Abstract
Phase composition in an air plasma-sprayed Y2O3-stabilized ZrO2 (YSZ) top coating of a thermal barrier coating (TBC) system was characterized. Both the bulk phase content and localized pockets of monoclinic zirconia were measured with Raman spectroscopy. The starting powder consisted of approx. 15 vol.% monoclinic zirconia, which decreased to approx. 2 vol.% in the as-sprayed coating. Monoclinic zirconia was concentrated in porous pockets that were evenly distributed throughout the TBC. The pockets resulted from the presence of unmelted granules in the starting powder. The potential effect of the distributed monoclinic pockets on TBC performance is discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 68-72 |
| Number of pages | 5 |
| Journal | Journal of Thermal Spray Technology |
| Volume | 9 |
| Issue number | 1 |
| DOIs | |
| State | Published - Mar 2000 |
Funding
The authors would like to thank G. Bancke and Professor C.C. Berndt for spraying the coatings. Research was funded by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory Fellowship Program, and the Office of Industrial Technologies, Advanced Turbine Systems Materials Program, Oak Ridge National Laboratory, managed by Lockheed Martin Energy Research Corp. for the U.S. Department of Energy under Contract No. DE-AC05-
| Funders | Funder number |
|---|---|
| Lockheed Martin Energy Research Corp. | |
| Office of Industrial Technologies | |
| Office of Transportation Technologies | |
| U.S. Department of Energy | DE-AC05 |
| Office of Energy Efficiency and Renewable Energy | |
| Oak Ridge National Laboratory |