Effect Of Fibrous CuO Structure On Mechanical And Electrical Contact Properties Of AgCuO Electrical Contact Material

Silver copper oxide (AgCuO) composite is a new kind of environmental protection electrical contact material, electrical resistivity was significantly lower than AgSnO2 composite, Because of its good stability, good wettability, low price and rich raw materials, the development and application of AgCuO electrical contact material has become a hotspot.Silver copper oxide composites were prepared by the in-situ synthesized method. The samples were conducted by hot extrusion process at the high temperature. Through these two processes, the AgCuO composite material containing fibrous CuO was successfully prepared. Studies have shown that there is a certain relationship between the mechanical properties, electrical properties and fibrous CuO microstructure of AgCuO composites prepared by this experiment.In mechanical properties, this experiment tested the hardness, tensile strength, percentage elongation of AgCuO composite. It was found that the change of the micro hardness of AgCuO composites was basically consistent with that of the percentage of fiber CuO content. Fibrous CuO high tissue content of the specimen, its tensile strength is also high, and the long diameter ratio of fiber CuO has a significant effect on the tensile strength of AgCuO composites. Especially for the more dense fibrous tissue specimens, its tensile strength is excellent compared with other samples. Elongation also shows that the feature is closely related with the fibrous tissue of CuO.In the aspect of electrical contact performance, this paper focuses on the AgCuO contact resistance and anti welding properties, material transfer characteristics. The results show that under the condition of low voltage, high content of fibrous tissue specimens, the contact resistance has little fluctuation. And the anti welding performance of this samples equally outstanding performance. When the current is less than 10A, the samples only have the material transfer, and does not produce the quality loss. However, when the current is higher than 20A, the test contact has a larger loss, It turned out that the content of the fiber CuO structure effect on the material transferring only occurs in the current range of 10A-20A.In the arc erosion morphology features, under the condition of low voltage, contact anodes show a clear pit, and the cathode surface appeared in the crater morphology, also cathode contacts and the anode contact surface appeared paste like spikes. In addition, it was found that the contact with high content of fibrous CuO was found to be a small diameter of the pits formed after the erosion of the anode.This study provides a reference for the realization of low cost and large-scale production of AgCuO electrical contact materials, and expands the research field of AgCuO electrical contact material, which has a certain significance and value for accelerating the application of AgCuO materials.