Abstract
Several SiC/SiC composites reinforced with a highly crystalline β-SiC fiber, Tyranno-SA, were fabricated using the chemical vapor infiltration (CVI) process. The flexural properties and fracture behaviors were investigated using three-point bending tests. Various pyrolytic carbon (PyC) or multi-interlayers were deposited in the composites using an isothermal CVI process to modify the interfacial bonding and fiber sliding resistance. The bending test results revealed a close PyC layer dependence of the flexural strength. The ultimate strength showed quick increase with the increasing of the PyC layer thickness up to ∼100nm, beyond which slight increase of the ultimate strength via the PyC layer thickness till ∼200mn was noticed. The interfacial shear strengths (ISS) of these composites were extracted with single fiber pushout tests, which revealed very large ISS from ∼195MPa to over 633MPa depending on the thickness of the PyC layer.
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