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thermite
A mixture of powdered aluminum and iron oxide (Fe3O4) in equivalent amounts, used in welding and incendiary bombs. On ignition with a barium peroxide or magnesium fuze, a violently exothermic oxidation reaction occurs, producing molten iron at 2,500°C and alumina slag. It thus supplies both the heat and the metal for welding, and can be used to join large parts in a preheated refractory mold.
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