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- W1966473776 abstract "For the ultra-purification of base metals a new arc melting furnace, a new induction-heating floating-zone melting furnace and a new cold-crucible induction melting furnace have been designed and constructed using ultra-high vacuum technology. The ultra-high vacuum attainable in this induction-heating floating-zone melting furnace is so good as 1×10-7 Pa that an iron bar can be zone-melted not only in ultra-higher vacuum but also in higher purity gas atmosphere containing less residual gases than those in a conventionally used one. The high-purity electrolytic iron which had been developed by us has been purified by the combination of these melting furnaces. The concentration of C+N+O+S easily decreases from 14.4 mass ppm before zone-leveling to 2.9 mass ppm and 2.2 mass ppm after only four zone-leveling passes in dry hydrogen and further four zone-leveling passes in ultra-high vacuum, respectively, and each impurity concentration is below 1 mass ppm. Ultra-high vacuum is very important and effective for the ultra-purification of iron and also the other base metals and alloys." @default.
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- W1966473776 date "1976-12-01" @default.
- W1966473776 modified "2023-09-26" @default.
- W1966473776 title "Preparation of high-purity iron by electron-beam floating-zone melting under ultra-high vacuum" @default.
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- W1966473776 doi "https://doi.org/10.1016/0036-9748(76)90032-6" @default.
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