一种T'-YSZ@Al2O3核壳结构的氧化铪增韧材料、制备方法以及应用
By preparing a hafnium oxide-based toughened material with a T'-YSZ@Al2O3 core-shell structure, the problem of insufficient phase transformation and fracture toughness of yttrium oxide-stabilized zirconia thermal barrier coating at high temperatures was solved, achieving high fracture toughness and density of high-temperature thermal protection coating, which is suitable for high-temperature thermal protection materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIHANG UNIV
- Filing Date
- 2024-04-29
- Publication Date
- 2026-07-17
AI Technical Summary
Existing yttrium-stabilized zirconia thermal barrier coatings undergo phase transformation and sintering during long-term use at temperatures above 1250°C, leading to stress concentration and cracking within the coating. This results in decreased mechanical properties and increased thermal conductivity, failing to meet the requirements of high-temperature and long-life aero-engines. Furthermore, zirconia materials exhibit low fracture toughness.
Hafnium oxide-based toughened materials with a T'-YSZ@Al2O3 core-shell structure are prepared by using a rare earth-stable hafnium oxide matrix and a core-shell structure coated with metastable non-phase-change tetragonal zirconium oxide. The alumina shell hinders the diffusion of zirconium and hafnium, maintaining the metastable non-phase-change tetragonal YSZ. Combined with plasma discharge sintering technology, the compactness and fracture toughness of the material are improved.
It improves the fracture toughness of the material, reaching up to 2.36±0.23MPa·m1/2, which is 10% to 60% higher than that of existing materials. It also has good compactness with a relative density of >95%, making it suitable for high-temperature heat protection coatings.
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Figure CN118420336B_ABST