研究了Ni基高温合金用CaO坩埚真空感应精炼过程中含S量的变化;发现只用CaO坩埚并不进行脱S.通过熔体化学成分变化研究了加Al的脱S作用;结合坩埚壁的XRD分析和成分分析数据讨论了CaO坩埚脱S机理;对CaO坩埚内壁表面发生的化学反应进行了热力学计算和讨论
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