Thermal barrier coating with high bonding strength and preparation method thereof

Abstract

The invention discloses a thermal barrier coating with high bonding strength. Aluminum powder is added, and after high-temperature calcination modification is conducted, the antioxygenic property of a ceramic phase and the permeability of matrix metal can be improved. Partial particles are not sufficiently fused in a plasma jet in the spraying process, the deformation degree is slightly weak when the particles impact on a matrix, a jointly-overlapped porous structure can be easily formed, and the thermal insulation property of the coating is improved. In addition, by means of a modification method, Zr<4+> is replaced with Y<3+> and Ce<4+> in zirconium dioxide crystal lattices, oxygen vacancies and local stress fields are produced, the phonon scattering in the crystal lattices is increased, and the thermal conductivity is significantly decreased; the atomic mass of solid solution atoms Ce is far larger than that of Y, the scattering intensity of phonons in the thermal barrier coating can be significantly improved, and therefore the thermal conductivity is decreased. The prepared thermal barrier coating is excellent in comprehensive performance, excellent in thermal insulating performance, high in bonding strength and long in thermal cycling life and thermal shock life.

Description

technical field [0001] The invention relates to the technical field of ceramic material processing, in particular to a thermal barrier coating with high bonding strength 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 working temperature in the combustion chamber has far exceeded the service temperature limit of Ni-based superalloys. The preparation of thermal barrier coatings on the surface of superalloy substrates has a very direct effect on improving the temperature bearing capacity of the substrates, thereby effectively increasing the working temperature of parts and prolonging their service life. [0003] Thermal barrier coating is generally a functional coating that utilizes materials with relatively low thermal conductivity and is coated on the surface of superalloy substrates with appropriate technology to p...

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