Microstructure and mechanical properties of Sc2O3-Y2O3 co-doped ZrO2 ceramic materials for thermal barrier coating
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-Y2O...
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Published in | Cai liao gong cheng = Journal of materials engineering Vol. 52; no. 6; pp. 139 - 146 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | Chinese |
Published |
Journal of Materials Engineering
20.06.2024
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Subjects | |
Online Access | Get full text |
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Summary: | 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 |
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ISSN: | 1001-4381 1001-4381 |
DOI: | 10.11868/j.issn.1001-4381.2024.000214 |