Thermal barrier coating for inhibiting matrix/thermal barrier coating bonding layer element mutual diffusion

Abstract

The invention discloses a thermal barrier coating for inhibiting matrix / thermal barrier coating bonding layer element mutual diffusion, which comprises an MCrAlY metal bonding layer and a ZrO2-6-8Y2O3 ceramic layer which are sequentially arranged on a matrix from inside to outside, and M is Ni or Co or Ni + Co; the metal bonding layer is composed of a bottom bonding layer and a top bonding layer, the components of the bottom bonding layer are completely the same as the components of the matrix, and the elements have no concentration gradient; the top bonding layer is MCrAlY, and the content of Al and Cr elements is higher than that of a base body. According to the thermal barrier coating, mutual diffusion of bonding layer / matrix elements in a traditional coating is effectively avoided, the production process is simple, efficiency is high, performance is excellent and stable, and the thermal barrier coating is suitable for being applied to hot end components of aero-engines and gas turbines on a large scale.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to a thermal barrier coating that suppresses interdiffusion of substrate / thermal barrier coating bonding layer elements. Background technique [0002] Thermal barrier coatings are the most effective means to increase the operating temperature of advanced aero-engines and gas turbine hot-end components, and are one of the indispensable key technologies for advanced gas turbines. A typical thermal barrier coating consists of 6% to 8% Y 2 o 3 Partially stabilized ZrO 2 Composition of ceramic top layer (6~8YSZ), MCrAlY (M=Ni or Co or Ni+Co) or modified aluminide bonding layer. During the high-temperature service of the thermal barrier coating, due to the difference in the composition and content of each element between the substrate and the bonding layer, interdiffusion of elements will occur at the interface: Al diffuses from the bonding layer into the matrix, Ni, C...

AI Technical Summary

Problems solved by technology

During the high-temperature service of the thermal barrier coating, due to the difference in the composition and content of each element between the substrate and the bonding layer, interdiffusion of elements will occur at the interface: Al diffuses from the bonding layer into the matrix, Ni, Cr, W, Ta , Hf, etc. diffuse from the substrate to the bonding layer; when the temperature is higher than 1000°C, the interdiffusion rate increases significantly, degrading the coating, affecting the performance of the substrate, and reducing the life of the thermal barrier coating system

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