Abstract
Elastic constants and tensile behaviour of chemical vapour infiltration processed 2.5D Cf/SiC composites possessing multilayered (PyC/SiC)n=4 interphase, Si-B-C containing matrix and SiC seal-coating have been evaluated with microstructural examination and damage assessment. The strength obtained as ∼187 ± 2 MPa in tensile tests at 27 °C is increased by ∼18% and ∼22% at 1000 °C and 1250 °C, respectively due to reduced thermal stress and increased strength of load-sharing C-fibres, which are protected from oxidation till failure by a self-healing borosilicate layer. The damage evolving during tension tests has been quantified by relating it to decrease of stress-strain slope with strain. Higher (6–8 times) elastic constants measured along fibre-axes than that obtained transversely, indicate significant anisotropy. Owing to matrix cracking with fibre-debonding and pull-out, the fibre-oriented elastic constants of tensile-fractured samples are significantly lower than those of as-received composites, and the difference scales with temperature, whereas negligible change is observed perpendicular to the fibre axes.
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