Analysis The Microstructures And Properties Of CuW Alloy Under The Action Of Arc/force

The Cu W alloy widely used to be the high voltage circuit breaker with the form of Cu W/Cu Cr integrated electrical contacts, because it had good ablation performance. The Cu W alloy with the merits of the quality would determine the service life of high voltage circuit breaker and the operation of the power system safe and reliable.As the high voltage switch contactor material, its failure was often associated with a number of factors,expect the environmental corrosion.The dynamic and static contacts were opened or closed with the arc ablation and hot extrusion deformation, It would seriously influence the normal working of the circuit breaker. So it was very important to analysis the microstructures and properties of Cu W alloy under the action of arc/pressure.In this paper,The organization performance changing of Cu W alloy which was the failure dynamic and static contact materials after the type test was researched,It mainly analyzed the macro at tungsten copper parts of failure contacts,as well as its density、hardness、electrical conductivity and microstructure of the surface of the copper tungsten in different parts.The folloing showed the results.(1)From the macro analysis, The ablation on the surface of dynamic and static contacts as very serious with the crack and scaling-off.Because contact materials were melted、transfered、splashed and gasified.The physical properties of Cu W alloy which was Failure static contact were analyzed.The physical properties of Cu W alloy at different places of failure part had different degrees of lower compared with the parts which were not failure.And electrical conductivity decreased significantly, the hardness and density changed little.(2)It found that Cu W alloy had convex shape microstructure 、 hole shape microstructure 、 pit shape microstructure and terrazzo microstructure with analysis microstructure of the static contact Cu W alloy on the surface of the part of the end. The composition of Cu W alloy surface varied at different places,mainly was composed with Cu element、S element and W element because of the transfer of materials in the arc heat and the reaction of SF6 gas.To research of inner surface and end of tungsten copper parts on dynamic contact,It would be found in Cu W alloy,such as crack shape microstructure、drop shape microstructure 、 loose hole shape microstructure and pit shape microstructure.Compared with the end surface of static contact,The composition of Cu W alloy had much F elements. The reason was mainly related to the action under arc and material transfer.Because the temperature field which the micro area of dynamic and staticcontact surface located in was different,Its ablation was different.During the hot compressive deformation experiment at different temperature and different strain rate,It would be analyzed under the action of pressure, That was the changing in the structure property of Cu W alloy and tungsten skeleton. Found the experimental results as below.(1)Tungsten skeleton crushed under the deformation of 60%,The physical properties of Cu W alloy had a different degree of reducing expect density at thermal compression experiment under the different condition,and density was higher a little.(2)To analyze the scanning figure of tungsten skeleton fracture microscopic,it was found that tungsten particles connected closely and pore distributed unevenly,also found that tungsten skeleton structure was destroyed seriously.The ungsten skeleton under higher strain rate would destroy more seriously with the same compression experiment temperature.(3)The composition of Cu W alloy distributed unevenly with copper enrichment after finisning the hot compression experiment, and it would be more obvious at higher experiment temperature. The temperature was the main influence factors of Cu W alloy at the hot compression experiment, Because the strain of high temperature and pressure maked the stable structure of tungsten skeleton destroyed,and causing the deterioration of alloy organization performance.