Has long been considered the best AgCdO electrical contact materials due to a Cd pollution, some countries and regions have a decree banning the production and use. Development has the environmental effect and new contact materials with good electric contact properties become research focus in the field, including AgSnO2 is currently the most promising alternative materials. Based on the contact material prepared by high energy ball milling method, on the basis of selecting several kinds of metal oxide additives, studied on AgSnO2 machinery, the influence of physical properties and mechanism of action; At the same time with reference to relevant national standard design assemble the contactor material dynamic performance testing machine, this equipment combined with microscopic analysis test, studies the influence of additives on the material dynamic properties.
The results show that the method of high-energy ball mill can effectively refine Ag and SnO2 particles, mixing, organization and composition distribution evenly AgSnO2 electricity contact materials; Choose several kinds of metal oxide additives are infiltrating improvement function to a certain extent, among them the most significant effect of Cu0 and Co203, Bi203, C1203 times: the experiment proved that the best content of Meo type additive is 0.5%, can effectively improve the material mechanical properties and physical properties, at the same time using the electrical conductivity of conductive model predicts the AgSnO2 materials. Through dynamic opening and closing test found that 100000 times Cr203, Co203 and Bi20, reduces the contact between the poles to varying degrees of material transfer and reduce the corrosion area, according to the effect of the order from high to low respectively Cr20, > Co20, > Bi203 and Cr20 > Bi20, > Co203: Co203 significantly reduce the temperature rise of AgSnO2 contact material Cr203 make can make arc caused by centralized type into spreading; The experiment proves, AgSnO2 - Bi2Q, suitable for low current (< 1 a) load and AgSnO2 contact materials - Co203 is suitable for high current > 2 a) load.
