Halides in SHS Azide Technology of Nitrides Obtaining

In the present world, the interest to oxygen-free refractory inorganic materials is growing with respect to the fact that it becomes the basis for various materials. The scientific interest is first related to the nitrides and carbonitrides with a number of unique properties such as high refractoriness, thermal resistance, chemical environment resistance, relatively low density, and so on. 

Nitride Ceramics Combustion Synthesis, Properties, and Applications, First Edition. 

Stoichiometric equations of chemical reactions SHS for obtaining nitrides and carbonitrides with use of inorganic azides look like  

Holt from Lawrence Livermore National Laboratory in works [15—18], published in 1983-1984, has offered, irrespective of works of the SSTU, a similar idea on the use of sodium azide during burning. Under the direction of Dr. J.B. Holt s was investigated the Metal Oxide — Metal Reducing Agent — Sodium Azide system usability, apart from Metal - Sodium Azide systems, for the production of nitrides in a combustion mode. 

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The basic laws of burning of systems element-sodium azide-halide and synthesis of final refractory powders are investigated. Once the optimal technological parameters of synthesis are found, the technological process of obtaining of powders nitrides, carbonitrides, and compositions on their basis in a mode SHS-Az [12] is developed. It was found that the most appreciable influence on quality of final powders render density of reactor loading, pressure of gaseous medium, ratio of components in system, and size of particles in initial components mixture. 

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