| Autor: |
Mengmeng Yang, Jijia Li, Yiran Man, Zijun Peng, Xiaofang Zhang, Xudong Luo |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Materials & Design, Vol 186, Iss , Pp - (2020) |
| Druh dokumentu: |
article |
| ISSN: |
0264-1275 |
| DOI: |
10.1016/j.matdes.2019.108334 |
| Popis: |
In this study, a novel hollow alumina sphere-based ceramic enhanced by in situ mullite whisker framework was recommended. Hollow alumina spheres selected as the main pore-forming agent were bonded together by an active mullite powder at high temperature. To improve the mechanical properties of the hollow alumina sphere-based ceramic, AlF3 powder was added into the active mullite powder to fabricate the mullite whisker framework during the sintering process. The mechanical properties of as-received hollow alumina spheres ceramic can be tailored by the sintering procedure. The results indicated that the sample sintered at 1400 °C exhibited a low bulk density of 1.005 g/cm3 and a low thermal conductivity of 0.656 W/mK. The high aspect ratio of mullite whisker interacting with each other formed a unique framework structure, which enhanced the flexure strength (reaching 5.05 MPa) of the sample. Keywords: Hollow alumina sphere, Mullite whisker, Interlocked framework, Porous ceramic, Binding agent |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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Full Text from ScienceDirect