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Fabrication of SiCf/SiC composites by chemical vapor infiltration and vapor silicon infiltration
- Source :
-
Materials Letters . Aug2010, Vol. 64 Issue 15, p1691-1693. 3p. - Publication Year :
- 2010
-
Abstract
- Abstract: Three-dimensional (3D) silicon carbide fiber reinforced silicon carbide matrix (SiCf/SiC) composites, employing KD-1 SiC fibers (from National University of Defense Technology, China) as reinforcements, were fabricated by a combining chemical vapor infiltration (CVI) and vapor silicon infiltration (VSI) process. The microstructure and properties of the as prepared SiCf/SiC composites were studied. The results show that the density and open porosity of the as prepared SiCf/SiC composites are 2.1g/cm3 and 7.7%, respectively. The SiC fibers are not severely damaged during the VSI process. And the SiC fibers adhere to the matrix with a weak interface, therefore the SiCf/SiC composites exhibit non-catastrophic failure behavior with the flexural strength of 270MPa, fracture toughness of 11.4MPa·m1/2 and shear strength of 25.7MPa at ambient conditions. Moreover, the flexural strength decreases sharply at the temperature higher than 1200°C. In addition, the thermal conductivity is 10.6W/mk at room temperature. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 0167577X
- Volume :
- 64
- Issue :
- 15
- Database :
- Academic Search Index
- Journal :
- Materials Letters
- Publication Type :
- Academic Journal
- Accession number :
- 51810250
- Full Text :
- https://doi.org/10.1016/j.matlet.2010.05.013