采用扫描电镜、激光共聚焦显微镜观察和力学性能测定的方法, 研究了三维C/C复合材料微观结构形貌, 以及材料X向、Y向和Z向的压缩性能. 结果表明, 材料内部缺陷明显, 纤维束/基体界面结合较弱, 材料Z向压缩强度和破坏应变均大于X向和Y向, 压缩应力-应变曲线开始阶段近似线性, 随着载荷的增加, 曲线表现出明显的非线性特征. 从宏观上考察了材料的压缩破坏机制, 材料X向、Y向和Z向破坏模式均为剪切型破坏, 纤维/基体界面结合强度对破坏模式影响明显.
By means of scanning electronic microscope(SEM), laser scanning confocal microscope(LSCM)and mechanical properties measuring, the microstructure morphology and the compressive mechanical properties of the 3D C/C composite along X, Y and Z directions were studied. The results show that there are obvious defects, and there is weak adhesion in the fiber/matrix interface of the 3D C/C composite. The compressive strength and fracture strain along Z direction are all much greater than those along X direction and y direction. The compressive fracturemechanism of 3D C/C composite was also investigated based on the macro-pictures of the fracture surface ofspecimens. The results show that the compressive stress-strain curves exhibit the almost linear characteristics at the beginning, and show nonlinear characteristics with the time. Failure models of the samples under compressive load along X, Y and Z directions present shear fracture. The fiber/matrix interfacial strength has a great effect on the compressive failure mechanism.
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