Oxidation Parameters of Ag-Sn-In Alloy Powders

Ag-(9.7-x/10)Sn-xln (x=0, 0.5, 1.0, 1.5, 2.0, wt%) alloy powders were prepared by atomization. Within the Ag-Sn-In alloy powders were oxidized in air. The results show that the oxidation rate of the samples of x = 0.5 is always lower than that of the samples with x = 0, indicating trace In addition cannot increase the oxidation rate, instead it inhibits the oxidation. The oxidation rate of the samples with x = 1.0, 1.5, 2.0 varies oddly. When the temperature is below 700 degrees C, their oxidation rate is obviously higher than that of the samples with x = 0; however, when the oxidizing temperature and holding time reach certain values, the oxidation rate of samples with x = 0 becomes higher. It is shown that at low temperature oxidizing for short time, In addition (x =1.0, 1.5, 2.0) is beneficial for oxidation reaction, but at high temperature oxidation for a long time, the effect of the In addition is slight, and it even decreases the oxidation reaction. According to the comprehensive test, we conclude that the reasonable oxidizing temperature is 750 degrees C for various samples to obtain a better oxidation rate.