C_f/SiC复合材料制备过程对碳纤维的损伤

Damage of Carbon Fiber during the Preparing of C_f/SiC Composites

对几种类型的碳纤维在Cf/SiC复合材料制备工艺中的先驱体中氧含量及高温热处理和PCS浸渍裂解处理过程中造成的损伤进行了考察,并探讨了损伤机制。结果表明,碳纤维石墨化程度和表面状态的差别会对其在复合材料制备过程中的损伤程度产生影响。石墨化程度高的M40JB碳纤维损伤程度较大;表面呈活性的JC1#碳纤维对外界条件的变化较为敏感;而石墨化程度不高而表面不活泼的JC2#碳纤维则损伤程度较小且较稳定。

The damage of different carbon fibers was studied from high temperature, infiltration and pyrolysis of Polycarbosilane (PCS), and the oxygen in PCS. The result shows that the graphitizing extent and surface status influence the damage of carbon fiber greatly. The carbon fiber M40JB with a higher graphitizing extent was damaged more seriously; the carbon fiber JC1# with an active surface was sensitive to the variation of outside condition; however, the carbon fiber JC2#, which had a lower graphitizing extent and not active surface, was damaged less and was more stable. 