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Microstructure and mechanical properties of Sc2O3-Y2O3 co-doped ZrO2 ceramic materials for thermal barrier coating
- Source :
- Cailiao gongcheng, Vol 52, Iss 6, Pp 139-146 (2024)
- Publication Year :
- 2024
- Publisher :
- Journal of Materials Engineering, 2024.
-
Abstract
- Partially stabilized zirconia (7YSZ) with a mass fraction of 7±1% yttrium oxide is a widely used ceramic material for thermal barrier coatings. However, its phase stability, sintering resistance, and mechanical properties decreased during the long-time operation above 1200 ℃. A new type of Sc2O3-Y2O3 co-doped ZrO2 thermal barrier coating ceramic material was proposed , and a molar fraction of 7.5%Sc2O3-x%Y2O3-(92.5-x)%ZrO2(x=0,0.1,0.2,0.3) ceramics were prepared by solid-state reaction method. The effects of Y2O3 doping on the microstructural, phase evolution, and mechanical properties(including Vickers hardness, fracture toughness, elastic modulus and three-point bending strength)were explored by XRD, SEM, and other testing methods. The results show that the relative density of Sc2O3-Y2O3 doped ZrO2 ceramics sintered at 1450 °C for 3.5 h is more than 97%, and the phase structure is composed of tetragonal phase. Compared with 6-8YSZ ceramics, Sc2O3-Y2O3 doped ZrO2 ceramics exhibit similar Vickers hardness (13-14 GPa), fracture toughness (6.5-7.0 MPa·m1/2), elastic modulus (211-214 GPa)and three-point bending strength(520-850 MPa). Fracture mechanism shows a mixture of transgranular and intergranular fracture modes, in which transgranular fracture is dominant.This ceramic can be explored as a potential thermal barrier coating material for high-temperature applications.
Details
- Language :
- Chinese
- ISSN :
- 10014381
- Volume :
- 52
- Issue :
- 6
- Database :
- Directory of Open Access Journals
- Journal :
- Cailiao gongcheng
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.86f324509a9c4eadb2d2df05eea62ef9
- Document Type :
- article
- Full Text :
- https://doi.org/10.11868/j.issn.1001-4381.2024.000214