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Enhancing the tensile properties of SiC composites by a two-dimensional CNT film.
- Source :
-
Ceramics International . Feb2021, Vol. 47 Issue 3, p4111-4117. 7p. - Publication Year :
- 2021
-
Abstract
- Tensile properties of silicon carbide (SiC) ceramics were improved by introducing a two-dimensional carbon nanotube film (CNT f) with excellent mechanical properties. CNT f was first assembled by floating catalyst chemical vapor deposition (CCVD); then CNT f with the pyrolytic carbon interfacial layer (CNT f /PyC) was prepared by chemical vapor infiltration (CVI). Afterwards, SiC was infiltrated into the CNT f and CNT f /PyC preforms by the CVI process, to prevent the uneven dispersion and agglomeration of CNT and damage caused by high temperature sintering. Two composites (CNT f /SiC, CNT f /PyC/SiC) were ultimately prepared, and their microstructures and tensile properties were studied. The results show that the tensile strengths of CNT f /PyC, CNT f /SiC and CNT f /PyC/SiC are 716 ± 60, 153 ± 11, and 155 ± 12 MPa, respectively, which illustrates that SiC ceramic reinforced by CNT f exhibits excellent tensile properties. Besides, the porosities of CNT f /SiC and CNT f /PyC/SiC are 17.4% and 22.6%, respectively. CNT f /PyC/SiC shows higher porosity but better tensile properties, indicating that the PyC interfacial layer enhances the tensile properties of CNT f /SiC composite. In addition, the strengthening and toughening mechanisms are also discussed. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CHEMICAL vapor deposition
*CARBON films
*CARBON fibers
*PYROLYTIC graphite
Subjects
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 47
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 147718130
- Full Text :
- https://doi.org/10.1016/j.ceramint.2020.09.287