Thermal barrier coating with good light resistance and thermal shock resistance and manufacturing method for thermal barrier coating

Abstract

The invention discloses a thermal barrier coating with good light resistance and thermal shock resistance. After added aluminum powder is roasted and modified at a high temperature, oxidation resistance of a ceramic phase and permeability of matrix metal can be improved; in a spraying process, part of particles are molten insufficiently in plasma jet flow, are slightly weak in deformation degree while hitting against the matrix, and are liable to form a porous structure which is lapped together, thereby improving heat insulation property of the coating; secondly, by virtue of a modification method, Y<3+> and Ce<4+> in a zirconium dioxide crystal lattice substitute Zr<4+>, so that oxygen vacancy and local stress field are generated, phonon scattering in the crystal lattice is increased, and thermal conductivity is obviously reduced; moreover, atomic weight of a solute atom Ce is much larger than that of Y, so that scattering intensity of phonons in a product disclosed by the invention can be remarkably improved, thereby reducing the thermal conductivity; and the prepared coating is high in surface hardness, good in toughness, not liable to crack and layer, has the characteristics of good light resistance, good thermal shock resistance and the like, and has a wider application.

Description

technical field [0001] The invention relates to the technical field of ceramic material processing, in particular to a thermal barrier coating with good light resistance and thermal shock resistance 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 wit...

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