Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 39, Issue 10, Pages 3120-3128Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.04.020
Keywords
Thermal barrier coating; Yttria stabilized zirconia; Air plasma spray; Dense vertically cracked; In situ microcompression
Categories
Funding
- U.S. Office of Naval Research [N00014-17-1-2087, N0014-16-1-2778]
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8 weight percent yttria stabilized zirconia (8YSZ) has gained widespread use in thermal barrier coatings for the hot sections of aero and power generation turbines due to its superb thermal and mechanical properties. In this study, in situ microcompression tests were conducted to evaluate the mechanical performance of 8YSZ coatings with dense vertically cracked (DVC) microstructures produced by detonation gun thermal spray to those deposited by air plasma spray (APS). At room temperature, the APS coatings showed high variability in fracture strength resulting from cracks and pores in the coating. DVC coatings, conversely, exhibited fracture strengths ranging from 3.9 to 6.6 GPa and less variability in fracture strength attributed to the relatively dense and less defective microstructure. At 500 degrees C, both coatings showed better consistency of fracture strength and enhanced deformability owing to deformable pores, ferroelastic domain switching, and dislocation activities.
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