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Investigation of Calcium–Aluminate-Based Mold Flux of Different Compositions
Steel Research International ( IF 1.9 ) Pub Date : 2021-05-13 , DOI: 10.1002/srin.202100187
Irmtraud Marschall 1 , Harald Harmuth 1, 2
Affiliation  

The liquidus temperature, crystallization behavior, and viscosity of calcium–aluminate (CA)-based mold flux systems are investigated by differential thermal analysis, quench tests, and viscosity measurements to understand the impact of SrO, B2O3, F, and Li2O on the flux properties. For mixtures with a CaO/Al2O3 (wt%) ratio of 1, the liquidus temperature of 1443 K and a viscosity of 0.37 Pa s are achieved with the addition of 6.5 wt% B2O3. Substitution of CaO for 8.3 wt% SrO in the B2O3-free compositions increases a liquidus temperature from 1547 to 1559 K, and 2.6 wt% increases the viscosity from 0.35 to 0.41 Pa s, indicating that low amount SrO is not beneficial in adjusting slag properties of CA mold flux. A fluorine content of up to 6.1 wt% decreases the melting temperature from 1547 to 1509 K and inhibits crystallization while promoting volatilization in the liquid state. Li2O (2.3 wt%) effectively enhances the glass-forming ability of the CA mold flux and decreases both the liquidus temperature from 1571 to 1509 K and the viscosity of the system from 0.43 to 0.28 Pa s. This study deepens the knowledge on CA flux systems, which could be useful for their effective design.

中文翻译:

不同成分的铝酸钙基熔模剂的研究

通过差热分析、淬火测试和粘度测量研究了基于铝酸钙 (CA) 的保护渣系统的液相线温度、结晶行为和粘度,以了解 SrO、B 2 O 3、F 和 Li的影响2 O 关于助焊剂的特性。对于 CaO/Al 2 O 3 (wt%) 比率为 1 的混合物,通过添加 6.5 wt% B 2 O 3可实现 1443 K 的液相线温度和 0.37 Pa s 的粘度。在 B 2 O 3中用 CaO 代替 8.3 wt% SrO不含-的组合物将液相线温度从 1547 提高到 1559 K,并且 2.6 wt% 将粘度从 0.35 提高到 0.41 Pa s,表明少量 SrO 不利于调节 CA 脱模剂的熔渣性能。高达 6.1 wt% 的氟含量将熔化温度从 1547 K 降低到 1509 K,并在促进液态挥发的同时抑制结晶。Li 2 O (2.3 wt%)有效地提高了CA保护渣的玻璃形成能力,将液相线温度从1571降低到1509 K,体系的粘度从0.43降低到0.28 Pa s。这项研究加深了关于 CA 通量系统的知识,这可能有助于他们的有效设计。
更新日期:2021-05-13
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