Abstract
The oxidation behavior of Ag–5.08Sn–3.15Sb and Ag–6.84Sn–1.25Sb alloy powders was investigated in air at 800 °C. The thermal gravimetric analysis (TGA) results confirmed that the starting oxidation temperature of Ag–5.08Sn–3.15Sb and Ag–6.84Sn–1.25Sb alloy powders was 670 and 720 °C, respectively. The oxidation kinetic results suggested that the oxidation behavior of Ag–Sn–Sb alloy followed a parabolic rate and the oxidation rate of Ag–5.08Sn–3.15Sb alloy powders was 3.2 times larger than that of Ag–6.84Sn–1.25Sb alloy powders. XRD results indicated that the formed Sb2O3 would react with the Ag matrix forming AgSbO3. SEM–EDS observations indicated that the formed oxides were primarily distributed on the grain boundaries and the formed AgSbO3 particles nailed into the SnO2 particles. In addition, the oxidation mechanism of Ag–Sn–Sb alloy powders and the effect of Sb on oxidation behavior of Ag–Sn alloy powders were also discussed.
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