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Nano silver-tin oxide electric contact and its prepn

A technology of nano-tin oxide and tin oxide, applied in the direction of contact materials, metal/alloy conductors, etc., can solve the problems of temperature rise, difficulty in drawing, and large contact resistance, etc., achieve simple processing technology and improve thermal stability properties and effects of arc corrosion resistance and oxidation resistance

Inactive Publication Date: 2005-03-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silver tin oxide contact is currently a research hotspot in the domestic low-voltage electrical industry. However, because it is not easy to be drawn into shape, the contact resistance is relatively large during use, and the temperature rises, which has become a research difficulty.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) SnCl 4 and TiCl 4 , according to the weight ratio: 8:2 ratio, take SnCl 4 20 g TiCl 4 Weigh 5 grams, put it into a beaker, add 20ml of 30% ethanol aqueous solution, add 0.5g of triethanolamine dispersant and dropwise 40ml of ammonia water with a concentration of (1mol) to the solution, react at 40-60°C, and react to the solution The pH value is 7, the product is filtered and calcined at 200-700° C. for 2-3 hours to obtain 8 grams of titanium oxide-doped nano-tin oxide powder with a particle size of 20 nm.

[0016] (2) Silver powder, nano-tin oxide and cerium oxide powder are weighed in a weight ratio of 88:10:2, weigh 88 grams of silver powder, 10 grams of nano-tin oxide and 2 grams of cerium oxide, and mix 7 to 10 grams in a mixing tank. Hour. The mixed powder is molded under pressure at 250MPa at a temperature of 20-30°C, and sintered at 800°C for 10 hours.

[0017] (3) Extrude the sintered material at 700°C with an extrusion ratio of 200; obtain a wire rod...

Embodiment 2

[0020] 1) SnCl 4 and TiCl 4 , according to the weight ratio: 9:1 scale SnCl 4 27 g and TiCl 4 , 3 grams, put into a beaker, add concentration is 30% ethanol aqueous solution 30ml, add 0.7 gram triethanolamine dispersant and dropwise concentration to solution simultaneously and be (1mol) ammoniacal liquor 40mL, react at 40~60 ℃, react until solution is pH=7, the product is filtered and calcined at 200-700° C. for 2-3 hours to obtain 10 grams of titanium oxide-doped nano-tin oxide powder with a particle size of 20 nm.

[0021] (4) Mix silver powder, nano-tin oxide and cerium oxide powder in a weight ratio of 88:10:2, 44 grams of silver powder, 5 grams of nano-tin oxide and 1 gram of cerium oxide powder in a mixing tank for 7 to 10 hours . The mixed powder is molded under pressure at 250MPa at a temperature of 20-30°C, and sintered at 800°C for 10 hours.

[0022] (5) Extrude the sintered material at 700°C with an extrusion ratio of 200; obtain a wire rod of Φ3.5-5.0 mm, and...

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PUM

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Abstract

The present invention belongs to metal-based composite material technology. The electric contact material consists of Ag 70-97 wt%, nanometer tin oxide 3-22 wt% and RE elements 0.1-8 wt%. The electric contact is produced through the processes of preparation of zine oxide or titanium oxide doped nanometer tin oxide, mixing metal oxide powder, pressing the mixture to form, sintering, extruding, drawing wire and forming into rivet type or stripe contact. The pressure in pressing the mixture to form is 150-400 MPa and the sintering temperature is 800-900 deg.c. The electric contact can be used in electric appliance, instrument and switch.

Description

technical field [0001] The invention relates to an electrical contact of silver nano tin oxide and a preparation method thereof. The invention belongs to the technical field of metal matrix composite materials. Background technique [0002] Electrical contacts are key components of electrical switches, instruments, etc., in contactors, relays and small power circuit breakers. For a long time, Ag-CdO contacts have been widely used at home and abroad. It has the advantages of good arc extinguishing performance and stable contact resistance. It is exposed that its anti-melting performance is poor, the arc burns seriously, and cadmium poisoning is unavoidable in the use process, causing environmental pollution and other deficiencies. Silver tin oxide contact material is a new type of non-toxic electrical contact material that has developed rapidly in recent years. It has good thermal stability, arc erosion resistance and welding resistance, and its application range can reach ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C5/06H01B1/02H01H1/02
Inventor 郑冀高后秀李松林李玉桐李群英
Owner TIANJIN UNIV
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