Abstract: As one of the precursors for the preparation of C/C composites, carbon fiber reinforced phenolic resin matrix composites have been widely used in almost every aspect of modern industry nowadays. Studying the carbonization performance of a novel high-carbon phenolic resin and its composites can effectively promote the production and application C/C composites. We investigated the carbonization properties of high carbon phenolic resin and its composites under different temperatures. It shows that high carbon phenolic resin has the same structure as normal phenolic resin. At 199 ℃, the solidification of high carbon phenolic resin can reach the fastest rate. TGA test result shows that this resin has higher carbon residue rate at 1000 ℃ in N₂. The carbonization properties of this resin and its carbon fiber reinforced composites were also studied. The results show that high carbon phenolic resin has a higher residual carbon ratio than the ordinary phenolic resin. Only when the temperature exceeds 1000 ℃, the carbonization process of this resin can be fully carried out. However, when the carbonization temperature is too high, the decomposed same carbon particles will deposit into larger one. Of course, these particles contains only a very small amount of graphite grains, and most of them are amorphous and irregular. Similarly, when it comes to its composites, the large particles produced at higher temperatures will influence the contents of apparent and closed porosities in composites. When the composites are carbonized under 1000 ℃, they can obtain the best apparent porosities. This is benefit for their subsequent processes.

Key words: high carbon phenolic resin, carbonization performance, C/C composite, porosity