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 morpholo

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

Example Embodiment

[0036] Example 1

[0037] Weigh 4.240 kg of SnO 2 Powder, 0.505 kg Bi 2 O 3 Powder, 0.255 kg CuO powder, 5 kg oxide powder in total, ball milled in a planetary ball mill and mixed for 60 minutes, the mixed SnO 2 The powder is calcined in a high-temperature calcining furnace. During calcining, it is kept at 100°C for 0.5 hours, 520°C for 0.5 hours, and 1100°C for 2 hours. Composite SnO after calcination 2 The powder is wet-milled in a stirred ball mill for 2 hours. The grinding medium used in wet-milling is 3 mm ZrO 2 Ball, SnO 2 The ratio of powder to water is 0.5, and the ratio of ball to powder is 3.0. SnO after wet grinding 2 SnO detection with laser particle size analyzer 2 The particle size of the powder should ensure that the D50 is between 1.5 and 2.5 microns and the D90 is between 2.5 and 5 microns. The particles larger than 10 microns should be less than 3%. Dry the wet-milled SnO in a vacuum oven 2 powder.

[0038] Accurately weigh 3 kg of treated SnO 2 Dry powder, add 2...

Example Embodiment

[0044] Example 2

[0045] Weigh 4.49 kilograms of tin ingots, 0.408 kilograms of indium ingots, and 0.102 kilograms of antimony ingots, smelt and pour into tin flowers at low temperature in an intermediate frequency furnace, put the tin flowers in 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, and react for 2 hours, then heat the metastannic acid slurry after the reaction for deacidification treatment, add ammonia water for precipitation after cooling, adjust the PH value to 7.5-9, and then treat it well The metastannic acid slurry is filtered, cleaned and vacuum dried.

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

[0047] Scanning electron microscopy analysis of the cross-section of the wire product shows that SnO 2 The parti...

Example Embodiment

[0050] Example 3

[0051] Weigh 4.5 kg of SnO 2 The powder is added to an aqueous solution composed of 0.35 kg of indium nitrate and 0.15 kg of bismuth nitrate, and ammonia is added to a high-speed pH value between 5.0 and 6.5 to precipitate bismuth and indium ions in the form of hydroxides. The precipitate is filtered and cleaned. After vacuum drying, the obtained powder is calcined in a high-temperature calcining furnace. During calcining, 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 the same as in Example 1.

[0052] The diameter is 1.9 wire products do rivet processing performance testing, rivet specifications The rivet cracking rate is less than 0.1%, and the flattening 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 of the cross-section of the wire product shows that the SnO2 par...

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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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