Inflaming retarding and corrosion resisting thermal barrier coating and manufacturing method thereof

Abstract

The invention discloses an inflaming retarding and corrosion resisting thermal barrier coating. Aluminum powder is added and modified through high-temperature calcination, and therefore oxidation resistance performance and permeability of base metal of a ceramic phase can be improved. In the spraying process, part of particles are not molten sufficiently in the plasma jet flow, the transformation degree is slightly weak in the base body collision process, porous structures in lap joint together are easily formed, and the thermal insulation performance of the coating is improved. In addition, by means of a modification method, Zr4+ is replaced by Y3+ and Ce4+ in a zirconium dioxide crystal lattice, and the oxygen vacancy and the local stress field are produced. The phonon scattering in the crystal lattice is increased, and the thermal conductivity is obviously reduced. The atomic weight of the solid solution atom Ce is far larger than that of Y, the scattering strength of phonons in a product can be obviously improved, and therefore the thermal conductivity is reduced. The prepared coating is low in water absorbing rate, good in tenacity and not prone to cracking or layering and has the inflaming retarding corrosion resistance, abrasion resistance and good thermal shock performance.

Description

technical field [0001] The invention relates to the technical field of ceramic material processing, in particular to a flame-retardant and corrosion-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 appropriate te...