| Autor: |
Gongyuan Liu, Hajin Oh, Md Hafijur Rahman, Jing Du, William Windes, Aman Haque |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
C, Vol 10, Iss 3, p 76 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2311-5629 |
| DOI: |
10.3390/c10030076 |
| Popis: |
Polycrystalline graphite contains multi-scale defects, which are difficult to anneal thermally because of the extremely high temperatures involved in the manufacturing process. In this study, we demonstrate annealing of nuclear graphite NBG-18 at temperatures below 28 °C, exploiting the electron wind force, a non-thermal stimulus. High current density pulses were passed through the specimens with a very low-duty cycle so that the electron momentum could mobilize the defects without heating the specimen. The effectiveness of this technique is presented with a significant decrease in electrical resistivity, defect counts from X-ray computed tomography, Raman spectroscopy, and nanoindentation-based mechanical characterization. Such multi-modal evidence highlights the feasibility of nanoscale defect control at temperatures about two orders of magnitude below the graphitization temperature. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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