Internal corundum growth in alumina-silica refractory during exposure to molten Al-5Mg alloy
Bibliographic record
Abstract
The present work is aimed at clarifying the internal degradation processes of an alumina-silica refractory through microstructural observations and analysis after exposure to a molten Al-5Mg alloy for an extended period. An alumina-silica crucible was pretreated by a molten Al-5Mg alloy to cause the initial stage of degradations at the inner crucible surface. Fresh alloy was melted in the pretreated crucible and held at 1150˚C for 96 hrs to cause further degradations into the crucible wall. Results indicate that Mg reacts with aggregate (Al6Si2O13, SiO2) and matrix materials to form MgAl2O4, Si, Al, and Al-Si-Ca intermetallic compounds that were crystallized around MgAl2O4 to form network-like structures. In the absence of Mg, Al reacts with the aggregate to produce Si and αAl2O3 and reacts with calcium-aluminum silicate in the matrix to form Si and CaO-Al2O3 compounds. These indicate that MgAl2O4 spinel forms preferentially before the corundum (αAl2O3) formation. Mg and Ca, segregated at the interface of " αAl2O3 / Al6Si2O13" or "αAl2O3 / SiO2", may promote corundum formation. The lower concentration of O and Si in the degraded areas in comparison with those in un-degraded areas suggests that gaseous SiO might have been generated during the degradation processes.
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How this classification was reachedexpand
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 | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".