• 제목/요약/키워드: molten-salt

검색결과 374건 처리시간 0.03초

염 용액에서의 화학적 이온교환 강화유리에 관한 연구 (A Study on the Glass Strengthened in Salt Solution by Chemical Ion Exchange)

  • 이종근;김인섭
    • 한국세라믹학회지
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    • 제24권4호
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    • pp.335-342
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    • 1987

  • There were several numbers of studies on chemically strengthening glass. Most of them were strengthened in molten salt bath below transformation range of glass. Apart from them, this study used solution hydration technique by Autoclave. After determining proper concentration of AgNO3 salt solution, experimental condition varied from 4hrs to 16hrs at relatively low temperature (180, 200, 220$^{\circ}C$). The results showed that the Soda-Lime-Silica glass could be strengthened by diffusion mechanism without influence of water above 15% salt solution. Because of Ag+ ion penetration in glass surface, yellow color appeared and decreased transmittance at visible range. Modulus of rupture was increased with the amount of exchange and brittleness was decreased.

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알루미늄 Droplets 합체거동에 미치는 Salt Flux 및 합금원소 첨가의 영향 (Effects of Salt Flux and Alloying Elements on the Coalescence Behaviour of Aluminum Droplets)

  • 김예식;윤의박;김기태;정운재;조덕호
    • 한국주조공학회지
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    • 제20권1호
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    • pp.38-45
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    • 2000

  • The remelting for recycling or thin aluminum scrap, such as aluminum chip generally involves melting of these pieces submerged in molten salt flux. In this study, the effects of salt flux compositions and alloying elements on the aluminum dropletscoalescence and oxide film removal were studied in 99.8%Al, Al-1.01%Cu, Al-1.03%Si, and Al-1.38%Mg alloys as a function of holding time at $740^{\circ}C$ Salt fluxes based on NaCl-KCl(1:1) with addition of 5wt.% fluorides(NaF, $Na_3AlF_6$, $CaF_2$) or 5 wt.% chloride($MgCl_2$, $AlCl_3$) 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 tension between metal and salt flux.

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