Plasma-Chemical Modification of Facing Composite Material on the Basis of Hollow Glass Microspheres with Decorative Protective Coating

Abstract

The paper considers plasma-chemical modification of facing composite material on the basis of hollow glass microspheres with decorative protective coatings. It is shown that the technology of obtaining decorative protective coating by the method of plasma reflow is highly efficient and energy-saving, which will allow competition with traditional technologies and significantly reduce the cost of finishing work. Compositions of decorative protective coatings based on high-alumina refractory and liquid glass have been developed. It was revealed that the use of high-alumina refractory crushed material in the intermediate layer makes it possible to reduce the number of microcracks and eliminate the consequences of high-temperature impact on the matrix of fine-grained concrete. The positive effect of hollow glass microspheres on the minimization of thermal shock was established. The results of the investigation of the effect of plasma-chemical modification on the phase composition and structural features of the facing composite material on the basis of hollow glass microspheres with a decorative protective coating are presented. The regularity of layer-by-layer variation of the phase composition and the macro- and microstructure of the decorative protective coating of the facing composite material is established. It is shown that the upper layer is represented by Na–Ca–Al–Si glass, the middle glass ceramic layer is represented by the glass phase and α and β modifications of aluminum oxide, and the lower dehydration layer is represented by dehydration products of hydrosilicates and α and β modifications of alumina. High-temperature action of the plasma jet intensifies thermal diffusion, which in turn leads to a redistribution of oxides along the thickness of the decorative protective coating.