预制体结构对C/C喷管出口锥材料力学性能的影响

设计了3种用于制备喷管用C/C出口锥材料的炭纤维增强预制体,即炭布铺层骨架(P型预制体)、炭布叠层原位针刺骨架(N型预制体)、炭纤维整体编织骨架(B型预制体),并对比研究了预制体结构对C/C出口锥材料力学性能的影响。结果表明,对同密度水平的C/C出口锥,用P型预制体制备的C/C材料的层剪强度最低,N型预制体制备的材料的层剪强度最高,B型预制体制备的材料的层剪强度居中。3种预制体制备的C/C材料的高温弯曲性能差别不大,N型预制体结构更适合于C/C出口锥材料的制备成型。

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 preform(P preform),needled caborn cloth preform(N preform)and braided carbon fiber preform(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.