Corrosion-resistant thermal barrier coating and preparation method thereof

Abstract

The invention discloses a corrosion-resistant thermal barrier coating. The porosity of a ceramic phase can be increased after carbon powder is added and modified through high-temperature calcination, and parts of particles are slightly low in deformation degree when impacting a matrix because of not being sufficiently molten in plasma jet in the spraying process, so that an overlapped porous structure is easily formed, and furthermore the heat insulating property of the coating is remarkably improved; in addition, Zr<4+> is substituted with Y<3+> and Ce<4+> in a zirconium dioxide crystal lattice through a modification method, so that an oxygen vacancy and a local stress field are generated, the scatter of phonons in the crystal lattice is enhanced, and the heat conductivity is remarkably reduced; and the atomic weight of a solid-solution atom Ce is far larger than that of Y, so that the scattering intensity of the phonons in the corrosion-resistant thermal barrier coating disclosed by the invention can be remarkably improved, and furthermore the heat conductivity is reduced. The preparation process is simple; and the prepared coating is porous and excellent in high-temperature resistance and heat insulating property, has corrosion resistance, molten salt corrosion resistance and favorable thermal shock property and is widely applied to the fields of aviation, aerospace, traffic and energy.

Description

technical field [0001] The invention relates to the technical field of ceramic material processing, in particular to a corrosion-resistant 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 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 play a r...

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