Stain-proof self-cleaning thermal barrier coating and preparation method thereof

Abstract

The invention discloses a stain-proof self-cleaning thermal barrier coating. Oxidation resistance of a ceramic phase and permeability of base metal can be improved after aluminum powder is added and modified through high-temperature calcination. Besides, part of particles are not sufficiently melted in plasma jet in the spray coating process, the deformation degree of the particles is low when the particles collide with a base, porous structures in lap joint are formed easily, and the heat isolation performance of the coating is improved. Through the modification method, Y3+ and Ce4+ in a zirconium dioxide crystal lattice replace Zr4+, oxygen vacancy and a local stress field are generated, phonon scattering in the crystal lattice is improved, and heat conductivity is obviously lowered. Besides, the atomic weight of solid solution atoms Ce is far larger than that of Y, phonon scattering intensity in the coating can be obviously increased, and accordingly heat conductivity is lowered. The prepared coating is high in surface hardness, good in toughness and not prone to cracking or layering, has stain-proof and self-cleaning functions, and has oxidization resistance, high thermal stability and good thermal shock resistance.

Description

Technical field [0001] The invention relates to the technical field of ceramic material processing, in particular to a stain-resistant and self-cleaning thermal barrier coating and a manufacturing method thereof. Background technique [0002] With the development of aviation gas turbines in the direction of high flow ratio, high thrust-to-weight ratio, and high inlet temperature, the operating temperature in the combustion chamber has far exceeded the operating temperature limit of Ni-based superalloys. The preparation of the thermal barrier coating on the surface of the superalloy substrate has a very direct effect on improving the temperature bearing capacity of the substrate, thereby effectively increasing the working temperature of the parts and prolonging the service life. [0003] Thermal barrier coating is a kind of functional coating that uses a material with relatively low thermal conductivity and is coated on the surface of a superalloy substrate with a suitable technolog...

AI Technical Summary

Problems solved by technology

However, when thermal barrier coatings are applied to increasingly high working temperatures, they will face more harsh working environments. The thermal barrier coatings prepared by the prior art are prone to phase change, low in oxidation resistance, low in strength, and poor in high temperature stability. , easy to produce defects such as high temperature corrosion, it is difficult to meet the needs of further increase in turbine inlet temperature