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Comparative analysis of the diffuse reflectance spectra (300-2100 nm) and of the integrated absorption factor of coatings based on micropowders, nanopowders, and micropowders modified with Al 2 O 3 nanopowders has been performed. In addition, the changes in the spectra resulting from electron irradiation of the powders with energies of 30 keV at a fluence of up to 3⋅16 cm -2 have been analyzed. It has been found that the diffuse reflectance decreases in order of coatings based on micro-powders, nano-powders and modified powders, while radiation resistance increases in order of coatings based on nano-powders, modified and micropowders.

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Influence of the temperature of aluminum oxide micropowder modification with Al 2 O 3 nanopowders in the interval 200-1000°С on the granulometric composition, diffusion reflection spectra in the wavelength range 360-2100 nm, and integral solar radiation absorption coefficient of coatings fabricated on the basis of these powders as well as on changes of these parameters upon exposure to electrons is investigated. It is demonstrated that with increase in the modification temperature, the average powder particle size decreases, the negative action is intensified, and the radiation resistance of coatings increases.