![]() The reactants are commonly powdered and mixed with a binder to keep the material solid and prevent separation. The products are aluminum oxide, elemental iron, and a large amount of heat. In the following example, elemental aluminum reduces the oxide of another metal, in this common example iron oxide, because aluminum forms stronger and more stable bonds with oxygen than iron: The sparks flying outwards are globules of molten iron trailing smoke in their wake. Some thermite-like mixtures are used as pyrotechnic initiators in fireworks.Ī thermite reaction using iron(III) oxide. Thermites have also been used in metal refining, disabling munitions, and in incendiary weapons. ![]() The reaction, also called the Goldschmidt process, is used for thermite welding, often used to join railway tracks. Oxidizers include bismuth(III) oxide, boron(III) oxide, silicon(IV) oxide, chromium(III) oxide, manganese(IV) oxide, iron(III) oxide, iron(II,III) oxide, copper(II) oxide, and lead(II,IV) oxide. ![]() Aluminum is common because of its high boiling point and low cost. Fuels include aluminium, magnesium, titanium, zinc, silicon, and boron. Its form of action is similar to that of other fuel-oxidizer mixtures, such as black powder. Most varieties are not explosive, but can create brief bursts of heat and high temperature in a small area. When ignited by heat or chemical reaction, thermite undergoes an exothermic reduction-oxidation (redox) reaction. Thermite ( / ˈ θ ɜːr m aɪ t/) is a pyrotechnic composition of metal powder and metal oxide. A thermite mixture using iron (III) oxide
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