Abstract:Silver copper oxide composites were prepared by the in-situ synthesized method. The relationship between the number of tests and the contact resistance under different conditions of DC arc were studied by a contact resistance parameter tester. The sample surface morphology changes were analyzed by scanning electron microscopy (SEM). The results show that the contact resistance of AgCuO electrical contact material presents an elevated trend in the early time, then decreases at a certain number of test times and reaches a saturation value at last. In the experiment, the contact resistance of AgCuO electrical contact material decreases as the test current increases. When the current reaches 25 A, the contact resistance of AgCuO electrical contact materials exhibits the lowest value, and with the increase in the number of tests, the contact resistance changes a little, the material exhibits excellent stability in contact resistance. By analyzing the contact morphology features after arc erosion, it is found that there are obvious differences between the anode and the cathode contact surface morphology, the surface of the anode showing a concave convex shape with some cracks and pores and the cathode contact surface showing paste peak.