The Role Of Thermally Grown Oxide In The Failure Thermal Barrier Coatings For Gas Turbine Engine Applications
Bibliographic record
Abstract
Thermal barrier coatings (TBCs) are widely used in gas turbine engines for propulsion and power generation to maximize engine operating temperature and fuel efficiency. TBCs comprise primarily three major components: the ceramic top coat, the intermetallic bond coat and a thin layer of a thermally grown oxide (TGO) formed at the bond coat/top coat interface. It was demonstrated that the TGO layer plays a critical role in determining the TBC life time with many TBC failure events occurring with its direct involvement. However, the actual mechanisms that govern TBC degradation and failure are still not fully understood in terms of the TGO role and the effects of its properties on the failure process. Stress analysis and TBC life time modelling were used in this study to demonstrate that the TGO morphology, its specific mechanical and thermal properties significantly affect the degradation modes and failure behaviour of the entire TBC system while the particular failure mechanisms differ depending on the ceramic top coat fabrication process. In this paper, the effect of changes in the TGO layer during thermal cycling has been theoretically investigated for TBC with top coats fabricated by atmospheric plasma spray and electron be am physical vapour deposition and the differences in their degradation and failure have been discussed.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".