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Zhou, Wenying ; Yan, Wen ; Ma, Sanbao ; Schafföner, Stefan ; Dai, Yajie ; Li, Yawei:
Degradation mechanisms of periclase-magnesium aluminate spinel refractory bricks used in the upper transition zone of a cement rotary kiln.
In: Construction and Building Materials.
Bd. 272
(2021)
.
- 121617.
ISSN 1879-0526
DOI: https://doi.org/10.1016/j.conbuildmat.2020.121617
Abstract
In this study, the degradation mechanisms of dense periclase-magnesium aluminate spinel refractory bricks used in the upper transition zone of cement rotary kilns were investigated by XRD, SEM and EDS. And the results indicated that the damage of the used brick was main due to the structural spalling as well as the formation and extension of cracks, caused by the corrosion of cement clinker, the deposition of alkali salts and thermal stress resulted from changing temperature field. The bricks reacted with the cement clinker forming a liquid phase at the reacting interface, and then the penetration of this liquid phase by reaction sintering altered the microstructure and compositions of bricks. Additionally, the constantly changing temperature field and the precipitation of alkali salts with the high thermal expansion coefficient in colder zones led to tremendous thermomechanical stress. Thus, joint effects of these factors caused the structural spalling and deterioration of refractory linings.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | Degradation mechanisms; Periclase-magnesium aluminate spinel refractory; Cement rotary kiln; Cement clinker and alkali salts |
| 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 09:58 |
| Letzte Änderung: | 31 Mär 2023 09:58 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/75766 |