(山东大学 材料液态结构及其遗传性教育部重点实验室，
济南 250061)
摘 要: 研究了SDJ-1型熔剂与氮气联合净化铝合金熔体的效果，并对熔剂净化机理以及FI法(Flux injection)净化优势进行了探讨，揭示了除气过程中气体与熔剂的相互作用。结果表明：采用FI联合精炼工艺，在适当的温度(720℃)和熔剂加入量(0.15% SDJ-1)条件下，联合精炼工艺的 除气效果远远优于生产中常用的氮气吹气法和熔剂法，联合净化法的优势在于提高了吸附能力以及加入具有固氢作用的降渣剂。 FI工艺原理为：气体与熔剂在熔体中均匀分布、密切接触，气体使熔剂快速上浮，熔剂的存在提供多而窄的通道，使氢容易聚集在通道附近，即使氢含量较低时，氮气仍能发挥作用，通道的存在有利于分散和离解气泡。
关键字: 熔剂SDJ-1；氮气；喷射熔剂工艺；联合净化
flux injection degassing technique
with SDJ-1 and N2
（The Key Laboratory of Ministry of Education for Liquid Structure and
Heredity of Materials, Shandong University, Jinan 250061, China）
Abstract:The purification effect of aluminium melt by flux injection technique with SDJ-1 high-efficient flux and N2, and also the interact ion between the flux and bubbles were studied. The results show that with special flux(SDJ-1) and technology(FI), proper addition amount(0.15%) of flux and melting temperature(720℃), the technique have an advantage over other techniques. This may be due to particular inclusion-removed mechanism, which can result in dispersion of flux and bubbles. Larger interfaces, narrow channels make the hydrogen easy to gather around them and increase the difference of the hydrogen partial pressure between the bubbles and the melt around. And the channels also contribute to the dispersion and division of bubbles.
Key words: SDJ-1 flux; N2；flux injection technique; synthetic purifying
