Nano-particle electromagnetic interference prevention thermal barrier coating and manufacture method thereof

Abstract

The invention discloses a nano-particle electromagnetic interference prevention thermal barrier coating. Compared with a traditional thermal barrier coating, carbon dust is added; the porosity of a ceramic phase can be improved after high-temperature calcination modification; in a spraying process, part of particles are not melted fully in a plasma jet, so that the deformation degree of the particles is lower during impact on a base, and porous structures in lap joint with one another can be easily formed; and therefore the heat-insulating property of the coating can be obviously improved. Furthermore, according to the nano-particle electromagnetic interference prevention thermal barrier coating disclosed by the invention, by adopting the modification method, Zr<4+> in a zirconium dioxide crystal lattice is replaced by Y<3+> and Ce<4+>, so that oxygen vacancies and a partial stress field are formed; phonon scattering in the crystal lattice is increased; the heat conductivity is obviously lowered; besides, the atomic weight of the solid solution atom Ce is much greater than that of Y, so that the scattering intensity of phonons in the product can be obviously improved, and accordingly the heat conductivity is reduced. The manufacture process disclosed by the invention is simple, and the manufactured coating has an electromagnetic interference prevention property, a fused salt corrosion prevention property and a good thermal shock property.

Description

technical field [0001] The invention relates to the technical field of ceramic material processing, in particular to a nano particle anti-electromagnetic interference 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 approp...

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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