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3d C/C Processing with High Gas Pressure

Published online by Cambridge University Press:  15 February 2011

S. E. Hsu,
C. I. Chen and
S. T. Chou
S. E. Hsu
Affiliation:
Materials Research and Development Center, CSIST, Lungtan,Taiwan 32526 Republic of China
C. I. Chen
Affiliation:
Materials Research and Development Center, CSIST, Lungtan,Taiwan 32526 Republic of China
S. T. Chou
Affiliation:
Materials Research and Development Center, CSIST, Lungtan,Taiwan 32526 Republic of China
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Abstract

Carbon/Carbon composite is densified by Hipping infiltrated pitch. The pore size in matrix decreased as processing pressure increases. The porosity decreasing rate is defined as (Vi−Vi+ 1)/Vi, and is proportional to the applied gas pressure, where Vi and Vi+1 are the pore volume before and after hipping respectively. The bonding strength also increases with the applied gas pressure and with densification cycle. The density of a 67% porosity fiber preform can reach up to 1.9 g/cm3 in less than 6 hipping cycles with maximum gas pressure of 103 Mpa.

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References

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