Porous pseudoalloy electrode gap inserts
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The high thermal conductivity of the pseudoalloys compared with the pure refractory metals results, at the same porosity and with the same thermal fluxes, in a much lower internal EGI wall temperature. Porous EGIs made of W-Cu and Mo-Cu pseudoalloys are characterized by the same operating performance, as determined by the “sweating out” of copper. This enables their tungsten component to be replaced with the more readily available molybdenum. Chromizing stabilizes the hydraulic characteristics of porous W-Cu pseudoalloy EGIs operating with working gases containing up to 0.3 vol.% of oxygen and prolongs their useful life.
KeywordsOxygen Copper Porosity Thermal Conductivity Tungsten
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