SHS of ultrafine and nanosized refractory powders: An autoreview

Overviewed are some results of our recent works aimed at the synthesis of ultrafine and nanosized refractory powders by SHS combined with chemical dispersing of combustion products. The microstructure of synthesized powders was found to depend on the type and amount of added modifying agents. Successive chemical dispersing of raw products with solutions of different acids, alkalis, and salts leads to an increase in the specific surface and a decrease in the particle size caused by dissolution and wash-out of the impurities and intermediate products present in raw products. Our experience in preparation, separation, and purification of SHS-produced nanopowders can be used as a basis for elaboration of general methodology for pilot-scale production of nanostructured compounds and composites.