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<p>The viscosity of the CaO–MgO–Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> system containing La<sub>2</sub>O<sub>3</sub> and Fe<sub>2</sub>O<sub>3</sub> was measured by rotation, hot-stage microscopy and hot-stage load methods to investigate the rheological behavior across multiple temperature ranges. <i>In-situ</i> high temperature Raman spectroscopy was employed to quantitatively analyze the microstructure. The results show that with the La<sub>2</sub>O<sub>3</sub>/Fe<sub>2</sub>O<sub>3</sub> ratio varying from 2/0 to 0/2, the viscosity decreases gradually through the multiple temperature ranges, and the viscous flow activation energy also gradually decreases. As the ratio of La<sub>2</sub>O<sub>3</sub>/Fe<sub>2</sub>O<sub>3</sub> decreases, the relative contents of <i>Q</i><sup>0</sup>, <i>Q</i><sup>1</sup> and <i>Q</i><sup>2</sup> increase gradually, and the relative contents of <i>Q</i><sup>3</sup> and <i>Q</i><sup>4</sup> decrease significantly. This indicates that both La<sub>2</sub>O<sub>3</sub> and Fe<sub>2</sub>O<sub>3</sub> act as network modifiers and simplify the glass network structure, resulting in a decrease in the degree of network polymerization and viscosity over the multiple temperature range. Compared to La<sub>2</sub>O<sub>3</sub>, Fe<sub>2</sub>O<sub>3</sub> is a more effective network modifier, as it breaks up the silicate network more efficiently and results in a lower overall viscosity. In addition, the microstructure of the melts was quantitatively analyzed by NBO/<i>T</i>, and a quantified relationship among viscosity, microstructure and temperature was given.</p>

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Effect of La2O3/Fe2O3 Ratios on the Rheology and Microstructure of CaO–MgO–Al2O3–SiO2 System Over Multiple Temperature Ranges

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Zhuoqing An,
  • Weiwen Liang,
  • Yuan Gao,
  • Jiajing Chen

摘要

The viscosity of the CaO–MgO–Al2O3–SiO2 system containing La2O3 and Fe2O3 was measured by rotation, hot-stage microscopy and hot-stage load methods to investigate the rheological behavior across multiple temperature ranges. In-situ high temperature Raman spectroscopy was employed to quantitatively analyze the microstructure. The results show that with the La2O3/Fe2O3 ratio varying from 2/0 to 0/2, the viscosity decreases gradually through the multiple temperature ranges, and the viscous flow activation energy also gradually decreases. As the ratio of La2O3/Fe2O3 decreases, the relative contents of Q0, Q1 and Q2 increase gradually, and the relative contents of Q3 and Q4 decrease significantly. This indicates that both La2O3 and Fe2O3 act as network modifiers and simplify the glass network structure, resulting in a decrease in the degree of network polymerization and viscosity over the multiple temperature range. Compared to La2O3, Fe2O3 is a more effective network modifier, as it breaks up the silicate network more efficiently and results in a lower overall viscosity. In addition, the microstructure of the melts was quantitatively analyzed by NBO/T, and a quantified relationship among viscosity, microstructure and temperature was given.