Journal
CORROSION SCIENCE
Volume 157, Issue -, Pages 450-461Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.06.025
Keywords
Thermal barrier coatings (TBCs); Air plasma spraying (APS); YSZ; Laser glazing; Calcium-magnesium-alumina-silicate (CMAS)
Funding
- National Natural Science Foundation of China [51501127]
- Natural Science Foundation of Tianjin [16JCQNJC02900]
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Calcium-magnesium-alumina-silicate (CMAS) is a serious threat to thermal barrier coatings (TBCs). The goal of this study is to tailor YSZ coating microstructures by laser for alleviating CMAS attack. A smooth laser glazed layer with a columnar microstructure and some open channels is produced on the coating surface. Under molten CMAS conditions, the glazed layer remains phase stability and has little evidence of dissolution. Exposed to thermal shock tests with CMAS deposits, the glazed layer keeps structural integrity. However, the open channels also act as the paths for CMAS penetration, which brings destructive damages to the coating beneath the glazed layer.
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