The influence of La₂O₃ on the properties and structure of calcium-silicate-based mold flux for continuous casting La-bearing FeCrAl alloy was studied through employing rotating viscometer, SEM-EDS, XRD, and Raman spectroscopy. The results showed that the viscosity of mold fluxes decreased with the increase of La₂O₃ content from 0 mass% to 15 mass%. The apparent activation energy for viscous flow decreased from 108.56 ± 1.96 kJ/mol to 87.29 ± 7.29 kJ/mol with increasing La₂O₃. Deconvolution Raman analysis showed that with increasing La₂O₃, the mole fraction of Q³ units decreased, while that of Q⁰, Q¹, and Q² units increased. Furthermore, the values of NBO/Si increased from 1.27 to 1.83 with the increase of La₂O₃, which indicated that the degree of polymerization of melt structure was reduced and lead to the decrease of viscosity. During the cooling process, cuspidine (Ca₄F₂Si₂O₇) was the main crystalline phase in calcium-silicate-based mold fluxes. Nevertheless, when La₂O₃ was excessively added, a new phase of CaLa₂(SiO₄)₂ was formed owing to the charge balance of Ca²⁺ and La³⁺ on the simple structural units Q⁰ ([SiO₄]⁴⁻). Therefore, with increasing La₂O₃ can increase the break temperature and accelerate the formation of crystalline phases Ca₄F₂Si₂O₇ and CaLa₂(SiO₄)₂ at high temperature.

采用旋转粘度计、SEM-EDS、XRD和拉曼光谱研究了La ₂ O ₃对连铸含La FeCrAl合金硅酸钙基保护渣性能和结构的影响。结果表明，随着La ₂ O ₃含量从0质量%增加到15质量% ，保护渣的粘度降低。随着 La ₂ O _{3 的}增加，粘性流的表观活化能从 108.56 ± 1.96 kJ/mol 降低到 87.29 ± 7.29 kJ/mol 。解卷积拉曼分析表明，随着La ₂ O _{3 的}增加，Q ³单元的摩尔分数降低，而Q⁰、 Q ¹和 Q ²单位增加。此外，随着La ₂ O ₃的增加，NBO/Si的值从1.27增加到1.83 ，这表明熔体结构的聚合度降低，导致粘度降低。在冷却过程中，cuspidine (Ca ₄ F ₂ Si ₂ O ₇ ) 是硅酸钙基保护渣中的主要结晶相。然而，当过量添加La ₂ O ₃时，由于 Ca ²⁺的电荷平衡，形成了新的 CaLa ₂ (SiO ₄ ) ₂相以及简单结构单元Q ⁰ ([SiO ₄ ] ^4- )上的La ³⁺。因此，随着La ₂ O _{3 的}增加，可以提高断裂温度，加速高温下Ca ₄ F ₂ Si ₂ O ₇和CaLa ₂ (SiO ₄ ) ₂晶相的形成。