エア・プラズマアーク切断用Ir-Y₂O₃系焼結型電極の開発

酸化性雰囲気用プラズマアーク電極の開発研究(第5報)

抄録

This paper describes on the new developed Iridium(Ir) -Yttrium oxide (Y₂O₃) electrode for plasma cutting torch using compressed air in operating gas.
From the two type consumption tests, the continuous operation and the periodic operation at 25 A in air, Ir-Y₂O₃ sytem showed extremely low consumption in the range from 10 to 25 wt% in Y₂O₃ content for 3.6 ks at 25 A in arcing. And Ir-Y₂O₃ system showed the same erosion characteristic of dependency on Y₂O₃ content in metal as Ru-Y₂O₃ system. Especially, Ir including 15 wt% Y₂O₃ electrode showed the same durability as 85Ru-15Y₂O₃ electrode, and showed a good erosion resistance compared with Hf electrode.