Enhanced mechanical properties of lightweight Al2O3-C refractories reinforced by combined one-dimensional ceramic phases

被引:17
作者
Chen, Zhe [1 ]
Yan, Wen [1 ,3 ]
Schaffoener, Stefan [2 ]
Li, Yawei [1 ,3 ]
Nath, Mithun [1 ,3 ]
Zhu, Chengyi [1 ]
机构
[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, 947 Heping Rd, Wuhan 430081, Peoples R China
[2] Univ Bayreuth, Dept Ceram Mat Engn, Bayreuth, Germany
[3] Wuhan Univ Sci & Technol, Natl Prov Joint Engn Res Ctr High Temp Mat & Lini, Wuhan, Peoples R China
关键词
crack propagation; lightweight Al2O3-C refractories; microporous corundum aggregates; SiC whiskers; strength; WALLED CARBON NANOTUBES; CONTINUOUS-CASTING REFRACTORIES; SILICON-CARBIDE WHISKERS; THERMAL-SHOCK RESISTANCE; THERMOMECHANICAL PROPERTIES; BONDED ALUMINA; SIC WHISKERS; MICROSTRUCTURES; TEMPERATURE; COMPOSITE;
D O I
10.1111/ijac.13933
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We prepared a new lightweight Al2O3-C refractory material with a higher strength by using microporous corundum aggregates instead of dense tabular corundum aggregates, which was reinforced by in situ formed SiC whiskers, multi-walled carbon nanotubes (MWCNTs), and mullite rods. A comparative study of the microstructure, mechanical properties, and fracture behavior was carried out for dense and lightweight Al2O3-C refractories coked at 1200 degrees C and 1400 degrees C, respectively. By using the microporous corundum aggregates, a better aggregate/matrix interface bonding and an optimized distribution of SiC whiskers were obtained. The SiC whiskers formed inside the microporous corundum aggregates and simultaneously in the matrix by a vapor-solid reaction mechanism, resulting in an enhancement at the microporous aggregate/matrix interface. Furthermore, the in situ formed MWCNTs and well-developed mullite rods at 1200 degrees C in the matrix also contributed to the better interface structure. Thus, due to the improved microporous aggregate/matrix interface, the crack propagation along the aggregate/matrix interface was suppressed, resulting in an increased crack propagation within the aggregates. Consequently, the synergy between microporous corundum aggregates and combined one-dimensional ceramic phases caused a lower bulk density but a markedly higher strength, a higher fracture energy, and a higher toughness of lightweight Al2O3-C refractories compared to the dense ones. Overall, our study allows to overcome the traditional concept that a higher strength of refractories is reached by a higher density.
引用
收藏
页码:1613 / 1625
页数:13
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