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Silver composite tin oxide contact material and its preparation technology

A composite tin oxide and contact material technology, which is applied in the field of silver composite tin oxide contact material and its preparation technology, can solve problems such as unsatisfactory process methods, achieve good welding resistance and arc erosion resistance, improve Combined state, processability and electrical properties improvement effect

Active Publication Date: 2006-09-13
桂林金格电工电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In summary, although it is known that bismuth Bi oxide in silver tin oxide contact materials 2 o 3 with tin oxide SnO 2 Combined i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]Put 2 kilograms of tin, 3.6 kilograms of bismuth and 44.4 kilograms of silver, that is, the metal raw materials whose weight percentage is 4% tin, 7.03% bismuth, and the balance is silver, are put into an intermediate frequency induction furnace, heated and melted to form a molten alloy liquid, and atomized with high-pressure water to form 2 ~150μm alloy powder. The alloy powder is placed in an oxidation furnace at 550°C and oxidized under oxygen-enriched conditions for 4 hours, and the oxidized alloy powder is placed in an air furnace for calcination at 800°C for 3 hours. The powder obtained before and after calcination is subjected to X-ray diffraction analysis, wherein the powder before calcination has tin oxide SnO 2 and bismuth oxide Bi 2 o 3 Diffraction peaks, indicating that there is tin oxide SnO 2 and bismuth oxide Bi 2 o 3 exists; and the calcined powder only has bismuth stannate Bi 2 sn 2 o 7 Diffraction peaks without bismuth oxide Bi 2 o 3 Diffracti...

Embodiment 2

[0022] 6 kilograms of tin, 5 kilograms of bismuth, 0.3 kilograms of titanium and zinc, and 38.7 kilograms of silver, that is, the weight percentage of various metals is 12% tin, 10% bismuth, 0.6% titanium and zinc, and the balance is silver. Liquid, silver-tin-bismuth molten alloy liquid is atomized into 2-150 μm alloy powder with a high-speed rotating disk at 10,000 rpm. The alloy powder was placed in an oxidation furnace at 750°C and oxidized under oxygen-enriched conditions for 5 hours, and the oxidized alloy powder was placed in an air furnace for calcination at 820°C for 7 hours. The powder obtained after calcination is subjected to X-ray diffraction analysis, and bismuth stannate Bi 2 sn 2 o 7 and tin oxide SnO 2 Diffraction peaks, indicating no bismuth oxide Bi 2 o 3 Existence, using chemical analysis of bismuth stannate Bi 2 sn 2 o 7 The content is 18.36wt%. The calcined silver composite tin oxide powder is formed, sintered and extruded to obtain a plate or wi...

Embodiment 3

[0024] Heat and melt 2 kilograms of tin, 0.25 kilograms of bismuth, 0.5 kilograms of copper and cobalt, and 47.25 kilograms of silver, that is, the weight percentage of various metals is 4% tin, 0.5% bismuth, 1.0% copper and cobalt, and the balance is silver into molten alloy liquid, high-pressure water atomization into 2 ~ 150μm alloy powder. The alloy powder was placed in an oxidation furnace at 650°C and oxidized under oxygen-enriched conditions for 2 hours, and the oxidized alloy powder was then placed in an air furnace at 940°C for calcination for 0.5 hour. The powder obtained before and after calcination is subjected to X-ray diffraction analysis, wherein the powder before calcination has tin oxide SnO 2 and bismuth oxide Bi 2 o 3 Diffraction peaks, indicating that there is tin oxide SnO 2 and bismuth oxide Bi 2 o 3 exists, and the calcined powder has bismuth stannate Bi 2 sn 2 o 7 and tin oxide SnO 2 Diffraction peaks of bismuth oxide-free Bi 2 o 3 Existence,...

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Abstract

A composite Ag-tin oxide material used as contact is proportionally prepared from tin oxide, bismuth stannate, the oxides of one or two metals chosen from Ni, Ti, Mn, Co, Fe, Cu and Zn, and Ag through proportional smelting, atomizing to become powder, oxidizing, calcining, shaping, sintering and extruding to obtain contact.

Description

(1) Technical field [0001] The invention relates to the field of silver oxide contact materials, in particular to a silver composite tin oxide contact material and a preparation process thereof. (2) Technical background [0002] Silver oxide contact material is the main electrical contact material. For a long time, silver oxide contacts used at home and abroad are mostly silver cadmium oxide. However, silver cadmium oxide inevitably causes cadmium pollution in the process of production and use, and Europe has banned silver cadmium oxide contact materials within a time limit. Silver tin oxide is one of the non-toxic electrical contact materials with excellent performance to replace silver cadmium oxide. It has developed rapidly in recent years and is widely used in low-voltage electrical appliances such as relays, contactors, and circuit breakers. Due to the good thermal stability of tin oxide, silver tin oxide contacts have the advantages of good resistance to arc erosion a...

Claims

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Application Information

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IPC IPC(8): B22F1/00
Inventor 刘辉覃向忠
Owner 桂林金格电工电子材料科技有限公司
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