Fabrication and mechanical properties of carbon fibers/lithium aluminosilicate ceramic matrix composites reinforced by in-situ growth SiC nanowires
| Autor: | Xiaoxiao Huang, Longnan Huang, Long Xia, Guangwu Wen, Chi Wang, Bo Zhong, Li Xiong, Hua Yang |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Nanowire chemistry.chemical_element Sintering 02 engineering and technology 021001 nanoscience & nanotechnology Ceramic matrix composite Microstructure 01 natural sciences Fracture toughness chemistry Flexural strength Aluminosilicate 0103 physical sciences Materials Chemistry Ceramics and Composites Lithium Composite material 0210 nano-technology |
| Zdroj: | Journal of the European Ceramic Society. 39:4625-4633 |
| ISSN: | 0955-2219 |
| Popis: | To improve the mechanical properties of carbon fibers/lithium aluminosilicate (Cf/LAS) composites, Cf/LAS with in-situ grown SiC nanowires (SiCnw-Cf/LAS) were prepared by chemical vapor phase reaction, precursor impregnation, and hot press sintering, consecutively. The effect of multi-scaled reinforcements (micro-scaled Cf and nano-scaled SiCnw) on the mechanical properties was investigated. The phase composition, microstructure and fracture surface of the composites were characterized by XRD, Raman Spectrum, SEM, and TEM. The morphology of SiCnw has a close relation with the content of Si. Microstructure analysis suggests that the growth of SiC nanowires depends on the VLS mechanism. The multi-scale reinforcement formed by Cf and SiCnw can significantly improve the mechanical properties of Cf/LAS. The bending strength of SiCnw-Cf/LAS reaches to 597 MPa, achieving an increase of 19% to Cf/LAS. Moreover, the samples show a maximum fracture toughness of 11.01 MPa m1/2, achieving an increase of 46.4% to Cf/LAS. Through analysis of the fracture surface, the improved mechanical properties could be attributed to the multi-scaled reinforcements by the pull-out and debonding of Cf and SiCnw from the composites. |
| Databáze: | OpenAIRE |
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