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A kind of preparation method of composite silver tin oxide electrical contact material

An electrical contact material, silver tin oxide technology, used in contacts, circuits, electrical switches, etc., to achieve the effects of easy penetration, reduced oxidation paths, and improved electrical performance

Active Publication Date: 2015-12-09
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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  • A kind of preparation method of composite silver tin oxide electrical contact material
  • A kind of preparation method of composite silver tin oxide electrical contact material
  • A kind of preparation method of composite silver tin oxide electrical contact material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 22.596 kilograms of silver ingots, 1.968 kilograms of Sn ingots, 0.336 kilograms of Bi ingots, and 0.100 kilograms of Cu ingots, a total of 25 kilograms of raw materials are melted and alloyed in an intermediate frequency melting furnace. The water is atomized into alloy powder under the pressure of the nozzle, the powder is dried at 200°C for 24 hours, sieved on a 200-mesh sieve to remove the oversize, and the particle size of the undersize powder is detected by a laser particle size analyzer to ensure that the particle size of the powder is less than 80 microns. The powder extraction rate is 80-90%.

[0037] The -200 mesh alloy powder was pre-oxidized in an oven, and the pre-oxidation was kept at 300°C for 2 hours, at 400°C for 2 hours, and at 500°C for 2 hours.

[0038] Pour the pre-oxidized powder into a controlled atmosphere rotary oxidation furnace for oxidation. The inclination angle of the rotary furnace is 15°, the compressed air flow rate is 5 liters per...

Embodiment 2

[0044] Weigh 22.596 kilograms of silver ingots, 1.968 kilograms of Sn ingots, 0.336 kilograms of Bi ingots, and 0.100 kilograms of Cu ingots, a total of 25 kilograms of raw materials are melted and alloyed in an intermediate frequency melting furnace. The alloy powder is gas-atomized under the pressure of the nozzle, and the powder is dried at 200°C for 24 hours, sieved on a 200-mesh sieve to remove the oversize, and the particle size of the undersize powder is detected by a laser particle size analyzer to ensure that the particle size of the powder is less than 80 microns. The powder extraction rate is 85-95%. Others are with embodiment 1.

[0045] The results of scanning electron microscope analysis of the cross-section of the wire product show that SnO 2 The particle size is between 0.2-0.5 microns, and no SnO2 particles larger than 1.2 microns are seen. The EDX scanning of the components of tin, indium and nickel shows that the added elements are evenly distributed in the...

Embodiment 3

[0049] Pour the pre-oxidized powder into a controlled atmosphere rotary oxidation furnace for oxidation. The inclination angle of the rotary furnace is 0°, the compressed air flow rate is 20 liters per minute, and the rotary furnace rotates in a unidirectional manner with a rotation speed of 60 rpm. / min, keep warm at 620°C for 2 hours, 680°C for 2 hours, and 770°C for 5 hours. Others are the same as embodiment 1.

[0050] The metallographic observation of the wire products was carried out at 100 to 1000 times the cross-section and the longitudinal section respectively. Both the low-magnification and high-magnification observation results showed that SnO 2 The particles are evenly distributed in the silver matrix. Ten different parts of the wire product were sampled for chemical composition analysis, and the average silver content was 87.99%, with a relative standard deviation of 0.50%, indicating that the composition of the product was uniform.

[0051] The results of scann...

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Abstract

The invention provides a preparation method of a composite AgSnO electric contact material. The method comprises the steps of Sn and adding elements adding, atomizing into alloy powder, sieving, rotationally oxidizing powder in controlled atmosphere, and obtaining the composite AgSnO electric contact material. The method is controllable and environmental-friendly, the process is relatively simple, the product cost is relatively low, and the method is suitable for preparing the AgSnO electric contact material with finer grain size tin oxide particles, and can ensure that the tin oxide particles and the related additives are uniformly distributed in a silver matrix.

Description

technical field [0001] The invention relates to a preparation method of a metal alloy material, in particular to a preparation method of a composite silver tin oxide electrical contact material. 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 pressure and the breaking force drop significantly. At the same time, due to the difficulty in heat dissipation caused by miniaturization, the contact pressure and breaking force A large decrease and a large increase in the temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C32/00C22C5/06C22C1/10C22C1/05H01H1/0237
Inventor 石建华刘远廷潘宇王圣明
Owner NINGBO HANBO PRECIOUS METAL ALLOY
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