ピッチをバインダーとする炭素繊維/炭素複合材

抄録

The condition to produce carbon fiber reinforced carbon composite (C/C composite) of high performance by hot-pressing has been investigated. Cutted carbon fiber clothes were dipped into the paste consisting of 30-40wt% binder pitch, 60-70wt% coke powder and 160wt% ethyl alcohol, so that the content of carbon fiber in the resulting C/C composite might be maintained at a constant value of about 60wt%. These caron fiber clothes were stacked in a mold and hot-pressed at the pressure of 8MPa in the temperature range from 390°C to 520°C. The hot-pressed product was carbonized at 1 000°C under nitrogen atmosphere, followed by the graphitization up to 2 500°C in argon. The resulting C/C composite has high flexural strength of 200MPa after a pitch impregnation treatment. It has been also confirmed that adequate temperature difference between upper and lower dies can effectively suppress the crack formation in the production of large size C/C composite by hot-pressing, probably due to the easiness of degasing.