Axial Thermodynamic Performance Analysis of the Different Preform C/C Composites

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℃.