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pISSN : 1598-706X / eISSN : 2288-8381


한국주조공학회지 (20권1호 38-45)

Effects of Salt Flux and Alloying Elements on the Coalescence Behaviour of Aluminum Droplets

알루미늄 Droplets 합체거동에 미치는 Salt Flux 및 합금원소 첨가의 영향

Ye-Sik Kim, Eui-Pak Yoon, Ki-Tae Kim*, Woon-Jae Jung*, Duk-Ho Jo**

Hanyang University, *Korea Institute of Industrial Technology, **Daejon National Univ. of Tech.


The rernelting for recycling of thin aluminum scrap, such as aluminum chip generally involves melting of these pieces sub- merged in molten salt flux. In this study, the effects of salt flux compositions and alloying elements on the aluminum dropletscoa- lescence and oxide film removal were studied in 99.8%Al, Al-l .ol%Cu, Al-l.03%Si, and Al-1 .38%Mg alloys as a function of holding time at 740°C Salt fluxes based on NaC1-KCl(l : l) with addition of 5wt.% fluorides(NaF, Na3AlF6, CaF2) or 5 Wt.% chloride(MgCl2, AlCl3) were used. The experimental results show that NaCl-KCl( l : 1)with addition of 5 wt.% fluorides exhibits better coalescence ability than that with chlorides. The oxide film is not removed by NaC1-KCl(l : 1) with addition of 5 wt.% chlo- rides, while it is removed by NaC1-KCl(l : l) with addition of 5 wt.% fluorides. The aluminum droplets coalescence and oxide film removalby saltfluxes are relatedto interfacialtension between metaland saltflux.