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Wu, Han ; Chen, Zhe ; Yan, Wen ; Schafföner, Stefan ; Wu, Guiyuan ; Dai, Yajie ; Li, Yawei:
A novel lightweight periclase-composite (Mg₈₋ₓFeₓ₊ᵧAl₁₆₋ᵧO₃₂) spinel refractory material for cement rotary kilns.
In: Ceramics International.
Bd. 48
(2022)
Heft 1
.
- S. 615-623.
ISSN 1873-3956
DOI: https://doi.org/10.1016/j.ceramint.2021.09.140
Abstract
This study presents novel lightweight periclase-composite (Mg8-xFex + yAl16-yO32) spinel refractories (LPSR) for the high temperature zone of cement rotary kilns. The LPSR was prepared by using microporous magnesia aggregates instead of sintered magnesia aggregates in traditional periclase-composite spinel refractories (TPSR). Hercynite-corundum composite aggregates, as well as microporous magnesia aggregates with a median pore size of 3.50 μm and a 20.1% lower bulk density than those of the sintered magnesia aggregates were used as raw materials. The microstructures, fracture behavior and strength of the LPSR in contrast with those of the TPSR were determined by SEM and three-point bending tests. After substituting the microporous magnesia aggregates for the sintered magnesia aggregates, a rougher surface of the microporous aggregates and wider transition-layer containing a solid solution spinel phase at the microporous magnesia aggregate/composite spinel aggregate interfaces were observed. Thus, a better bonding at the microporous magnesia aggregate/matrix interfaces as well as of the microporous magnesia aggregate/composite spinel aggregate interfaces was achieved. The wider transition-layer and better interfaces impeded crack propagation along the aggregate/matrix interface and increased the percentage of crack propagation within the aggregates. Thus, the mechanical strength of the LPSR was significantly enhanced. Compared with the TPSR, the LPSR had a lower bulk density of 2.56 g/cm3, but also a higher apparent porosity of 27.8% and a higher compressive strength of 46.4 MPa.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | Lightweight periclase-composite (Mg8-xFex+yAl16-yO32) spinel refractories; Microporous magnesia aggregates; Hercynite-corundum composite aggregates; Microstructure; Strength |
| 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 09:30 |
| Letzte Änderung: | 31 Mär 2023 09:30 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/75739 |