The Influence of Chromium Oxide on the Sintering Behavior of Silicon Nitride
Why this work is in the frame
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Bibliographic record
Abstract
In this study, pressureless sintering of silicon nitride via the addition of chromium oxide was investigated. Silicon nitride samples containing additives from the Cr – Cr 2 O 3 – SiO 2 system were sintered under different conditions. The phase transformation, the degree of densification and the in situ reactions between Si 3 N 4 and chromium compounds were investigated and the reactions were validated thermodynamically. It was found that Si 3 N 4 reacts with Cr 2 O 3 and Cr and these in situ reactions lead to Si 3 N 4 decomposition and consequently formation of a series of chromium silicides including Cr 3 Si , Cr 5 Si , and CrSi 2 . Due to the presence of chromium silicides as liquid phases during sintering, the α‐ Si 3 N 4 to β‐ Si 3 N 4 phase transformation started around 1400°C and was completed around 1800°C. On the other hand, densification of Si 3 N 4 samples with chromium oxide addition was not observed. The participation of Cr 2 O 3 in these in situ reactions prevents sufficient formation of chromium silicate and leads to insufficient liquid phase with poor wettability during sintering, resulting in poor densification.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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