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VACUUM ›› 2025, Vol. 62 ›› Issue (5): 39-43.doi: 10.13385/j.cnki.vacuum.2025.05.06

• Thin Film • Previous Articles     Next Articles

Microstructure and Mechanical Properties of Sc2O3-Y2O3-ZrO2 Ceramic Materials for Thermal Barrier Coating

GUO Maomao1, XIE Min1, WANG Zhigang1, MU Rende1,2, SONG Xiwen1,3, ZHANG Yonghe1   

  1. 1. School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;
    2. Beijing Institute of Aeronautical Materials, Beijing 100095, China;
    3. Ordos Vocational College, Ordos 017000, China
  • Received:2025-02-12 Published:2025-09-29

Abstract: Multi rare-earth oxide doping is used to improve the comprehensive performance of traditional YSZ thermal barrier coatings, Sc2O3-Y2O3-ZrO2 (ScYSZ system) ceramic materials with different Sc2O3 and Y2O3 ratios (total molar fraction of 8mol.%) were synthesized by the solid-state method. The microstructure and room temperature mechanical properties of ceramic samples were tested and analyzed, compared with the traditional 8YSZ ceramic material. The results show that the ScYSZ ceramics prepared by the solid-state method are composed of t' (the main phase) and c phases, and the proportion of t' phase increases with the Sc2O3 content. The fracture surface of ScYSZ ceramics is smooth, and the doping of Sc2O3 does not change the brittle fracture characteristics of YSZ materials. When the Sc2O3 molar fraction is ≥ 7.3%, the hardness of the ScYSZ system is about 4%-6% higher than that of 8YSZ, and it exhibits good comprehensive mechanical properties at room temperature. ScYSZ ceramics can be used as a potential ceramic material for thermal barrier coating.

Key words: solid-state method, ScYSZ ceramic material, microstructure, mechanical property

CLC Number:  TQ174.75;TB3

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