Cadmium Chlorophosphate Phosphors

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Abstract
In arc‐melting zirconium metal with a tungsten electrode, tungsten appears in non‐uniform amounts throughout the ingot. To eliminate this, the use of consumable electrodes of zirconium sponge is proposed. All early attempts to use sponge zirconium electrodes were unsuccessful due to instability of the arc. This problem was solved by stabilizing the arc with a small amount of magnesium metal added to the zirconium sponge used in making up the electrodes. A water‐cooled copper sleeve was used as a melting section in the arc‐melting furnace. Melting was done under an inert atmosphere of argon or helium. Metallographic and radiographie studies show the finished ingots to be sound.

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