What is thermite

by:Zeyi     2021-06-22
Introduction to Thermite Thermite is a mixture of aluminum powder and refractory metal oxides. The common thermite is a mixture of aluminum powder and iron trioxide powder in proportion to form a pink mixture. When it is ignited with an igniter, the reaction proceeds violently to obtain aluminum oxide and elemental iron and release a large amount of heat. The temperature can reach 3000 ℃, can make the produced iron melt. Thermite is an important component of thermite reaction, which plays an important role in high temperature outdoor operations such as orbital welding. Can be used to initiate some reactions that require high temperatures. The thermite is a mixture of aluminum powder and iron trioxide powder in proportion. When used, it is ignited by adding an oxidant. The reaction proceeds violently to obtain aluminum oxide and elemental iron and release a lot of heat. The temperature can reach about 2482℃, Melt the resulting iron. This reaction is called the thermite reaction and was invented by French chemist H. Glodschmidt (1861-1923) in 1895. The principle of thermite reaction can be applied to production, such as welding steel rails. Using some metal oxides (such as V2O5, Cr2O3, MnO2, etc.) instead of iron oxide can also be used as thermite. When aluminum powder reacts with these metal oxides, enough heat is generated to make the reduced metal melt at a higher temperature and separate from the formed slag, thereby obtaining a purer metal. This method is commonly used in industry to smelt refractory metals, such as vanadium, chromium, and manganese. The use of heat is when aluminum is oxidized. At present, solid rocket fuel abroad also uses the principle of thermite reaction. There are two descriptions of the thermite in the textbook. One is that 'the mixture of aluminum powder and iron oxide is usually called the thermiteEtc.) It can also be used as thermite instead of iron oxide'. That is, the mixture that can undergo thermite reaction is called the thermite. This means that metal oxides, which are an important component of thermite, do not refer to all metal oxides in general, but have a certain range, that is, those refractory metal oxides. These refractory metal oxides emit a lot of heat when reacting with aluminum in the mixture, which is also an important condition for the formation of the thermite reaction. Some metal oxides cannot be used as thermite because they cannot react with aluminum or emit little heat. In addition to welding rails and smelting refractory metals, the thermite is also widely used in the military. For example, the thermite composition is installed in the bullet-nozzle, which can greatly improve the lethality. In the book 'Rocket Launcher' compiled by scientists of the former Soviet Union, it is mentioned that the rocket warhead charge contains the thermite. In the Military Museum of the Chinese People's Revolution, among the exhibits are the steel helmets and carbines of the U.S. military, which were fused together. Except for rockets, other bombs do not have such a large amount of energy. In summary, only a mixture of oxides and aluminum powder that meets the above conditions can be called thermite. ————The article comes from the Internet. If there is any infringement, please contact to delete it.
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