Filtration–diffusion combustion limit of a titanium powder in nitrogen upon degassing

The propagation of the filtration–diffusion combustion front deep in a bulk of titanium powder in a nitrogen medium is studied experimentally. The dependence of the combustion–propagation depth on the height of a fill of titanium powder and the pressure of gaseous nitrogen, the effect of degassing impurities on the limit, and some specific features of combustion are revealed. A model of the process by means of which a formula for estimation of the burning–out depth of the fill is derived is proposed.