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Improved tensile strength and toughness of dense C/SiC-SiBC with tailored PyC interphase.
- Source :
-
Journal of the European Ceramic Society . May2019, Vol. 39 Issue 5, p1766-1774. 9p. - Publication Year :
- 2019
-
Abstract
- Abstract In this study, in order to improve the tensile strength and toughness of dense C/SiC-SiBC, the thickness of PyC interphase (e PyC) was increased from 200 nm to 400 nm. C/SiC (e PyC ≈200 nm) was also fabricated as a benchmark comparison. C/SiC-SiBC (e PyC ≈200 nm) exhibited higher axial thermal residual stress (TRS) than C/SiC (e PyC ≈200 nm). Increased axial TRS resulted in increased interfacial shear strength (τ) through fiber bending, which caused lowered mechanical properties of C/SiC-SiBC (e PyC ≈200 nm). By increasing the thickness of PyC interphase from 200 nm to 400 nm, the axial TRS in C/SiC-SiBC decreased. Accordingly, the radial stress induced by fiber bending decreased, leading to a reduced τ in C/SiC-SiBC (e PyC ≈400 nm). Decreased axial TRS and τ are beneficial to the effective loading of fiber bundles and pull out of fibers. Therefore, C/SiC-SiBC (e PyC ≈400 nm) performed excellent tensile strength (250 ± 11 MPa) and fracture toughness (23.7 ± 0.5 MPa·m1/2). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09552219
- Volume :
- 39
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Journal of the European Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 134739911
- Full Text :
- https://doi.org/10.1016/j.jeurceramsoc.2019.01.006