A Multilayer Thermal Barrier Coating Against Volcanic Ash Erosion

Abstract

The invention relates to a trass volcanic ash erosion resistance multi-layer thermal barrier coating. The multi-layer thermal barrier coating comprises a high-temperature anti-oxidation adhesive layer, a ceramic bottom layer, a ceramic transition layer and a trass volcanic ash erosion resistance ceramic surface layer which are sequentially formed on a high-temperature alloy base material, wherein the ceramic bottom layer comprises zirconium oxide with stable yttrium oxide, the ceramic transition layer comprises zirconium oxide with stable yttrium oxide, the percentage content of yttrium oxide in the ceramic transition layer is higher than that in the ceramic bottom layer, and the trass volcanic ash erosion resistance ceramic surface layer comprises yttrium oxide. After the multi-layer thermal barrier coating reacts with trass volcanic ash at high temperature, the trass volcanic ash and the trass volcanic ash erosion resistance ceramic surface layer perform a chemical reaction, active components in the trass volcanic ash is consumed or a penetrative diffusion barrier layer is formed in the trass volcanic ash erosion resistance ceramic surface layer, the trass volcanic ash is prevented from eroding the ceramic bottom layer, the ceramic bottom can be effectively protected from high temperature erosion of trass volcanic ash, the erosion resistance of the thermal barrier coating can be greatly improved, and the service life of the thermal barrier coating can be prolonged.

Description

technical field [0001] The invention relates to an anti-volcanic ash erosion multi-layer thermal barrier coating, which belongs to the technical field of thermal protection of inorganic materials. Background technique [0002] Since the 1940s, aeroengine turbine blade materials have developed from forged alloys to cast alloys, and then from directionally solidified alloys to single crystal alloys, and their service temperature has approached the heat resistance limit of metals. The thermal barrier coating is a coating system composed of a high-temperature oxidation-resistant alloy bonding layer and a ceramic surface layer. The ceramic layer is connected to the metal substrate by means of the alloy bonding layer, and the bonding layer can also resist high-temperature oxidation of the substrate. . The ceramic layer is a thermal barrier coating with high temperature resistance and low thermal conductivity. It not only prevents the heat from the external environment from transf...

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Problems solved by technology

[0004] In the high-temperature service environment of thermal barrier coatings, sand and dust such as volcanic ash drifting in the atmosphere are deposited on the surface of high-temperature thermal barrier coatings, forming glass-phase volcanic ash deposits, and volcanic ash penetrates into the ceramic layer of thermal barrier coatings, reducing the coating Layer strain tolerance, accelerate the phase transition instability and sintering of YSZ coating, and at the same time, a large stress will be generated in the coating after cooling and solidification, which will lead to premature peeling failure of the ceramic coating

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