Method for preparing Ag-SnO2-doped electrical contact material

A technology of electrical contact materials, silver tin oxide, applied in circuits, electrical switches, electrical components, etc., can solve problems such as contact resistance and excessive temperature rise

Active Publication Date: 2010-05-12
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SnO 2 Particle modification method, the poor conductor SnO 2 Particles improve SnO by doping 2 The conductive properties of the particles, and then the modified SnO 2 Particles as raw material to prepare Ag-SnO 2 materials, so as to improve the problem of high contact resistance and temperature rise of materials during use

Method used

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  • Method for preparing Ag-SnO2-doped electrical contact material
  • Method for preparing Ag-SnO2-doped electrical contact material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Take the corresponding SbCl at a mass ratio of 5:100 3 with SnCl 4 .5H 2 O, respectively dissolved in isopropanol and mixed.

[0031] 2. The mixed liquid was refluxed at 75°C and then centrifuged to remove the white precipitate to obtain the supernatant.

[0032] 3. Use ammonia water to drip into the clear liquid at 50°C, adjust the pH to between 2 and 3, and obtain milky yellow colloid.

[0033] 4. Dry the milky yellow colloid at 120°C for 4 hours and then dry at 600°C for 2 hours to obtain modified SnO 2 powder.

[0034] 5. Take modified SnO 2 powder and silver powder ball milling, wherein modified SnO 2 The powder accounted for 18% of the total weight, the ball-to-material ratio was 3:1, and the ball milling time was 20 hours.

[0035] 6. Then the ball-milled powder is pressed into a billet under an isostatic pressure of 300 MPa.

[0036] 7. Sinter the pressed green body at 900° C. for 4 hours in an air atmosphere.

[0037] 8. Hot press the sintered green...

Embodiment 2

[0042] 1. Take the corresponding SbCl at a mass ratio of 6:100 3 with SnCl 4 .5H 2 O, respectively dissolved in isopropanol and mixed.

[0043] 2. The mixed liquid was refluxed at 78°C and then centrifuged to remove the white precipitate to obtain the supernatant.

[0044] 3. Use ammonia water to drip into the clear liquid at 60°C, adjust the pH to between 2 and 3, and obtain milky yellow colloid.

[0045] 4. Dry the milky yellow colloid at 120°C for 4 hours and then dry at 600°C for 2 hours to obtain modified SnO 2 powder.

[0046] 5. Take modified SnO 2 powder and silver powder ball milling, in which modified SnO 2 The powder accounts for 4% of the total weight, the ball-to-material ratio is 10:1, and the ball milling time is 20 hours.

[0047] 6. Then the ball-milled powder is pressed into a billet under isostatic pressure of 100MPa.

[0048] 7. Sinter the pressed green body at 700°C for 8 hours in an air atmosphere.

[0049] 8. Hot press the sintered green body at...

Embodiment 3

[0054] 1. Take the corresponding SbCl at a mass ratio of 7:100 3 with SnCl 4 .5H 2 O, respectively dissolved in isopropanol and mixed.

[0055] 2. The mixed liquid was refluxed at 80°C and then centrifuged to remove the white precipitate to obtain the supernatant.

[0056] 3. Use ammonia water to drip into the clear liquid at 70°C, adjust the pH to between 2 and 3, and obtain milky yellow colloid.

[0057] 4. Dry the milky yellow colloid at 120°C for 4 hours and then dry at 600°C for 2 hours to obtain modified SnO 2 powder.

[0058] 5. Take modified SnO 2 powder and silver powder ball milling, in which modified SnO 2 The powder accounts for 10% of the total weight, the ball-to-material ratio is 5:1, and the ball milling time is 6 hours.

[0059] 6. Then the ball-milled powder is pressed into a billet under isostatic pressure of 250MPa.

[0060] 7. Sinter the pressed green body at 800° C. for 6 hours in an oxygen atmosphere.

[0061] 8. Hot press the sintered green bod...

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Abstract

The invention discloses a method for preparing an Ag-SnO2-doped electrical contact material, comprising the following steps: obtaining modified SnO2 particles by adopting a sol-gel method, improving the electrical conductivity of the SnO2 particles, and then preparing a dispersed composite material with compact distribution from modified SnO2 used as raw material and Ag powder by the process flow of ball milling, pressing, sintering, hot extrusion and the like. Since the electrical conductivity of the SnO2 particles is improved, the problem that contact resistance and overhigh temperature rise of the material in the use process can be solved, thereby widening the use range of the Ag-SnO2 material and improving the electrical contact performance of the material.

Description

technical field [0001] The invention relates to a preparation method of an electrical contact material, in particular to a preparation method of a silver-doped tin oxide electrical contact material. The silver contacts made of this alloy material include electrical contacts used in various relays and contactor switches, bimetal composite rivet electrical contacts, sheets, etc. Background technique [0002] With the development of electrical products in the direction of large capacity and small volume, the requirements for electrical contact materials are increasing --- the materials are required not to undergo welding, mechanical and electrical wear resistance under conditions of extreme arc heat and Joule heat It is good; less metal spatter is generated during the breaking process, and the arcing time is short; in a DC environment, it has good welding resistance, less material transfer, and low and stable contact resistance. [0003] Although silver and cadmium oxide elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H11/04B22F3/16C22C1/05
Inventor 甘可可陈乐生祁更新陈晓
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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