Research on the thermal properties and anti-CMAS performance of multi-component thermal barrier coatings

Abstract

Thermal barrier coatings (TBCs) directly determine the service life of high-temperature alloy substrates and energy utilization efficiency. This study innovatively uses a multi-component design strategy. Through the solid-state reaction method, a series of A2B2O7-type oxides are synthesized. The study systematically reveals the structure-property relationship among material composition, microstructure, and properties. Research has found that introducing multiple rare-earth elements to create lattice distortion, combined with grain refinement control to significantly enhance the phonon scattering effect, can lower the material’s thermal conductivity. Besides, by building an in-situ apatite-like dense barrier layer (thickness > 5 µm) and the synergistic effect of multi-valence-ion doping, the penetration of CMAS melt and ion migration and diffusion under high-temperature corrosion conditions are successfully blocked. This research offers theory and technology for developing next-generation thermal barrier coatings with excellent heat insulation and long-term environmental stability. This is highly significant for the long-life design of aero-engine hot-section components.