1. Brittleness reduction of Al2O3–C refractories: Microstructure evolution and role of carbon fibers.
- Author
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Wu, Zihao, Chen, Junfeng, Miao, Zheng, Yan, Junjie, Liu, Cheng, Yan, Wen, Zhang, Yu, Zhang, Shaowei, and Li, Nan
- Subjects
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THERMAL shock , *MICROSTRUCTURE , *ALUMINUM oxide , *REFRACTORY materials - Abstract
Carbon fibers (C f) were incorporated into Al 2 O 3 –C refractories to enhance their toughness in this work. The results indicated the 0.3 wt% C f -adding improved the high-temperature bending strength to 1.93 MPa from 1.07 MPa, and led to a 55 % enhancement in thermal shock resistance. The above enhancement could attributed to the in-situ formed SiC coating which was observed on the carbon fiber's surface and strengthened the interface bonding between the carbon fiber and refractory matrix. A solid-liquid diffusion reaction was employed to describe the formation process of in-situ SiC layer on the carbon fibers. Furthermore, the wedge-splitting test with digital images was carried out to investigate the crack-growth trajectory during the splitting process. It was confirmed that C f -adding could enhance the strength and reduce brittleness with the crack-bridging, pullout, and interlock behaviors of carbon fibers in the refractory matrix. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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