BaO对铝酸盐熔渣微观结构和宏观性能的影响

为探究非反应性组分BaO对铝酸盐熔渣微观结构稳定性及宏观性能的影响机制,综合半球点熔点仪、旋转黏度计、四探针法电导率测定仪、红外光谱分析仪,研究了BaO对铝酸盐熔渣(w(CaO)/w(Al₂O₃)=1.3)熔化温度、黏度、电导率和结构的影响规律。结果表明,随着BaO质量分数增加,BaO会简化铝酸盐熔渣微观网络结构,使铝酸盐熔渣结构聚合度降低;由于试验组分范围内熔渣熔化温度变化很小,可说明过热度对熔渣黏度影响不大,即熔渣黏度降低主要受聚合度降低影响;由于Ba2+浓度增加及熔渣网络结构聚合度降低,熔渣电导率增加。此外,随着BaO含量的增加,黏度-温度曲线上转折温度递减,说明BaO提高了熔渣低温段的玻璃特性,因此,BaO有利于铝酸盐基保护渣润滑特性的改善。

Effect of BaO on microstructure and properties of aluminate slag

In order to explore the influence mechanism of the non-reactive component BaO on the microstructure stability and macroscopic properties of aluminate slag, the influence of BaO on the melting temperature, viscosity, electrical conductivity and microstructure of aluminate slag (w(CaO)/w(Al₂O₃)=1.3) was studied by combining hemisphere melting temperature test, rotating viscometer, conductivity tester with four-electrode technique and infrared spectrum experiment. The results show that, with the increase of BaO content, BaO simplifies the microstructure network structure of aluminate slag, and the degree of polymerization of the aluminate slag structure decreases. Because the melting temperature of the slag changes very little within the composition range of this test, it shows that the degree of superheat has little effect on the viscosity of the slag, that is, the viscosity of the slag is mainly affected by the degree of polymerization. Due to the increase of the Ba2+ cation concentration and the decrease of the polymerization degree of the slag network structure, the conductivity of slag increases. In addition, with the increase of BaO content, the breaking temperature on the viscositie-temperature curve decreases, indicating that BaO improves the glass properties of the slag at low temperature. Therefore, BaO is beneficial to the improvement of the lubricating properties of aluminate-based mold slag.