Preparation technology of silver composite tin oxide contact material
A technology of composite tin oxide and contact materials, which is applied in the field of preparation technology of silver composite tin oxide contact materials, can solve problems such as unsatisfactory process methods, achieve good welding resistance and arc erosion resistance, and improve the bonding state , the effect of low dynamic contact resistance
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Embodiment 1
[0019] 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 to be heated and melted to form a molten alloy liquid, which is atomized by high-pressure water into 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 Dif...
Embodiment 2
[0021] 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
[0023] 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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