Influence of post-spraying heat treatments on the oxidation and cracking behaviour of thermal-sprayed thermal barrier coatings
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Bibliographic record
Abstract
The durability of a thermal barrier coating (TBC) system is dominated by fracture near the interface between the ceramic topcoat and metallic bond coat, where a layer of thermally grown oxide (TGO) would form during service exposure. Even though the formation of a continuous alumina scale would help to protect the bond coat from further oxidation, the spontaneous formation of other mixed oxides such as spinel and nickel oxide are believed to be detrimental to TBC durability. The formation of such detrimental oxides may promote crack nucleation and accelerate crack propagation during thermal exposure, leading to premature TBC failure. The present study shows that post-spraying heat treatment in low-pressure oxygen environments can promote the formation of a thin alumina scale that suppresses the spontaneous formation of detrimental oxides during subsequent thermal exposure. This results in an improved oxidation resistance of the bond coat and, hence, it slows down crack propagation in the thermal-spray TBC systems. The relationship between the oxide scale growth and crack propagation is also established through extensive metallurgical examination, which serves as the basis for a TBC life prediction model.
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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 | 0.000 | 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 | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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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 it