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针对酚醛先驱体C/C复合材料液相浸渍制备工艺各组分相的化学转化特性,基于Arrhenius方程建立了C/C复合材料液相浸渍制备工艺力学模型,详细分析了固化-炭化和石墨化两个重要的工艺阶段各组分相的体积变化规律,得到的气孔体积分数与Micro-CT系统扫描处理的细编穿刺C/C复合材料微结构图像中气孔体积分数相吻合,并结合均匀化方法对制备过程材料基体有效弹性模量进行了预测。结果表明:材料基体的有效弹性模量随着致密化次数的增加而增大,在每一次致密化过程中材料基体的有效弹性模量先增大后减小,石墨化工艺过程中材料基体的有效弹性模量达到某一值后保持平稳。
Aiming at the chemical conversion characteristics of each phase in liquid phase impregnation process of phenolic precursor C / C composites, the mechanical model of liquid phase impregnation preparation of C / C composites was established based on Arrhenius equation. The effects of curing-carbonization and graphitization The volume change regularity of each component phase in two important process stages and the pore volume fraction coincided with the pore volume fraction in fine structure punctured C / C composite microstructure image scanned by Micro-CT system. Methods The effective elastic modulus of the material matrix during the preparation was predicted. The results show that the effective elastic modulus of the material matrix increases with the increase of the number of densification. The effective elastic modulus of the matrix first increases and then decreases with each densification. The matrix of the material matrix during the graphitization process The effective modulus of elasticity reaches a certain value and remains stable.