Anti-thermal-shock thermal barrier coating with low thermal conductivity and preparation method thereof

Abstract

The invention discloses an anti-thermal-shock thermal barrier coating with low thermal conductivity. Compared with a traditional thermal barrier coating, carbon powder is added, after high temperature calcination modification is conducted, the porosity rate of a ceramic phase can be increased, and the thermal insulating performance of the coating can be significantly 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 anti-thermal-shock thermal barrier coating can be significantly improved, and therefore the thermal conductivity is decreased. According to the anti-thermal-shock thermal barrier coating with the low thermal conductivity and a preparation method thereof, the preparation technology is simple, the prepared coating is high in surface hardness, low in water absorption, good in toughness, not prone to cracking and layering, high in strain tolerance and long in anti-thermal-shock life, and the service life of the anti-thermal-shock thermal barrier coating with the low thermal conductivity is significantly prolonged compared with a thermal barrier coating of a conventional structure.

Description

technical field [0001] The invention relates to the technical field of ceramic material processing, in particular to a low thermal conductivity thermal shock 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 appro...

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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