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MECHANICAL PROPERTIES TEST OF 2D C/C COMPOSITES

机译：二维C / C复合材料的力学性能测试

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Using 2D needled-carbon fiber felt as the preform, carbon fiber reinforced carbon(C/C) composites were fabricated by isothermal chemical vapor infiltration (ICVI).The strength of flexural, shear and tensile were obtained by mechanical properties test equipment(model CMT5150) ,while influence of temperature and sample size on performance were studied, and the microstructure of composites was studied by X-ray diffraction and scanning electron microscopy. The results show that flexural strength in X-Y direction was higher than that of Z direction for the more content of carbon fiber in X-Y direction. Composites shows obvious pseudo-plastic in the X-Y direction while shows no distinct pseudo-plastic fracture in the Z direction due to more carbon fiber debonding and pullout in the X-Y direction. C/C composites have higher flexural strength above 1600°C, while the maximum fracture displacement increases with temperature, since the percent of porosity were the major factors which make the interface have different properties which exists between fibers and matrix. Within a certain range, the tensile strength of the material with lower interface shear strength are higher.
机译：以2D针状碳纤维毡为预成型件，通过等温化学气相渗透法（ICVI）制备碳纤维增强碳（C / C）复合材料，并通过力学性能测试设备（型号CMT5150）获得弯曲，剪切和拉伸强度），同时研究了温度和样品量对性能的影响，并通过X射线衍射和扫描电子显微镜研究了复合材料的微观结构。结果表明，随着碳纤维在X-Y方向上含量的增加，X-Y方向的弯曲强度高于Z方向。复合材料在X-Y方向上显示出明显的假塑性，而在Z方向上没有显示出明显的假塑性断裂，这是由于碳纤维在X-Y方向上的脱粘和拔出更多。 C / C复合材料在1600°C以上具有较高的抗弯强度，而最大断裂位移随温度而增加，这是因为孔隙率是导致界面在纤维和基体之间具有不同特性的主要因素。在一定范围内，界面抗剪强度较低的材料的抗拉强度较高。

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