Abstract
Commercial carbon felt preforms modified by micro‑carbon particles and nano‑carbon dots were used to fabricate C/C composites by directional pulsed gas flow TG-CVI method. Microstructure, fracture morphology, phase constitution and degree of crystallization of the composites were characterized by polarized light microscopy (PLM), scanning electron microscopy (SEM), X-ray diffractometry (XRD) and Laser confocal Raman microscopy (RMS), respectively. Flexural strength and fracture toughness of the composites was tested by universal electronic testing machine. Results showed that the pyrolysis carbon structure of C/C composites changed from smooth layer to rough layer after the preform was modified by the carbon dots or particles. The degree of graphitization increased from 2.33% of Cf-0/C to 22.09% of Cf-0.05/C; the corresponding fracture mode changed from brittle fracture to pseudo-plastic fracture, and flexural strength slightly decreased.
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