Abstract
AbstractA thermal barrier coating (TBC) system survived 500 hours in aggressive, 1300°C burner rig testing. The yttria‐stabilized zirconia (7YSZ) TBC was plasma sprayed on an oxidation‐resistant Ti2AlC‐type MAX phase and tested in a jet fuel burner at 100 m/s, using 5 hours cycles. No coating spallation or surface recession was observed; Al2O3‐scale growth produced a slight 2.4 mg/cm2mass gain. The coating surface exhibited craze‐cracked colonies of [111]flouritetextured columns, with no visible moisture attack. The 20 μm alumina scale remained intact under the YSZ face, about twice that producing failure for TBC/superalloy systems. TiO2nodules, initially formed on the uncoated backside, were removed, and Al2O3was etched through volatile hydroxides formed in water vapor (~10%). Overall, the test indicated exceptional stability of the YSZ/Al2O3/Ti2AlC system under turbine conditions due in large part to close thermal expansion matching.
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