AgCdO materials have excellent resistance to arc erosion, fusion welding and low contact resistance,
Widely used in microswitches, relays, contactors, circuit breakers and other low-voltage electrical appliances, its use of current levels from a few amps to thousands of amps, known as universal contact.However, there is cadmium pollution in the production, application and recycling process of AgCdO materials, which directly endangers human health. Therefore, research on alternative cadmium contact materials has been carried out in many countries around the world.AgSnO2 has good arc wear resistance and fusion welding resistance among all kinds of pan contact materials
The preparation of AgSnO2 contact materials mainly includes alloy oxidation and powder metallurgy.At present, domestic processes of preparing AgSnO2 contact materials by powder metallurgy include: Mechanical mixing of AgSnO2 powder, atomization preparation of AgSn alloy powder pre-oxidation, coprecipitation, high-energy ball grinding preparation of prepared AgSn02 powder, reaction synthesis, chemical coating, etc.Among these powder metallurgy methods, the AgSn alloy powder pre-oxidation method prepared by atomization has the advantages of high production efficiency, no waste water and waste gas discharge, easy to add various trace elements and so on, which has been widely used.However, during the oxidation process of AgSn alloy powder, it is easy to form a dense SnO2 layer on the surface of the alloy powder, which prevents the formation of dense SnO2 layer.The continuous diffusion of atoms into AgSn alloy powder results in incomplete oxidation of AgSn alloy powder, which cannot be achieved even after the addition of trace elements (also known as oxygen AIDS) to the AgSn alloy powder during the oxidation process.
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