Low-cost nontoxic thermal barrier coating and manufacturing method thereof

Abstract

The invention discloses a low-cost nontoxic thermal barrier coating. The oxidation resistance of the ceramic phase and the permeability of matrix metal can be improved after modification through adding of aluminum powder and high-temperature calcination; part of particles are not fully melted in plasma jetting in the spraying process, the deformation degree is slightly weak in the matrix striking process, a porous structure in lap joint is prone to forming, and the heat insulation property of the coating is improved; through a modification method, Y3+ and Ce4+ in zirconium dioxide lattices replace Zr4+, and oxygen vacancy and a partial stress field are generated, so that phonon scattering in the lattices is increased, and the heat conductivity is obviously lowered; moreover, the atomic weight of the solid solution atom Ce is far larger than that of Y, the phonon scattering intensity in the coating can be remarkably improved, so that the heat conductivity is lowered. The low-cost nontoxic thermal barrier coating is good in process stability, low in cost and high in product particle uniformity and purity, has good sintering resistance and high temperature thermal stability, and is environmentally friendly and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of ceramic material processing, in particular to a low-cost non-toxic 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 ro...

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