Chromium combustion in a concurrent nitrogen flow

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 cm$^3$/(c $\cdot$ cm$^2$) is studied. The use of forced filtering intensifies the combustion wave propagation in the Cr–N$_2$ 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 Cr$_2$N.