Toward a Better Understanding of the Influence of the Hydrocarbon Precursor on the Mechanical Properties of a‐C:H Coatings Synthesized by a Hybrid PECVD/PVD Method
Bibliographic record
Abstract
In this work, we provide new insight on the influence of the precursor (CH4 vs. C2H2) on the mechanical properties of a‐C:H coatings synthesized in a hybrid PECVD/PVD process. For a given set of plasma parameters, the films synthesized in CH4/Ar gas mixture are found harder than the ones prepared in C2H2/Ar atmosphere despite their lower sp3 density and similar hydrogen content. This unusual behavior is attributed to different molecular organization of the polymeric network constituting the films. The latter is explained considering the influence of the chemical nature of the film‐forming species on the cross‐linking and branching degree of the films. The whole set of our results unambiguously demonstrates that additional factors than the sp3 and hydrogen content have to be considered for explaining the mechanical properties of a‐C:H layers.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 |
| 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 source (direct Gemma or distilled Codex), 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".