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AssigneeTaiyo Nippon Sanso Corporation
InventorsYutaka Nagakura, Kenji Tokuda, Makoto Morishita, Hiroshi Sanui, Yuji Nomura
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To provide a method for producing an aluminum ingot whose oxides is reduced by preventing the surface of molten aluminum from being oxidized. The method according to the present invention includes a melting step (melting furnace 1) of melting an aluminum base metal into a molten aluminum or molten aluminum alloy; a holding step (holding furnace 2) of holding the resulting molten aluminum or molten aluminum alloy; a dehydrogenation step (dehydrogenation unit 3) of removing hydrogen gas from the molten aluminum or molten aluminum alloy; a filtration step (filter 4) of removing inclusions from the molten aluminum or molten aluminum alloy; and a casting step (casting device 5) of solidifying the molten aluminum or molten aluminum alloy into a predetermined shape, wherein at least one of the above steps is conducted in the atmosphere of a protective gas containing fluorinating gas, carbon dioxide gas, and nitrogen and/or argon gas.
A method for producing an aluminum ingot of aluminum or aluminum alloy, the method comprising:
An aluminum ingot of aluminum or an aluminum alloy, containing 10 ppm or lower Al2O3 and MgAl2O4, and 4 ppm or lower Al4C3 and Al2C6.
An aluminum ingot containing 7-40 mass % magnesium.
A protective gas containing 0.001-1 mass % fluorinating gas, 0.01-10 mass % carbon dioxide gas, and the balance which includes at least one of nitrogen gas and argon gas.
Dependencies are inferred from the claim text.