Influence of B <sub>4</sub> C content and particle size on the mechanical properties of Al <sub>2</sub> O <sub>3</sub> ‐B <sub>4</sub> C composites
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Bibliographic record
Abstract
Abstract Alumina (Al 2 O 3 ) ceramics and their composites are widely used in the cutting tool industries due to their superior mechanical properties. This study presents a comprehensive investigation of the influence of B 4 C content and particle size on the sinterability, microstructure, and mechanical properties of Al 2 O 3 ‐B 4 C composites fabricated using Spark Plasma Sintering (SPS). The relative density of the composites increased and residual porosity decreased as the B 4 C particle size in the powder blends decreased. The addition of B 4 C particles improved the mechanical properties of monolithic Al 2 O 3 and the highest property enhancements were obtained for the composite with 30 vol% of the finest B 4 C particles. For this composition, with respect to monolithic Al 2 O 3 , the density was reduced by 11% and hardness, Young's modulus, indentation fracture toughness, and flexural strength increased by 24%, 8%, 51%, and 88%, respectively. The effect of the B 4 C particle size on the Young's modulus in relation to existing micromechanical models reveals that the composites with a fine B 4 C particles fit the Reuss model.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.002 | 0.001 |
| 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 it