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Effect of Na2O on Properties, Structure, and Crystallization of CaO–Al2O3-Based Mold Fluxes
Steel Research International ( IF 1.9 ) Pub Date : 2021-05-15 , DOI: 10.1002/srin.202100193 Qi Wang 1 , Jian Yang 2 , Jianqiang Zhang 1 , Oleg Ostrovski 1 , Chen Zhang 3 , Dexiang Cai 3
Steel Research International ( IF 1.9 ) Pub Date : 2021-05-15 , DOI: 10.1002/srin.202100193 Qi Wang 1 , Jian Yang 2 , Jianqiang Zhang 1 , Oleg Ostrovski 1 , Chen Zhang 3 , Dexiang Cai 3
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This article investigates the effect of Na2O on melting properties, viscosity, flux structure, crystallization behavior, and heat transfer of CaO–Al2O3-based mold fluxes with Na2O concentration varied from 3.5 to 12.1 mass pct. With the increase in Na2O content, both melting temperature and viscosity at a given temperature decrease. The Raman spectroscopy indicates that increasing the Na2O content decreases the degree of polymerization, in line with the decrease in viscosity. Flux crystallization is studied using single hot thermocouple technology (SHTT) and double hot thermocouple technology (DHTT). The results show that flux crystallization tendency is enhanced with the increase in Na2O content. This increase is more significant when the Na2O content changes from 9.1 to 12.1 mass pct. X-ray diffraction analysis of the fluxes heat treated at different temperatures reveals that the crystal precipitates vary with the flux composition and temperature. Heat transfer measurement using the IR emitter technique (IET) shows that the increase in Na2O concentration impedes the heat transfer, in line with the increased crystallinity of the fluxes.
中文翻译：
Na2O 对 CaO-Al2O3 基熔模剂性能、结构和结晶的影响
本文研究了 Na 2 O 对 Na 2 O 浓度在 3.5 到 12.1 质量百分比范围内的 CaO-Al 2 O 3基结晶器熔剂的熔化特性、粘度、熔剂结构、结晶行为和传热的影响。随着 Na 2 O 含量的增加，在给定温度下的熔融温度和粘度均降低。拉曼光谱表明，增加 Na 2O含量降低聚合度，与粘度降低一致。使用单热热电偶技术 (SHTT) 和双热热电偶技术 (DHTT) 研究通量结晶。结果表明，随着Na 2 O含量的增加，助熔剂的结晶倾向增强。当 Na 2 O 含量从 9.1 变化到 12.1 质量 pct时，这种增加更为显着。在不同温度下热处理的焊剂的 X 射线衍射分析表明，晶体析出物随焊剂组成和温度而变化。使用 IR 发射器技术 (IET) 的传热测量表明，Na 2 O 浓度的增加会阻碍传热，这与焊剂结晶度的增加一致。
更新日期：2021-05-15
中文翻译：
Na2O 对 CaO-Al2O3 基熔模剂性能、结构和结晶的影响
本文研究了 Na 2 O 对 Na 2 O 浓度在 3.5 到 12.1 质量百分比范围内的 CaO-Al 2 O 3基结晶器熔剂的熔化特性、粘度、熔剂结构、结晶行为和传热的影响。随着 Na 2 O 含量的增加，在给定温度下的熔融温度和粘度均降低。拉曼光谱表明，增加 Na 2O含量降低聚合度，与粘度降低一致。使用单热热电偶技术 (SHTT) 和双热热电偶技术 (DHTT) 研究通量结晶。结果表明，随着Na 2 O含量的增加，助熔剂的结晶倾向增强。当 Na 2 O 含量从 9.1 变化到 12.1 质量 pct时，这种增加更为显着。在不同温度下热处理的焊剂的 X 射线衍射分析表明，晶体析出物随焊剂组成和温度而变化。使用 IR 发射器技术 (IET) 的传热测量表明，Na 2 O 浓度的增加会阻碍传热，这与焊剂结晶度的增加一致。
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