Introduction of Non-sag Tungsten Wire

Non-sag tungsten wire, namely doped tungsten wire, which is widely used in electronic devices and hot wire, such as, high wire color temperature, thermal shock resistance wire and the cathode tube radiation. Its development could date back to 1920. Its large elongated grains are obtained by primary and secondary recrystallization, which are regarded as the desired microstructure to gain necessary creep resistance.

Non-sag tungsten wire of incandescent bulb is usually used at the temperature of 2600 ℃around, and the bulb requires the wire to ensure that it owns stable organization and unique high temperature resistance performance. The value of doped tungsten wire anti-sag resistance is an important parameter to evaluate high-temperature performance of tungsten wire. In recent years, studies have been continuing to report about the physical state of doped tungsten microstructure, and bubble reinforcement theory now is widely used to study high-temperature properties of tungsten wire. Long-term creep at high temperature conditions, required the gas atoms of strengthening effect must be insoluble, and has a sufficient vapor pressure, while the element content must be small, so as to ensure the formation of a dispersed state. In doped tungsten wire manufacturing process, aluminum and silicon in aluminum - silicon - potassium dopant, substantially soluble in the matrix, but there are large differences in potassium and tungsten atomic radius, potassium with greater atomic radius diffusion capacity in tungsten is bad. However, the tungsten in the processing and recovery temperature ranges, the vapor pressure of elements potassium is large, so can guarantee a solid solution in tungsten.

 

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