Preparation method of silver-base electric contact material

An electric contact material, silver-based technology, applied in the direction of contacts, circuits, electric switches, etc., can solve the problems of low product density, high contact resistance, poor electrical performance, etc., to achieve increased densification, reduced resistance, Good for rearrangement and displacement effects

Inactive Publication Date: 2010-05-12
沈阳金纳新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fatal disadvantage of silver tin oxide materials is that the material contact resistance is relatively large and the temperature rise is relatively high; (see: Dide Jennot et al, Physical and Chemical Properties of Metal Oxide Additions to Ag-SnO 2 Contactmaterial and Predictions Electrical Performance [J], IEEE Trans on CPMT, Part A, 1994, 17(1): 17)
The product density is not high, which is one of the important reasons for the high contact resistance and poor electrical performance of the Ag contact material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Select silver powder made by No. 1 silver gas atomization, pass through a 150-mesh sieve, mix with 325-mesh WC powder, Ag:WC=60:40, after mixing in a ball mill, put the powder in a graphite mold with an inner diameter of 100mm, put In the vacuum hot pressing furnace, the high temperature and vacuum degree can reach 0.02 Pa, and the temperature is raised to 500 degrees for annealing for 5 hours, the temperature is raised to 850 degrees, hot pressed to dense, and the pressure is kept for 20 minutes, then the pressure is removed, sintered for 2 hours, and the furnace is cooled to At room temperature, the relative density of the hot-pressed silver and tungsten carbide alloy block is 99.8%; the resistivity is 3.7μΩ.cm.

Embodiment 2

[0020] Select silver powder made by No. 1 silver gas atomization, pass through a 150 mesh sieve, tin oxide is nano tin oxide powder, particle size 30-90nm, Ag:SnO 2 =90:10, after high-energy ball milling, the powder is placed in a graphite mold with an inner diameter of 100mm, and placed in a vacuum hot-press furnace, the high-temperature vacuum can reach 0.05Pa, the temperature is raised to 500 degrees for annealing for 1 hour, and the temperature is raised to 750 degrees. Hot-press until compact, keep the pressure for 20 minutes, remove the pressure, feed argon to 350Pa, heat up to 860°C, sinter for 2 hours, cool down to 750°C and re-press once, cool to room temperature with the furnace, test the hot-pressed silver oxidation The density of tin block is 10.02g / cm 3 ; Conductance is 54m / Ω.mm 2 ; After extrusion, wire drawing (including multiple annealing) to 1.86mm, the test density is 9.98g / cm 3 , the resistivity is 1.9124μΩ.cm, which is lower than the 2.1μΩ.cm required by ...

Embodiment 3

[0022] Select silver powder made by No. 1 silver gas atomization, pass through a 150 mesh sieve, tin oxide is tin oxide powder containing 7% copper oxide, particle size 100-200nm, Ag:SnO 2 =88:12, after high-energy ball milling, the powder is placed in a graphite mold with an inner diameter of 100mm, and placed in a vacuum hot-pressing furnace. Hot press until dense, remove the pressure, feed argon gas to 550Pa, heat up to 820°C, sinter for 2 hours, cool down to 750°C and repress once, then raise the temperature to 890°C, sinter for 2 hours, cool down to 750°C and re-press Repress once, cool down to normal temperature with the furnace, test the density of the hot-pressed silver tin oxide block is 9.88g / cm3; after extrusion, wire drawing (including multiple annealing) to 1.86mm, the test density is 9.89g / cm3, the resistivity It is 2.193μΩ.cm, which is lower than the 2.4μΩ.cm required by the national standard.

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Abstract

A method for preparing silver-based electric contact material includes carrying out degassing and annealing directly on mixed silver based powder under conditions as vacuum degree of 100-1 x 10-4 Pa,temperature of 200-800deg.c and time of 0-5 hour; making hot pressing densification on annealed powder under vacuum condition with temperature of 270-920deg.c, pressure of 10-300Mpa and holding time of 0-3 hour; sintering hot-pressed powder under vacuum condition with temperature of 600-980deg.c and time of 0-10 hour.

Description

technical field [0001] The invention relates to an electrical contact material, and in particular provides a preparation method of a silver-based electrical contact material. Background technique [0002] The pores and defects of silver-based electrical contacts have a very adverse effect on the resistance of electrical contacts to arc erosion. Pores weaken the mechanical strength of the molten layer of the contact, and are prone to cracks. Cracks are the most dangerous morphology of the contact. Once a large crack is formed, it may cause large pieces of material to fall off and cause the device to fail. Zhe, Electric Contact Theory, Beijing: Mechanical Industry Press, 2004: 119-120). In addition, the existence of pores reduces the density of electrical contacts and increases the resistance of the material, which will adversely affect the temperature rise of electrical contacts. [0003] Most of the silver-based electrical contact materials are produced by the powder cold ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H1/0237H01H1/0233
Inventor 李洪锡夏春明程陆凡张湃张国虎计硕
Owner 沈阳金纳新材料股份有限公司
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