Efforts were made on recycling carbon fiber (CF) from carbon fiber reinforced epoxy resin (CF/EP) composite by pyrolysis and reused to rapid fabricate 2D C/C composite in this work, which provides a new direction for high-value reusing recycled carbon fiber (rCF). The results showed that a small amount of pyrolytic carbon was retained in rCF, but the rCF was not markedly damaged and kept comparable properties to virgin carbon fiber (vCF) after pyrolysis treatment. The rCF was subsequent used to rapid fabricate 2D C/C composite though moulding method. No significant negative effect of pyrolytic carbon on densification of rCF C/C composite was observed and there was no obvious structural defect within the rCF C/C composite. The as-obtained rCF C/C composite has a comparable flexural strength of 90.25 MPa with that of the vCF C/C composite of 95.45 MPa. Both the rCF C/C and vCF C/C composite exhibited a pseudo-ductile fracture behavior after reaching the maximum value of the stress-deflection curves. Surprisingly that the pyrolytic carbon has no fatal effect on the mechanical properties of the prepared rCF C/C composite, which is expected to be used as substitute in certain fields.

努力通过热解从碳纤维增强环氧树脂（CF / EP）复合材料中回收碳纤维（CF），并将其重新用于快速制造2D C / C复合材料，这为高价值地回收再生碳提供了新的方向光纤（rCF）。结果表明，少量的热解碳保留在rCF中，但rCF并未受到明显破坏，并且在热解处理后仍保持与原始碳纤维（vCF）相当的性能。随后，通过成型方法将rCF用于快速制造2D C / C复合材料。没有观察到热解碳对rCF C / C复合材料的致密化有明显的负面影响，并且在rCF C / C复合材料内没有明显的结构缺陷。如此获得的rCF C / C复合材料的抗弯强度为90.25 MPa，而vCF C / C复合材料的抗弯强度为95。45兆帕。在达到应力-挠度曲线的最大值之后，rCF C / C和vCF C / C复合材料均表现出拟延性断裂行为。令人惊讶的是，热解碳对所制备的rCF C / C复合材料的机械性能没有致命影响，该复合材料有望在某些领域用作替代品。