Non-sag Tungsten Wire Diameter Consistency

Non-sag tungsten wire diameter incandescent bulb poor consistency is an important reason to make the optical parameters of the ultra-poor, and some will affect the life of the lamp. Apply a small amount of tungsten in addition to high-temperature furnace used for heating materials, tubes of the heater and the composite stiffener endures, most of them for the production of incandescent lamps and tungsten halogen lamps and gas discharge lamp filament electrodes. For use as a gas discharge lamp cathode tungsten or tungsten rods, in order to reduce the electron work function, should be 0.5 to 3% of thorium, called thorium tungsten filament. Because Thorium is a radioactive element, pollute the environment, instead of useful cerium thorium wire made of tungsten or tungsten cerium rod. But the evaporation rate of cerium, the gas tungsten or tungsten filament cerium rod can be used for small-power discharge lamp. Once tungsten by high temperature recrystallization becomes very brittle, in case of a shock or vibration can easily break. In some of the requirements of high reliability electric light source products in order to prevent filament breakage, often joined in the anti-sag tungsten wire 3 to 5% of rhenium, called tungsten-rhenium wire, which can make the extension of tungsten brittle transition temperature drops to room temperature or below. This is a very strange effect of rhenium, has not yet been able to find a substitute element rhenium, tungsten produce the same effect. Tungsten at room temperature have good acid and alkali capacity, but in the humid air easily oxidized, so fine tungsten wire can not be stored for too long in a humid environment. Also tungsten at 1200 ℃ and down to begin with the carbon from the reaction of tungsten carbide, so the filament to burn hydrogen treatment should pay attention to this issue, tungsten or graphite lubricant react with the surface, the filament would become brittle fracture.

 

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