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通过针刺与化学气相沉积分别制备碳纤维预制体与碳基体,获得针刺C/C复合材料。研究了针刺密度、针刺深度、网胎面密度等预制体成型工艺参数对C/C复合材料力学性能的影响,并探讨了预制体体积密度与C/C复合材料力学性能关联关系。结果表明,针刺密度在20~50针/cm2之间时,C/C复合材料拉伸强度先增后减,而层间剪切强度一直上升;针刺深度在10~16 mm之间时,拉伸强度和层间剪切强度随针刺深度的提高而增加;网胎面密度在100~300 g/m2之间时,拉伸强度和层间剪切强度随网胎面密度的提高而降低;当只改变针刺密度、针刺深度、网胎面密度其中一个成型参数时,拉伸强度和层间剪切强度受预制体密度影响显著,预制体密度可作为预测C/C复合材料力学性能的一个宏观成型参数。
Carbon fiber preform and carbon matrix were prepared by acupuncture and chemical vapor deposition, respectively, to obtain acupuncture C / C composites. The effects of preform forming parameters such as needle punching density, depth of needle penetration and mesh tread density on the mechanical properties of C / C composites were studied. The relationship between bulk density and the mechanical properties of C / C composites was also discussed. The results showed that when the needle punching density was between 20 and 50 needles / cm2, the tensile strength of C / C composites increased first and then decreased, while the interlaminar shear strength increased all the time. When the depth of needle penetration was between 10 and 16 mm , Tensile strength and interlaminar shear strength increase with the depth of needle penetration; tensile strength and interlaminar shear strength increase with the increase of net tread density when mesh tread density is between 100 ~ 300 g / m2 While the tensile strength and interlaminar shear strength were significantly affected by the preform density when only one of the forming parameters such as needle punching depth, needling depth and mesh tread density were changed. The preform density could be used as the predictive C / C composite A macro forming parameter of mechanical properties of materials.