三向正交预制体织造参数对C/C复合材料性能的影响

以Z向间距不同的三向正交结构预制体为研究对象，采用化学气相渗透和浸渍树脂相结合的工艺制备碳/碳(C/C)复合材料，研究织造参数对C/C复合材料微观结构和弯曲性能的影响。以三向正交预制体最小的重复结构为单元建立计算模型，获得三向正交预制体纤维含量与织造参数的关系式并进行验证，结果表明：Z向纤维间距及X，Y向纤维层间距越小，预制体纤维含量越高；Z向纤维间距越大，纤维交织处扭曲变形大，预制体孔隙结构发生变化；相同致密化工艺下，孔隙结构的变化影响C/C复合材料中基体碳的组成和分布，对基体碳形貌无影响；X，Y向纤维含量越高，Z向纤维间距越小，致密后的C/C复合材料弯曲强度越高。

Effect of three-directional orthogonal preform weaving parameters on properties of C/C composites

Taking the three-directional orthogonal preform with different Z-direction fiber distance as the research object, the carbon/carbon (C/C) composites were prepared by the combination of chemical vapor infiltration and resin impregnation, and the effect of weaving parameters on the microstructure and bending performance of C/C composites were studied. The calculation model was established by taking the smallest repeated structure of three-directional orthogonal preform as a unit, and the relationship between fiber content and weaving parameters of three-directional preform was obtained and verified. The results show that the fiber content of preform is increased with the decrease of Z-direction fiber distance and X, Y-direction fiber layer distance; when the Z-direction fiber distance is increased, the twist deformation of the fiber interweave becomes larger, resulting in the change of the pore structure of the preform; under the same densification process, the change of pore structure affects the composition and distribution of carbon matrix in C/C composites, but has no effect on the morphology of carbon matrix; when the fiber content in X, Y-direction is increased and the distance between fibers in Z-direction is decreased, the flexural strength of the C/C composites is higher.