炭化MFCの炭素前躯体樹脂への添加によるC／C複合材料の機械的特性の向上

摘要

The purpose of this study is to propose an effective technique to improve the mechanical properties of C/C composites by adding carbonized MFC into carbon precursor. In this study, conventional CFRP was carbonized at 1,000℃ with inert atmosphere to fabricate the C/C composites in which pyrocarbon matrix was made from phenolic resin. Effect of weight content of carbonized MFC on the bending strength was discussed. The modified C/C composites were mechanically characterized by using a universal testing machine and mercury porosimeter. Test results showed that the significant improvement in the bending strength was appeared at condition of 1.0 wt% of addition, while the excessive addition of carbonized MFC was not effective to improve the bending strength. The morphology evaluation of fracture surface was revealed that the fiber braking was observed at the condition of 1.0 wt% of addition, while delamination was appeared on that of unmodified, 3.0 and 5.0 wt% of carbonized MFC addition. The SEM observation also revealed that local bridging of carbonized MFC was effective to improve the modell fracture toughness evaluated by ENF (End Notch Failure) test when the lwt% of carbonized MFC was added.%炭素繊維強化炭素複合材料（以下C／C複合材料）rnは，強化繊維を炭素，マトリクスを炭素とするセラrnミック基複合材料の一種であり，高温下で使用されrnる構造材料として他の材料にはみられない優れた特rn徴を有し，高温での強度が要求される車輪用プレーキディスクや航空機用材料に用いられている．rnしかしC／C複合材料は層間のせん断強度や破壊じんrn性が低く，構造物の設計上の大きな問題点である．