Abstract: Low fluorine CaF2-CaO-Al2O3-MgO-SiO2 slag system was used as refining slag for preparation of Cu-Cr alloy. Its viscosity, density, surface tension and melting temperature were studied. The results indicated that the melting temperature of the slag was between 1336~1402℃. The density and surface tension of CaF2-CaO-Al2O3-MgO-SiO2 slag decreased with increasing of temperature, adding of CaF2 and MgO could decrease its density and surface tension. Its viscosity decreased with increasing of MgO and CaF2 content, and achieved the minimum value when MgO content was 6%, and increased when MgO content up to 9% with 10% and 15% CaF2 content. The slag had lower surface tension and better fluidity, so the refining efficiency with it was very good.

Key words: Cu-Cr alloy, electroslag remelting, slag, viscosity, density, surface tension

摘要： 设计了精炼铜-铬合金用低氟CaF2-CaO-Al2O3-MgO-SiO2五元渣系，并研究了其粘度、密度、表面张力及熔化温度等性能. 结果表明，该渣系的熔化温度在1336~1402℃之间；高温下该渣系的密度和表面张力均随温度升高而减小，且随CaF2含量和MgO含量增加逐渐降低；增加CaF2添加量可降低渣系粘度；CaF2含量较低时，MgO含量增加也可降低渣系粘度，CaF2含量较高时，渣粘度在MgO含量为6%时最小，MgO含量续增加到9%时粘度反而上升. 该渣系粘度较低，表面张力较小，具有良好的精炼效果.

关键词: 铜-铬合金, 电渣重熔, 熔渣, 粘度, 密度, 表面张力