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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.

Negative thermo element:

The negative thermo element for the  W3RE/W25RE combination have a nominal composition of 75 % tungsten and 25 % rhenium.
The negative thermo element for the  W5RE/W26RE combination have a nominal composition of 74 % tungsten and 26 % rhenium.

Diameter: 0.1-1.1mm

Common Uses: Due to its excellent physical properties, our high-performance Tungsten Rhenium wire could be used as resistance wire in special fields,cathode filament,ion source wire and surgical probe used in medical field

Tips of Tungsten Rhenium Wire Use:

·  The positive pole is either WRe3 or WRe5; the negative pole is either WRe25 or WRe26

·  Temperature point: When the cold junction temperature is at 0, the temperature of the hot junction is at 10010001200140016002000; the EMF value of the φ0.1mm wire is calibrated at the Palladium(Pd) melting point, let q(Pd)=1554,we use purity Platinum melting point to calibrate theφ0.1mm wire in a form test, let q(Pt)=1769.

·  Uniformity: the non-uniform electromotive force of the single pole thermocouple wire, from head to heel, should ≤±40 mv at 1200.

·  Ductility: After stable anneal, the thermocouple wire can wrap itself six circles without cleavage.

·  Supply condition: the thermocouple wire is supplied after stable anneal, its silvery white color.

·  Hot junction weld: Make the positive and negative pole of the wire in order, use forceps to nip the wire and heating upon an alcohol burner. After twisting 3-5 circles, use an argon arc to weld into a ball shape.

·  The W/Re thermocouple bare wire can be used for a long time only in vacuum argon and inert atmosphere; it can not be used in the oxidizing atmosphere for a long time except it is insulated from the air by a shield or heat resistant protection tube.

·  WRe3-WRe25 thermocouple should match with its special compensating cable type WC3. There are four kinds of cable, such as bare wire plastic covered rubber covered and metal shielded wire.

·  WRe3-WRe25 thermocouple should match with the Type D calibration indicator to monitor the temperature. Now in China there are more than ten factories making many types of the indicator.

·  Outer protection tube for the φ0.5mm W/Re thermocouple wire

·  Storage of the W/Re thermocouple wire: the wire should be packed in a waterproof and damp-proof bag. For long time storage, it should be put in a dry vacuum glass jar which has silica dryer in it.