219 Strength of Carbon Bonding between C/C Composites at Elevated Temperatures

概要

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Increased use of Carbon/Carbon composites (C/Cs) has necessitated fabrication of complex structures made of the C/Cs. To satisfy this requirement, secondary bonding technique effective at elevated temperatures should be developed. In the present study, carbon and SiC bonding between C/Cs were examined. The bonding strength and Inter-Laminar shear strength (ILSS) of C/Cs were evaluated at elevated temperatures up to 2273K in vacuum using double-notched specimens. The results revealed that both of bonding strength increased with increasing temperature. Strength of graphite has reported to be affected by absorbed water. Hence, bonding strength tests were also performed for the carbon-bonded specimens with and without evaporation treatment of absorbed water. These results indicate that the evaporation of absorbed water is a predominant factor for increasing carbon-bonding-strength with temperature. Other major factor was identified to be thermal stress during bonding process caused by mismatch of thermal expansion between substrate C/C and bonding region. This effect was quantitatively analyzed by finite element method (FEM).