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Metal oxide blended silver-tin dioxide electric contactor material and its preparing method

A technology of electrical contact materials and tin dioxide, which is applied in the direction of contact materials, can solve the problems that affect the machinability of materials, the stability of electrical properties, the inability to meet the requirements of electrical contacts, and the complicated process of tin dioxide, etc., to achieve suitable The effect of industrial scale production, low cost, and strong interface binding force

Inactive Publication Date: 2003-06-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, internal oxidation plus indium method is mostly used to produce silver tin oxide contact materials at home and abroad; but there are problems such as high production cost, complicated process, productivity and yield rate, which are far from meeting the requirements of domestic electrical appliances and automobile markets for electrical contacts
In recent years, the use of powder metallurgy to manufacture silver-tin oxide contacts has been rapidly developed. However, looking at the current situation, the use of powder metallurgy to manufacture silver-tin oxide electrical contacts still has the following shortcomings: (1) The process is relatively complicated (2) Two The distribution of tin oxide powder is not uniform enough, which affects the machinability of the material and the stability of electrical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: (1) Titanium oxide is ground, sieved, mixed with tin dioxide powder, the ratio of tin dioxide and metal oxide is 98:6wt%, after diffusion and sintering at a high temperature of 1000°C for 10 hours, after grinding A composite powder doped with titanium oxide and tin dioxide is obtained. (2) Put doped tin dioxide powder into the silver ammine ion solution, then put 60ml triethanolamine / kg (Ag), stir for 20 minutes, add hydrazine hydrate solution and continue stirring to obtain silver-coated metal oxide The composite powder is washed with a pH of 7 and dried at 100°C to obtain a silver-coated powder. (3) Silver powder and coated doped tin dioxide powder were mixed in a ratio of 90:10 (wt%) for 6 hours, cold-pressed at 300MPa, sintered at 850°C for 3hr; hot extrusion (extrusion ratio was 200) ; Cold drawn to final dimensions; Rivets.

[0014] The wire density is 9.7-10.1kg / cm 3 , the resistivity is 2.1-2.6μΩ.cm,

[0015] The hardness is HB700-1100Mpa, the ten...

Embodiment 2

[0016] Embodiment two: (1) mix with zirconia, titanium oxide and tin dioxide powder, the ratio of tin dioxide, zirconium oxide, titanium oxide is 90: 4: 1wt% (weight ratio), through high temperature 1200 ℃, 6 hours Diffusion sintering and grinding to obtain doped tin dioxide composite powder. (2) Put the doped tin dioxide powder into the silver ammonia complex ion solution, add 40ml triethanolamine / kg (Ag) and stir for half an hour, add hydrazine hydrate solution and continue stirring, wash to pH=7, and dry to obtain the silver package Cover with powder. (3) Mix the silver powder and the coating-doped tin dioxide powder in a ratio of 90:10wt%, mix the powder for 6 hours, press compact (pressure 300Mpa), and sinter at 850°C for 3hr; hot extrusion (extrusion ratio is 200) ; Cold drawn to final dimensions; Rivets.

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Abstract

The present invention belongs to the preparation techonlogy of electric alloy material. The electric contactor material consists of Ag 85-90 wt%, SnO2 5-20 wt% and blended metal oxide 0.5-8 wt%. The blended metal oxide is ZrO2, ZnO, TiO2, MnO2, WO3 or Sb2O3. The electric contactor material is prepared through coating oxide through chemical plating with plating liquid with dispersant, mixing the coated pwoder and silver powder, pressing, sintering, hot extruding, cold drawing or cold rolling, and making rivet or punched product. The present invention has the features of homogeneous oxide dispersion, good fusion welding resistance, high arc corrosion resistance and less electric transfer. The production process is simple, practical, low in cost and suitable for large scale production.

Description

technical field [0001] The invention relates to an electrical contact material and a preparation process thereof. Background technique [0002] Electric contacts are the contact elements of electrical switches and instruments, and are the key materials of electrical appliances such as contactors and relays. They play the role of connecting, breaking and transmitting current. They are widely used in electric power, telecommunication systems and home appliance control machinery and other equipment. . At present, electrical contacts such as AgCdO and AgNi are widely used in various low-voltage electrical appliances at home and abroad. AgCdO has better comprehensive properties such as processing performance, contact resistance, and arc erosion resistance. Cadmium poisoning is inevitably produced during production and use, causing environmental pollution, and with the process of miniaturization, high reliability, and long life of low-voltage electri...

Claims

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Application Information

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IPC IPC(8): C22C5/06C22C32/00H01H1/02
Inventor 李玉桐李群英吕克泰郑冀赵乃勤张勇
Owner TIANJIN UNIV
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