Melting Properties and Viscosity of SiO2‐CaO‐Al2O3‐B2O3 System
Melting Properties and Viscosity of SiO2‐CaO‐Al2O3‐B2O3 System
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DOI：
10.1002/srin.201400353
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发表时间：
2015-06
影响因子：
2.2
通讯作者：
Lin Wang;Ya-ru Cui;Jian Yang;Chen Zhang;D. Cai;Jianqiang Zhang;Y. Sasaki;O. Ostrovski
中科院分区：
文献类型：
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作者：
Lin Wang;Ya-ru Cui;Jian Yang;Chen Zhang;D. Cai;Jianqiang Zhang;Y. Sasaki;O. Ostrovski
本文研究了CaO/SiO2质量比为0.83 ~ 1.5、B2O3含量为5 ~ 9 wt%时SiO2 - CaO - Al2O3 - B2O3助熔剂的熔炼性能和粘度。用热级显微法研究了这些助熔剂的熔融性能；粘度测量采用旋转圆筒法。根据熔剂冷却过程中粘度随温度的变化，确定了熔剂的断裂温度。利用FactSage计算平衡液相温度。CaO/SiO2比的增加会降低半球温度和粘度。B2O3的加入对助熔剂的半球温度没有显著影响，但降低了助熔剂的粘度。分析了粘度与熔剂结构的关系。随着CaO/SiO2比的增加，助熔剂聚合的程度降低，B2O3在低浓度B2O3条件下明显表现出弱网络改性剂的作用。实验黏度与修正NPL模型计算黏度吻合较好。
This paper investigated melting properties and viscosity of SiO2‐CaO‐Al2O3‐B2O3 fluxes with a mass ratio of CaO/SiO2 from 0.83 to 1.5 and B2O3 content from 5 to 9 wt%. Melting properties of these fluxes were studied using the hot stage microscopy method; viscosity was measured using the rotating cylinder method. Break temperature was also determined from the viscosity change with temperature in flux cooling process. Equilibrium liquidus temperature was calculated using FactSage. Increase in CaO/SiO2 ratio was found to decrease hemispherical temperature and viscosity. The addition of B2O3 did not significantly affect hemispherical temperature but decreased the flux viscosity. Viscosity was analyzed in relation to the flux structure. The increase of the CaO/SiO2 ratio reduced the degree of flux polymerization, and B2O3 apparently acted as a weak network modifier under the low concentration of B2O3. The experimental viscosity was in a good agreement with calculated viscosity using the modified NPL model.