Chromium Combustion in a Concurrent Nitrogen Flow
M. H. Ziatdinov
Tomsk State University, Tomsk, 634010 Russia
Keywords: самораспространяющийся высокотемпературный синтез, фильтрационное горение, спутная фильтрация, сверхадиабатический разогрев, инверсная волна, нитриды хрома, self-propagating high-temperature synthesis, filtration combustion, concurrent filtering, superadiabatic heating, inverse wave, chromium nitrides
Abstract
The process of chromium powder combustion in a concurrent flow of nitrogen-containing gas in a range of specific flow rate of up to 20 cm3/(c x cm2) is studied. The use of forced filtering intensifies the combustion wave propagation in the Cr-N2 system. In this case, the combustion rate increases simultaneously with the decreasing degree of nitriding. The modes of superadiabatic heating with a flow of pure nitrogen and a hydrogen-argon mixture. It is shown that the use of a gaseous mixture promotes the formation of the inverted combustion wave. The tempering mode used in forced filtering allows fixating the high-temperature single-phase nonstoichiometric nitride Cr2N.
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