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Tungsten Applications - Electrical Applications
time2019/01/09
Tungsten Applications - Electrical Applications
Properties
Tungsten is practically the only material used for electron emitters. Although other, more electropositive,
metals would yield higher emission rates, the advantage of tungsten is its extremely low vapour pressure
even at high temperatures.This property is also important for electrical contact materials. While more
conductive metals like copper or silver evaporate under the conditions of an electric arc, tungsten withstands
these.
The following list illustrates some of the resulting tungsten applications:
• Directly heated cathodes or heater coils for indirectly heated cathodes in cathode ray tubes for TV
sets or computer displays, X-ray tubes, electron tubes, klystrons, magnetrons for microwave ovens;
• Thoria or rare earth oxide alloyed rod electrodes for inert gas welding , as well as High Intensity
Discharge lamps;
• Tungsten disks for substrate of high power semiconductor rectifying devices;
• Sintered pure tungsten electrical contacts
• Sintered tungsten-copper or tungsten-silver electrical contacts for high-voltage breakers
• Infiltrated tungsten-copper or tungsten-silver contacts, made from very coarse (50-150 µm) tungsten
metal powder
• High temperature furnace parts such as tungsten heating coils, reflectors and structural material
• Tungsten / tungsten-rhenium thermocouples for measuring the temperature in such furnaces
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