Tungsten Rhenium Resistance Wire, Brand Name : GT

description:

tungsten rhenium wire is tungsten rhenium alloy wire, made by metal rhenium powder and tungsten powder. Through production processes. Such as forging etc. With powder metallurgy technology.tungsten rhenium wire are mainly used for the production of dual tungsten rhenium wire, electrode of high-performance lamp, electrodes of laser and cathode of electron tube etc.

the wires is solid, round, smooth and be free of weld joints, slivers, kinks, pits or nicks exceeding 5 % of diameter . Tungsten rhenium wire surface is uniformly clean and free of discoloration. The thermo elements is heat treated to provide the specified ductility

tungsten rhenium wire is used for heating elements in high temperature furnaces, thermocouples and in electronics. Its advantage is its ability to maintain greater ductility compared to tungsten after exposure to extremely high temperatures. Tungsten wire has fiber structure, when the temperature reaches 1500-1600℃, the tungsten filament would turn, and cause high-temperature sag. To improve the quality of tungsten wire, it is always mixed some additives during sintering procession, such as na2o, k2o, sio2, tho to enhance the capacity of high-temperature creep resistance and high temperature anti-sag of tungsten wire. In order to improve the tenacity of tungsten wire and prevent the deformation under high temperature, it usually added some oxides, such as silica, alumina, potassium and so on.

tungsten rhenium wire is the most common material used to produce heaters for dispenser cathodes. Performance variation may be attributable to a range of factors, including cold work and rhenium content variation

specification:

tungsten rhenium wire main specifications are : w-re1%，w-re3%，w-re5%，w-20%re,w-25%rw-26%re.

positive thermo element:

the positive thermo element  for the w3re/w25re combination have a nominal composition of 97 % tungsten and 3 % rhenium.
the positive thermo element  for the w5re/w26re combination have a nominal composition of 95 % tungsten and 5 % rhenium.
the positive thermo element is doped by the addition of potassium, silicon, and aluminum compounds or otherwise, stabilized by the addition of volatile substances that promote desirable grain structure and workability and maintain ductility after high temperature use.