在真空感应炉中熔炼合金时,往往由于氧化物坩埚向熔池供氧而影响冶金过程。过去国内外关于这个问题发表的工作都着重于坩埚材料本身的分解,而且只研究熔池形成以后的反应过程,对熔化过程中的坩埚供氧情况则未涉及。在本工作中用几种氧化镁坩埚在不同条件下熔炼纯镍。试验设备同前文。坩埚是预制的,在1560℃保温8小时烧成。坩埚A和B用电熔镁砂作原料,坩埚C用普通镁砂,坩埚D在电熔镁砂中加了8% Al_2O_3。新坩埚的显气孔率都在16—18%之间。每个坩埚在正式试验前都经过“洗炉”,即在真空下熔化两炉电解镍。 Melting the alloy in the vacuum induction furnace, often due to the oxide crucible oxygen supply to the molten pool affect the metallurgical process. In the past, the work published on this issue both at home and abroad focused on the decomposition of the crucible material itself, and only on the reaction process after the formation of the molten pool. The oxygen supply to the crucible in the melting process was not covered. In this work, several types of magnesia crucibles were used to smelt pure nickel under different conditions. Test equipment with the previous. The crucible was prefabricated and fired at 1560 ° C for 8 hours. Crucible A and B with fused magnesia as raw material, crucible C with ordinary magnesia, crucible D fused magnesia added 8% Al 2 O 3. The new porosity of the crucible are between 16-18%. Each crucible undergoes a “wash-out” before the formal test, ie melting of two electrolytes of nickel under vacuum.