SEM-EDX study of the crystal structure of the condensed combustion products of the aluminum nanopowder burned in air under the different pressures

The experimental results of combustion of aluminum nanopowder (ANP) in air and AlN crystals formation process were studied. The air pressure during the combustion process significantly affected the crystals growth mechanism. Crystals with the different morphology (whiskers, hexagonal crystals, rods) were found in the condensed combustion products.

Research highlights▶ Combustion of Al nanopowder in air results in formation of the anisotropic crystals of AlN. ▶ The ratio 'length/diameter' is different for the crystals of AlN depending on air pressure during combustion. ▶ AlN formation during combustion is allowed by fast cooling of combustion products.