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Chen, Zhe ; Yan, Wen ; Schafföner, Stefan ; Li, Yawei ; Li, Nan:
Microstructure and mechanical properties of lightweight Al₂O₃-C refractories using different carbon sources.
In: Journal of Alloys and Compounds.
Bd. 862
(2021)
.
- 158036.
ISSN 0925-8388
DOI: https://doi.org/10.1016/j.jallcom.2020.158036
Abstract
Two lightweight Al2O3-C refractories containing microporous corundum aggregates were fabricated by using flake graphite and microcrystalline graphite as the carbon source. The effect of these carbon sources on the microstructure and mechanical properties of lightweight Al2O3-C refractories with a silicon additive was then investigated. Using microcrystalline graphite resulted in more SiC whiskers in the microporous corundum aggregates compared to the specimens using flake graphite because microcrystalline graphite had a higher reactivity. The higher amount of SiC whiskers led to a more intertwined and compacter microporous aggregate/matrix interface structure. Due to the improved microporous aggregate/matrix interface together with the reinforcing effect of the well-developed SiC whiskers, the crack propagation along the aggregate/matrix interface was suppressed, whereas the percentage of cracks propagating within the aggregates was enhanced. Therefore, the lightweight Al2O3-C refractories using microcrystalline graphite had a similar apparent porosity of 24.5%, a similar bulk density of 2.71 g/cm3 but a 14.3% increased cold modulus of rupture (25.6 MPa), a higher fracture energy and a somewhat higher toughness than the ones using pricier flake graphite. Overall, the study provides a framework for the industrial application of lightweight Al2O3-C refractories with significantly improved mechanical properties.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Keramische Werkstoffe Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Keramische Werkstoffe > Lehrstuhl Keramische Werkstoffe - Univ.-Prof. Dr.-Ing. Stefan Schafföner |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 31 Mär 2023 09:51 |
| Letzte Änderung: | 31 Mär 2023 09:51 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/75760 |