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Self-propagating high-temperature synthesis
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<p>Self-propagating high-temperature synthesis (SHS) is a method for producing both <a href="/facts/Inorganic_compounds/TfFfzxSz">inorganic</a> and <a href="/facts/Organic_compounds/gqCNaN45">organic</a> compounds by exothermic <a href="/facts/Combustion/ohQoWj8z">combustion</a> reactions in solids of different nature. Reactions can occur between a solid reactant coupled with either a gas, liquid, or other solid. If the reactants, intermediates, and products are all solids, it is known as a solid flame. If the reaction occurs between a solid reactant and a gas phase reactant, it is called infiltration combustion. Since the process occurs at high temperatures, the method is ideally suited for the production of refractory materials including powders, metallic alloys, or ceramics. </p><p>The modern SHS process was reported and patented in 1971, although some SHS-like processes were known previously. </p>