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알루미늄 Droplets 합체거동에 미치는 Salt Flux 및 합금원소 첨가의 영향
김예식 ( Ye Sik Kim ),윤의박 ( Eui Pak Yoon ),김기태 ( Ki Tae Kim ),정운재 ( Woon Jae Jung ),조덕호 ( Duk Ho Jo ) 한국주조공학회 2000 한국주조공학회지 Vol.20 No.1
The remelting 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%A1, Al-1.01%Cu, Al-1.03%Si, and Al-1.38%Mg alloys as a function of holding time at 740℃ Salt fluxes based on NaC1-KCl(1:1) with addition of 5wt.% fluorides(NaF, Na3AlF6, CaF2) or 5 Wt.% chloride(MgCl2, AlCl3) were used. The experimental results show that NaCl-KCl(1:1)with addition of 5 wt.% fluorides exhibits better coalescence ability than that with chlorides. The oxide film is not removed by NaCl-KCl(1:1) with addition of 5 wt.% chlorides, while it is removed by NaCl-KCl(1:1) with addition of 5 wt.% fluorides. The aluminum droplets coalescence and oxide film removal by salt fluxes are related to interfacial tension between metal and salt flux.