Thermal barrier coating containing heat insulating ceramic layer and manufacturing method of coating

Abstract

The invention discloses a thermal barrier coating containing a heat insulating ceramic layer. Compared with a traditional thermal barrier coating, the coating has the beneficial effects that carbon powder is added and modified through high-temperature calcination, and therefore the porosity of a ceramic phase can be improved; in the spraying process, part of particles are insufficiently molten in plasma jet, and when the particles impact a base body, the deformation degree is weakened; and a lap joint porous structure is formed, and the heat insulating performance of the coating can be obviously improved. Through a modification method, Zr4+ is replaced with Y3+ and Ce4+ in a zirconium dioxide lattice, oxygen vacancy and a local stress field are generated, phonon scattering in the lattice is increased, and thermal conductivity is obviously reduced; and the atomic amount of solid solution atoms Ce is much larger than that of Y, the scattering intensity of phonons in the coating can be obviously improved, and the thermal conductivity is reduced. The preparation technology is simple, the surface hardness of the prepared coating is high, bonding between the coating and a metal base body is firm, and the heat insulating effect is good.

Description

technical field [0001] The invention relates to the technical field of ceramic material processing, in particular to a thermal barrier coating containing a heat-insulating ceramic layer 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...

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