Results are given for development of crystalline α-Al2O3 phase, crystal dimensions, degree of corundum phase crystallization microstructure, powder specific surface, and particle size distribution, obtained in the course of combustion of components in dry mixes using aluminum powder and different oxidizing agents. Aluminum powder combustion in the presence of oxidizing agents in the field from potassium nitrate to potassium perchlorate facilitates formation of broader, crystalline, and simultaneously intense diffraction maxima for α-Al2O3 phase. This is reflected in smaller crystal sizes and degree of corundum phase crystallization. Development of powder microstructure is governed by densely sintered particles, consisting of soft and hard agglomerates. It is relatively porous in the course of combustion with participation of strong oxidizing agents. This shows up as a less developed specific powder surface and wider particle size distribution, located in a field of coarse fractions in the range 5 – 54 μm, in contrast to powder prepared using potassium nitrate, whose particle sizes are located in the range 0.5 – 1.2 μm.
Refractories and Industrial Ceramics – Springer Journals
Published: Apr 4, 2014
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