Kalinichenko O. Oxide - ceramic coatings of various functional purposes on light alloys

The thesis for the scientific degree of сandidate of technical sciences in speciality 05.17.11 - technology of refractory nonmetallic materials.-The State High Education Institution "Ukrainian State University of Chemical Technology", Dnipro, 2017. The thesis is devoted to the scientific justification and development of technology of oxide-ceramic coatings on aluminium, titanium and their alloys. Calcium-phosphate layers with bio-resorptive properties and silicate coatings impregnated by catalytically active substances were obtained. The sequence of stages for coatings growth was established It was shown that the main gas released during coatings formation is hydrogen - the by-product of thermochemical reaction between metal's particles dispersed in discharges and water vapour. The occurrence of hydrogen at spark conditions (high temperatures and pressures) leads to the formation of metal nonstoichiometric oxides that dramatically change structure of the surface layer, causing the formation of a loose layer. The bioactive coatings include a calcium-phosphate compounds, the atomic ratio of calcium and phosphorus essentially linearly and depending on the concentration of the solution. It was shown that the oxide-ceramic coating produced on aluminium and titanium in silicate solution may serve as inert under layer for the following deposition of catalytically active oxides (Cu, Mn, Co)/AI2O3 (TiO2) nSiO2. These oxides accelerate the burning of diesel soot at temperatures around 250°C, pure soot burning at temperature of 415°C without catalyst.