Thermal stability of polycrystalline TiN/CrN superlattice coatings
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Bibliographic record
Abstract
This article reports the structure and hardness responses of TiN/CrN superlattice coatings to elevated-temperature annealing. Polycrystalline TiN/CrN superlattices with bilayer periods of 5.6–39 nm were deposited on a Ni-base alloy substrate by reactive unbalanced magnetron sputtering. The superlattices were subsequently annealed in vacuum at elevated temperatures for 2–100 h, followed by characterization using small-angle x-ray reflection, high-angle x-ray diffraction, and hardness testing. The superlattices can sustain their hardness up to 650 °C for 4 h or 575 °C for 100 h. A strong correlation exists between the hardness and the x-ray reflection or x-ray diffraction characteristics. A marked reduction in the high-angle satellite/Bragg peak ratio or in the small-angle reflection intensity corresponds to a rapid decrease in the hardness. This phenomenon is related to a physical transition during which the loss of hardness is caused by the structural instability resulting from accelerated interdiffusion between TiN and CrN layers, which leads to reduced compositional modulation amplitude and diffuse layer interfaces.
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it