Behavior of Rare Earth Metal Oxides during Arcing(Physics, Process, Instrument & Measurement)

概要

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This work was carried out on one standard electrode (W-Tho_2) and other electrodes developed by additions of La_2O_3, CeO_2 and Y_2O_3. Their behavior during arcing was analysed qualitatively after arcing in pure argon at 200 A for several time intervales, also after furnace heated ones for W-La_2O_3 and W-Tho_2 electrodes. The present results have indicated that the superiority on arc characteristics strongly depends on the behavior of the rare earth metal oxides during arcing. It was observed that the rare earth metal oxides forming, tungstate or oxy-tungstate during arcing while ThO_2 react with tungsten forming pure Th. The differences between the melting points, migration and vaporization rates and feeding rates of these oxides and its reaction products with tungsten have much influences on the stability of these oxides during arcing. Therefore, electrodes activated with La_2O_3 (2%) showed good arc characteristics related to the stability of La_2O_3 during arcing comparing with other oxides.
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