Toughening of ZrB2-based composites with in-situ synthesized ZrC from ZrO2 and graphite precursors
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Bibliographic record
Abstract
ZrB2 matrix composites toughened with in-situ formed ZrC were fabricated by spark plasma sintering (SPS) utilizing ZrB2/ZrO2/graphite powder mixtures at 1900 °C for 7 min under 40 MPa load. Different amounts of graphite nano-flakes (3, 6, and 9 wt%) were added to ZrB2–20 vol% ZrO2 aiming in-situ formation of ZrC reinforcement. Clean ZrB2/ZrC interfaces were observed in the as-sintered microstructure, especially in the composite containing 6 wt% graphite. The reduction of ZrO2 with graphite, which formed ZrC, was progressed over a zirconium oxycarbide (ZrCxOy) intermediate. The hardness of the SPSed ZrB2-based composites was decreased with increasing the graphite content. However, the fracture toughness of the composites showed a reverse trend. By adjusting the graphite content to 6 wt%, excellent control of microstructure could be achieved for the prepared composites with a higher amount of ZrC and lower content of other unfavorable phases. It was finally found that achieving the optimum microstructure of the composite could improve its mechanical performance, and provides a hardness of 17.3 GPa and fracture toughness of 5.0 MPa m1/2.
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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 | 0.001 | 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 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| 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)
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