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Grain refinement technology of silver-nickel electrical contact material and grain refinement technology of silver tin oxide electrical contact material

An electrical contact material, grain refinement technology, applied in the direction of contacts, circuits, electrical switches, etc., can solve the problems of poor compactness, difficult processing, low material strength, etc. Various properties, obvious effect of grain refinement

Active Publication Date: 2011-03-02
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Documents (8) and (11) respectively use chemical plating to dope TiO2 and rare earth elements to achieve grain refinement and coat tin oxide particles in silver-ammonia solution. These two methods belong to chemical methods, so The prepared material has low strength and poor compactness; literature (9) adopts the atomization method to prepare the material, and the method has different oxidation states, the material exhibits different characteristics, and is difficult to process

Method used

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  • Grain refinement technology of silver-nickel electrical contact material and grain refinement technology of silver tin oxide electrical contact material

Examples

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Embodiment 1

[0044] Example 1: Take the AgNi10 wire with a diameter of Ф0.6mm 3kg, the 0.6mm~2mm clean corner wire produced in the process 3kg, the wire diameter within the range of 2.0mm 9kg, cut with a shearing machine to approximately 1cm-5cm length The short wire is heat treated under a hydrogen atmosphere at a constant temperature of 550℃~600℃ for 1.5 hours to 2.0 hours, and compressed into a Ф80mm-spindle on a hydraulic press with a pressure of 25 MPa -30MP. The spindle is 550℃ under a hydrogen atmosphere. After heat treatment at a constant temperature of ~600℃ for 1.5 hours to 2.0 hours, the ingot is subjected to 2~3 upsetting treatments before extrusion, the first upsetting to 82mm, the second upsetting to 84mm, the third upsetting Thick to 85mm, in a hydrogen protective atmosphere, heat the spindle to 850℃, put the spindle into the extruded copper with a diameter of Ф90mm, heat extrude the wire with a diameter of Ф6mm (extrusion ratio is 225), and finally draw to Ф1.88mm specificat...

Embodiment 2

[0049] Example 2: Take AgSnO 2 (15) Wire diameter Wire diameter Ф0.6mm 3kg, 0.6mm~2mm clean corner material produced in the process 3kg, wire diameter within the range of 2.0mm 9kg, cut to approximately 1cm-5cm length with a shearing machine The short wire is heat treated at a constant temperature of 800℃~900℃ for 1.5 hours to 3.0 hours, and compressed into a Ф80mm spindle on a hydraulic press with a pressure of 25 MPa -30MP. The spindle is heat treated at a constant temperature of 800℃~900℃ for 1.5 hours. After hours to 3.0 hours, the spindle is subjected to 3 hot upsetting treatments before extrusion, the first upsetting to 82mm, the second upsetting to 84mm, and the third upsetting to 85mm. Under a hydrogen atmosphere, the spindle Heat to 850℃, put the spindle into extruded copper with a diameter of Ф90mm, heat extrude the wire with a diameter of Ф6mm (extrusion ratio is 225), and finally draw to Ф1.88mm to make the corresponding rivets specification.

[0050] The comparison ...

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Abstract

The invention discloses a grain refinement technology of a silver-nickel electrical contact material and a grain refinement technology of a silver tin oxide electrical contact material, belonging to the technical field of a metal-base composite material, which is characterized in that a uniform AgNi wire and a uniform AgSnO2 wire with a certain diameter specification are firstly drawn and thrust into short wires with the length of 1cm-5cm; the thrust wires are pressed into spindles after heat treatment; the spindles are made into the wire through sintering, upsetting and a plurality of hot extrusion, wherein, grain shearing deformation and grain refinement are realized by upsetting before extrusion, so tissue components in an extrusion material (110) are effectively reduced and oxide films on the boundary of powder grains are crushed and dispersed; and a plurality times of extrusion are adopted for extrusion deformation under large hydrostatic pressure, which is beneficial to elimination of tiny holes and combination of material points of the material so that the density and the shaping of the product are enhanced. In the course of extrusion, grain refinement is more obvious, the gross area of the grain boundary is increased, the capability for blocking crack expansion is enhanced, and the concentration of impurities on the grain boundary is reduced, thus avoiding brittle fracture along the grain boundary.

Description

Technical field [0001] The invention relates to a method for preparing an electrical contact material, and belongs to the technical field of metal matrix composite materials. Background technique [0002] AgNi and AgSnO 2 Electrical contact materials are mainly used in electrical switches such as relays, contactors, motors, switches, etc. The two materials are currently the most commonly used environmental protection materials in low-voltage electrical appliances, and can be mass-produced. With the development of the miniaturization of relays, there are also newer requirements for the resistance to welding of contact materials. The existing AgNi composite material is made of traditional silver-nickel mixed powder, which has the defect of instability of electrical properties caused by coarse nickel particles. All recent studies are mainly refined by chemical methods such as co-deposition and coating methods. Particles, or adding additives to improve its electrical properties. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/14H01H1/023
Inventor 颜小芳柏小平翁桅陈海森
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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