一种用于铝合金熔体精炼的熔剂设计新策略。

A New Strategy on Designing Fluxes for Aluminum Alloy Melt Refinement.

作者信息

Zhang Guoqing, Lu Weihong, Wu Xiaocong, Yang Bo, Tan Yapeng, Xu Zhengbing, Tang Hongqun, Zeng Jianmin, Wang Junsheng

机构信息

State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, Guangxi University, Nanning 530004, China.

Centre of Ecological Collaborative Innovation for Aluminum Industry in Guangxi, Guangxi University, Nanning 530004, China.

出版信息

Materials (Basel). 2023 Mar 14;16(6):2322. doi: 10.3390/ma16062322.

DOI:10.3390/ma16062322

PMID:36984201

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10051303/

Abstract

With the aim of obtaining a refining flux that is stable and provides effective refining of aluminum melt, a new strategy of designing the flux composition has been proposed. Ten fluxes were designed, by selecting ten molten salt compounds according to their thermophysical parameters, physical properties, and thermodynamic analysis. The melting points of the ten fluxes, and the phases transformation of the fluxes after melting, were studied by DSC and XRD, respectively. The contact angles between four groups of fluxes and alumina at refinement temperatures were studied, and the effect of refinement was characterized by a metallographic microscope. The process of the fluxes removing inclusions and degassing was analyzed thermodynamically. The research findings indicate that flux #10 (11.0 wt.%NaF, 29.5 wt.%NaCl, 46.5 wt.%NaCO, 3.0 wt.%CaF, 10.0 wt.%NaAlF) has a melting point (562.2 °C) below the refining temperature. At the refining temperature (760 °C), flux #10 has the lowest contact angle, of 12.78°. In addition, compared to that of flux STJ-A3, currently used in practice, flux #10 has a better refining effectiveness, with the pores and inclusions content of the sample being reduced to 1.11% from 2.96%.

摘要

为了获得一种稳定且能有效精炼铝熔体的精炼熔剂，提出了一种设计熔剂成分的新策略。通过根据十种熔盐化合物的热物理参数、物理性质和热力学分析来选择它们，设计了十种熔剂。分别用差示扫描量热法（DSC）和X射线衍射仪（XRD）研究了这十种熔剂的熔点以及熔化后熔剂的相变。研究了四组熔剂与氧化铝在精炼温度下的接触角，并用金相显微镜表征了精炼效果。对熔剂去除夹杂物和除气的过程进行了热力学分析。研究结果表明，熔剂#10（11.0 wt.%NaF、29.5 wt.%NaCl、46.5 wt.%NaCO、3.0 wt.%CaF、10.0 wt.%NaAlF）的熔点（562.2℃）低于精炼温度。在精炼温度（760℃）下，熔剂#10的接触角最低，为12.78°。此外，与实际使用的熔剂STJ-A3相比，熔剂#10具有更好的精炼效果，样品的气孔和夹杂物含量从2.96%降至1.11%。