中文摘要：

主要对比了编织C/C复合材料和针刺C/C复合材料的轴向热力学性能.编织C/C复合材料主要有径棒法、轴棒法、轴向穿刺三种,针刺C/C复合材料主要有炭布叠层针刺、整体毡两种.编织预制体密度较高,平均可达到0.70g/cm3以上,针刺类整体毡密度在0.20g/cm3左右,炭布叠层预制体密度在0.45g/cm3左右,均低于编织预制体.径棒法、轴棒法、轴向穿刺预制体轴向纤维含量≥19%,针刺类预制体轴向纤维含量约为5%.C/C复合材料的轴向拉伸强度、热膨胀系数与预制体编织结构、轴向纤维含量有关,编织类C/C复合材料轴向拉伸强度平均值≥40MPa,针刺类C/C复合材料轴向拉伸强度在10MPa左右.轴棒法、轴向穿刺、炭布叠层针刺、整体毡等四种C/C复合材料（RT～800℃）轴向热膨胀系数基本相当.

英文摘要：

Axial thermodynamic performance of braid carbon/carbon（C/C）composites and needle C/C composites is compared.Braid C/C composites comprises the radial rod preform composite,the axial rod preform composite and the fine woven punctured preform composite.Needle C/C composites consist of the whole felt preform composites and the carbon clothes/felt layer needling preform composites.The bulk density of the whole felt preform approximates 0.2g/cm3,and the carbon clothes/felt layer needling preform is about 0.45g/cm3.The density of needle preform is less than that of braid perform,which is up to 0.70g/cm3.Axial fiber content of braid preform is more than or equal to 19%,while that of needle preform is only 5%.The axial tensile strength and thermal expansion coefficient are related to the structure of preform and axial fiber content.The average axial tensile strength of braid C/C composites is ≥40MPa,and while the needle C/C composites is around 10MPa.The axial thermal expansion coefficient of the axial rod preform,the fine woven punctured preform,the whole felt preform and the carbon clothes/felt layer needle preform C/C composites is comparative in the range of RT-800℃.