Cr2O3含量对玻璃熔体黏度和熔化特性的影响

为了保证玻璃液顺利浇注成型,并为高炉渣和铬铁合金渣协同制备CaO-MgO-Al₂O₃-SiO₂-Cr₂O₃体系建筑微晶玻璃提供基础的工艺技术参数,采用FactSage7.1热力学软件绘制CaO-MgO-Al₂O₃-SiO₂-Cr₂O₃玻璃体系的五元相图,并通过试验探究基础玻璃熔体的黏度和熔化特性。结果表明,在FactSage7.1绘制的相图中,随着Cr₂O₃含量的增加,相图的液相区范围不断缩小,表明玻璃的进一步熔化受到阻碍。晶核剂 Cr₂O₃的质量分数由0.85%增加到2.05%的过程中,玻璃熔体黏度逐渐减小,熔化性温度逐渐升高,在采用熔融法制备CaO-MgO-Al₂O₃-SiO₂-Cr₂O₃体系基础玻璃时应使熔融温度高于1 469 ℃。Cr₂O₃含量增加会使基础玻璃熔化温度升高,具体表现为各组试样的软化温度、半球温度和流动温度均不断升高,因此应尽量降低基础玻璃原料配比中Cr₂O₃的含量。

Effect of Cr2O3 Content on Viscosity and Melting Characteristics of Glass Melt

In order to ensure the smooth pouring of liquid glass, and to provide basic technical parameters for the co-preparation of CaO-MgO-Al₂O₃-SiO₂-Cr₂O₃ architectural glass-ceramics by blast furnace slag and chromium iron alloy slag, FactSage7.1 thermodynamic software was used to draw the five-element phase diagram of CaO-MgO-Al₂O₃-SiO₂-Cr₂O₃ glass system, and the viscosity and melting characteristics of the base glass melt were investigated through experiments. The results show that in the phase diagram drawn by FactSage7.1, with the increase of Cr₂O₃ content, the liquid phase region of the phase diagram is shrinking, indicating that the further melting of glass is hindered. When the mass fraction of nucleating agent Cr₂O₃ increases from 0.85% to 2.05%, the viscosity of glass melt decreases gradually and the melting temperature increases gradually, and the melting temperature should be higher than 1 469 ℃ when the CaO-MgO-Al₂O₃-SiO₂-Cr₂O₃ base glass is prepared by melting method. The increase of Cr₂O₃ content will increase the melting temperature of the base glass, which is reflected in the continuous increase of softening temperature, hemisphere temperature and flow temperature of each group of samples. Therefore, the content of Cr₂O₃ in the raw material ratio of base glass should be reduced as much as possible.