Development of new thermal barrier coatings for aerospace equipment

Abstract

Carried out thermocyclic testing of plasma coatings with zirconium dioxide. Weak powders were removed by two methods: cryochemical and total precipitation of hydrooxides with further drying precipitation on the surface. It has been established that in the case of coating with cryochemical powder, since it has a more thin structure and low porosity, a larger thin ball of thermo-growth oxide is formed, which is more suitable for coating with commercial powder CI-7 (ZrO2+7%Y2O3). The warehouse of the alloy on the border of the alloy-scale is attributed to the fluidity of diffusion processes in the alloy and to the oval ceramic ball. Diffusion of acid builds up along the grain boundaries and in other defective sections of the ceramic ball and metal base. In bonding with cym, it is necessary to reveal that the structure of the ball, sawn by the plasma method, may have specific defects in the appearance of various types of non-successions (pores, empty, etc.), the manifestation of which should be produced before the passage of gas-like acid into the material. For such minds, it is important to go through the molding of aluminum oxide (Al2O3), the gap of dissociation is much lower, lower than titanium oxide. It has been established that microalloying of γ-aluminum titanium scandium is safe from heat resistance, refining and modifying the structure from a coherent bond between the changing and matrix phases. The introduction of scandium into the coating makes it possible to change the thermodynamic activities of aluminum and titanium in the presence of aluminum oxide (Al2O3) on the surface of the alloy during the oxidation of the rust, acidic scandium and the formation of dispersed oxide inclusions (for example, Sc2O3).