Changes in Crystallinity of Gas-phase Oxidized PAN-based Carbon Fibers
Why this work is in the frame
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Bibliographic record
Abstract
Carbon fibers are being increasingly used in many industries such as leisure, aviation, aerospace, military, and energy due to their outstanding characteristics Using polyacrylonitrile as a precursor, PAN-based carbon fibers undergo electrospinning, stabilization, and carbonization to become lightweight, high-strength carbon fibers At high temperatures, carbon fibers experience a deterioration of physical properties, which results in various issues Recently, extensive research has been performed to overcome such issues, and a fundamental step is to understand and analyze the oxidation reactions of carbon fibers This study conducted gas-phase oxidation of PAN-based carbon fibers at 700 in air to examine changes in crystallinity in relation to oxidation reactions. The raw materials used were Toray's T300 and T700. After removing sizing materials at 400 in a tube furnace, gas-phase oxidation (Air, 0.5L/min) was carried out at 700 over varying times. An X-ray diffractometer was used to examine the crystallinity of gas-phase oxidized carbon fibers. Based on the XRD spectrum, the peaks were separated to calculate the (002) interplanar distance, La, and Lc. The Lc and (002) interplanar distance increased with burn-off amount, and this is attributed to the small crystallites being oxidized before others. The rate of increase of Lc was higher for T300 than T700, and T3 had a smaller Lc at the start of oxidation. The smaller Lc allowed oxidation to take place more rapidly, thereby contributing to the faster rate of increase of Lc.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 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) | 0.000 | 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