Effects of preform structure on mechanical properties of carbon-carbon composite for nozzle exit cone

Three types of carbon fiber reinforced preforms such as carbon cloth ply perform (P preform), needled caborn cloth preform (N preform) and braided carbon fiber perform (B preform) were designed to prepare carbon-carbon exit cone of nozzle, and the effects of the preform structures on the mechanical properties of carbon-carbon composite were compared and investigated. The results show that for same density C/C exit cone composite, interlaminar shear strength (ILSS) of C/C composite prepared by P preform has the lowest value, but ILSS of C/C composite prepared by N preform reaches the highest value. The high-temperature bending properties of C/C composite prepared by three types of preforms are almost the same, and N preform structure is more appropriate for preparation and forming of C/C exit cone composite.