Investigation on Fusion Bridge of Au Electrical Contacts Material under Different Voltage

[摘要] The fusion bridge phenomenon caused by Au contacts was investigated with the high speed vedio-electrical contact testing system built by ourselves. The microscopic topography of Au contacts surface was observed after the survey of fusion bridge size. The results in this paper revealed some novel phenomena and rules. The size of fusion bridges which generated during electrical contact process of Au contacts is micron scale when the load is DC 10 A (6 V to 15 V); The shape of fusion bridges has three types which are the cylindrical, dumbbell and frustum; With the increase of the voltage, the size of the diameter exhibit the characteristic of S type, and the change in length also has such a rule; the molten bridge behaviour can erode the Au contact surface and present the erosion surface with the characteristics of the molten pool, spray particles and convex hill, the droplet spray is the main form of the loss of Au contact material in the process of electrical contact.

[发布机构] Department of Materials Science and Engineering, Kunming Institute of Precious Metals, No. 988 science and technology road, Kunming, Yunnan, China^1

[效力级别] 材料科学

[关键词] Contact material;Contact surface;Different voltages;Droplet sprays;Electrical contacts;Erosion surfaces;Micron scale;Spray particles