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Restoring method for surface failure of failure AgSnO2 (silver-stannic oxide) contact material

A technology of contact material and repair method, which is applied in the field of surface repair of failed AgSnO2 contact materials, and achieves the effects of stable performance, simple operation, improved microhardness and wear resistance, etc.

Inactive Publication Date: 2015-03-11
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, no pulse laser has been used to treat AgSnO 2 Modification of contact material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Select Ag alloy powder, use liquid glue or acetate silicate binder, in AgSnO 2 A layer of Ag powder layer with a thickness of 40 μm is attached to the surface of the contact material; the dried alloy sample is mounted on the matching fixture, and the surface of the alloy is repaired by laser surface remelting. Install the sample on the matching fixture, put it into the YAG HWLW-600A pulse laser studio, then blow the protective gas argon to the place where the laser focuses, start the pulse laser equipment, and carry out electron beam surface remelting repair on the surface of the alloy deal with. AgSnO after remelting 2 The surface of the contact material has a thickness of about 200 μm, and the original agglomerated SnO 2 Under the remelting of the pulsed laser, the uniform dispersion is re-distributed, and the repair is realized. The main parameters of pulse laser surface strengthening treatment are: pulse energy 25J, pulse width 5 ns, scanning speed 15 mm / s, tilt ...

Embodiment 2

[0027] AgSnO deactivated in service by electrodeposition method using AgNO3 2 A sample with a thickness of 20 μm is prepared on the surface of the contact material. Install the sample on a special fixture, put it into the YAG HWLW-600A pulse laser studio, blow the protective gas argon to the laser focus place, start the pulse laser equipment, and carry out electron beam surface remelting repair treatment on the surface of the alloy . The main parameters of pulsed laser surface strengthening treatment are: pulse energy 20 J, pulse width 5 ns, scanning speed 20 mm / s, tilt angle 25°, defocus 5 mm. The repaired AgSnO 2 The surface is smoothed by machining to obtain the surface repaired AgSnO 2 contact material.

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PUM

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Abstract

The invention relates to a restoring method for surface failure of a failure AgSnO2 (silver-stannic oxide) contact material, and belongs to the technical field of material surface modification. After the AgSnO2 contact material is used and failed, the AgSnO2 contact material is mainly centralized on the 20-100mum part of the alloy surface, the content of Ag of the failure surface layer is reduced, the SnO2 (stannic oxide) agglomeration occurs, and the re-melting and restoration are performed by pulse laser. The 20-40mum pure Ag layer is coated on the failure contact material surface by a coating method or an electric depositing method or an immersing coating method, then argon is used as protective gas, the failure contact material surface is re-melted by pulse laser in a pulse laser working room, and finally the restored AgSnO2 surface is mechanically processed and flattened. The method has the advantages that the restored AgSnO2 contact material product has stable property, the operation is simple, the re-melting layer with small crystal grains is formed on the surface, the microhardness and abrasion-resistant property of the surface layer of the contact material are greatly improved, and the batched restoration is realized.

Description

technical field [0001] The invention relates to an invalid AgSnO 2 The process method of contact material surface repair, the method is to use pulsed laser on the failed AgSnO 2 A remelted layer with fine crystal grains is formed on the surface of a contact material, which belongs to the technical field of material surface treatment. [0002] Background technique [0003] AgCdO has been widely used as a contact material in medium and low-voltage electrical appliances for a long time due to its excellent electrical properties, but it is gradually replaced by other materials because it does not meet environmental protection requirements. AgSnO 2 is made of Ag and SnO 2 It is a metal matrix composite material made as the main component, and it is the preferred environmental protection contact material to replace the toxic AgCdO in low-voltage electrical appliances. At present, AgSnO2 contact material is mainly prepared by powder molding process. It mainly includes powder ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 周志明黄伟九黄灿罗天星刘杰肖红梅
Owner CHONGQING UNIV OF TECH