Thorium tungsten pin is a tungsten alloy composed of tungsten and thorium dioxide. The tungsten matrix of this alloy is doped with 0.7% to 2% ThO2. Due to the good thermal stability of the doped ThO2, the high-temperature strength, recrystallization temperature and high-temperature creep performance of the tungsten alloy can be greatly improved, and thorium can further improve Reduce the electron escape work function of tungsten, thereby enhancing the hot electron emission capability of tungsten-thorium alloy.
Tungsten-thorium alloy tungsten needles are widely used in electron tubes as filaments and cathodes with high thermal electron emission, and tungsten-thorium alloy rods are used as electrode materials for various arc welding, cutting and arc ignition. However, it should be noted that thorium dioxide contains certain radioactivity, so it will cause radioactive contamination during processing and use.
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