Rare Earth Tungsten Electrodes and Metal Halide

Metal halide is kind of discharge lamp, and it can produce arc in the mixed steam of mercury and rare metal halide. Besides, it is a daylight colour new energy-saving light source. Metal halide having a high luminous efficiency, good color, long life and other advantages, is widely as indoor lighting used in stadiums, exhibition centers, shopping malls, industrial buildings, streets and squares, railway stations, docks and other places

Tungsten electrode is usually as electrode material used in metal halide lamp, having a certain impact on the performance of metal halide. So to produce high quality tungsten electrodes in favor of extend metal halide lamps’ application and prolong its service life. Earlier, people often used pure tungsten electrode and thorium tungsten electrode as tungsten material in metal halide, but thorium tungsten electrode has radioaction and pure tungsten electrodes has poor performance, so many manufacturers began to study different rare earth tungsten electrodes’ performance in the metal halide.

To further study metal halide’s electrode materials found using liquid-solid mixing method for raw materials mixing, and then using the powder metallurgy method to obtain tungsten billet, finally after swaging, annealing, straightening and other processes can produce excellent performance electrode material. Observing the performance of different rare earth tungsten electrodes used in metal halide discovery found, yttrium and cerium tungsten electrode color temperature, luminous flux and luminous efficiency is low. But thorium tungsten electrode and dysprosium tungsten electrode has higher color temperature and, luminous flux and luminous efficiency. Among them, lanthanum tungsten has minimum color rendering index, and dysprosium tungsten has highest color rendering index. Comparison the application effect of different rare earth in metal halide found dysprosium tungsten electrode and dysprosium yttrium tungsten electrodes has similar lighting parameters with thorium tungsten electrode. In addition, the starting, splash and corrosion resistance performance of dysprosium tungsten and yttrium dysprosium tungsten electrodes can reach a similar level to thorium tungsten electrode.

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