Resistance to High-Temperature Gas Corrosion of Сhromaluminizing Coatings with a (Ti, Zr)N Layer on Nickel

The paper presents the results of a study on the thermal insulation properties of polymer composites based on fly ash from thermal power plants. Aqueous dispersions of styrene-butadiene (Latex 2012) and acrylic (Policril 590) polymers were used as the matrix. A complex multifactorial dependence of the thermal conductivity of the composite materials on the type and properties of the ash, its content, the type and concentration of the polymer dispersion, density, porosity, and temperature was established. The decisive role of the pore structure in forming effective thermal insulation was demonstrated. It was found that a more developed specific surface area, higher wettability, and lower filler density contribute to the reduction of thermal conductivity. A tendency for thermal conductivity to increase with rising composite density was identified, which is explained by a reduction in the volume of air pores. lowest thermal conductivity was shown by composites containing fly ash with a filler concentration of 65 wt.% in combination with an acrylic matrix. This particular ash consist of: 46.1 wt.% silicon dioxide, 18.0 wt.% aluminum oxide, 22.2 wt.% iron oxide, with the total content of alkali and alkaline earth oxides reaching 7.6 wt.%. The acrylic matrix demonstrated thermally stable behavior within the investigated temperature range. The developed materials are characterized by a low thermal conductivity, acceptable density, and high potential for use as lightweight thermal insulation coatings in energy-efficient technologies, construction, and other industries. The obtained results provide a basis for determining the optimal conditions for the production of efficient thermal insulation materials utilizing industrial waste.