Obtained and characterization of composite materials W-Cu for electrical contact
Keywords:Electrical contacts, W-Cu composite materials, Powder metallurgy, Cu-Ag alloys
In the Cuban Metallurgical Research Center (CIME), are manufactured by powder metallurgy, shims of adjustment of a W-Cu composite material, that are used in the electrical contacts of the panels of control of the portico derricks that operate in the port of Havana City. The base material used has a composition of 70 % in mass electrolytic copper powder and wolfram powder of (30 %) that is obtained by reduction from the oxide from wolfram. The powders are submitted to the stages of mixed, pressed and agglomeration and is obtained a composite material with free particles of W occluded in a counterfoil of Cu matrix, that do not interact and they provide the following properties: high melting temperature, high electro and thermo conductivity and corrosion resistance, high mechanical and electrical strengtheners, decrease weldability and stability during their development. However, when not reacting the volframio particles with the copper, the compound material will begin to fuse to the temperature of the copper, on the other hand and for the same reason the resistance to the corrosion should be similar to that of the pure copper. The shims of adjustment are fixed to the bodies of high purity copper welding with a silver alloy, the one which provides the maximum qualities of the Cu, as elasticity, breaking strength, thermal and electrical conductivities, as well corrosion resistance.
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