For example, in an electromagnetic relay, as the size of the enameled wire coil and the thickness of the moving reed decrease, both the closing contact force and the breaking force will drop significantly. Increase, it is easy to cause early welding and abnormal increase of electrical wear of the relay, which seriously affects the reliability of the relay. [0003] In low-vo...

Claims

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Application Information

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IPC IPC(8): C22C32/00C22C5/06C22C1/10C22C1/05H01H1/0237
Inventor 刘远廷王圣明刘承峰姚金秋潘宇
Owner NINGBO HANBO PRECIOUS METAL ALLOY
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