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Durability of YSZ coated Ti 2 AlC in 1300°C high velocity burner rig tests
Author(s) -
Smialek James L.,
Cuy Michael D.,
Harder Bryan J.,
Garg Anita,
Rogers Richard B.
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17154
Subject(s) - materials science , yttria stabilized zirconia , thermal barrier coating , cubic zirconia , coating , superalloy , composite material , durability , spallation , combustor , phase (matter) , hot isostatic pressing , calcination , alloy , ceramic , combustion , chemistry , catalysis , physics , organic chemistry , quantum mechanics , biochemistry , neutron
Abstract A 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 Ti 2 AlC‐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; Al 2 O 3 ‐scale growth produced a slight 2.4 mg/cm 2 mass gain. The coating surface exhibited craze‐cracked colonies of [111] flourite textured 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. TiO 2 nodules, initially formed on the uncoated backside, were removed, and Al 2 O 3 was etched through volatile hydroxides formed in water vapor (~10%). Overall, the test indicated exceptional stability of the YSZ/Al 2 O 3 /Ti 2 AlC system under turbine conditions due in large part to close thermal expansion matching.