Abstract
CuW–La2O3 composites were fabricated using an in-situ synthesis. The breakdown voltage in vacuum, moving trajectory of cathode spots, electrical conductivity, and hardness of CuW–La2O3 composites were carefully examined. The microstructures were characterized by a scanning electron microscope (SEM). The results show that CuW–La2O3 composites have the maximum hardness of 220HB and the electrical conductivity of 45% IACS when the content of La2O3 is 0.75wt.%. In comparison with CuW alloy, the dielectric strength, arc life and the arc mobility of the CuW–La2O3 composites increased by 36.9%, 9.7% and 46.6%, respectively. As a result, the addition of La2O3 is useful to improve the properties of CuW alloys and the in situ synthesized CuW–La2O3 composites should have excellent arc erosion resistance.
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