Abstract
La2Sn2O7 has high melting point and excellent thermal stability, which improves the wettability between matrix and reinforcement. In this study, La2Sn2O7 powder was synthesized by chemical coprecipitation method, and Ag-Ni-La2Sn2O7 composites were prepared by vacuum hot-pressing sintering. The effect of La2Sn2O7 content on the arc erosion behavior of Ag-Ni-La2Sn2O7 composites was studied. The Ag-Ni-La2Sn2O7 (85:12:3) composite has the lowest arc energy and the highest breakdown strength. With the increase of La2Sn2O7 content, the defects on the cathode surface decrease and the erosion areas become flat. After arc erosion, the samples generate Ag2O, NiO, La2O3 and SnO2. In this study, the mechanism of La2Sn2O7 to improve the anti-arc erosion capability of composites is mainly enhancing the viscosity of the molten pool by the ``pinning'' action, consuming energy by the decomposition of La2Sn2O7, and the promotion of arc movement.
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