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采用X射线衍射仪和原子荧光分析仪对石墨化处理前后准三维C/C复合材料的石墨化程度及其所含的汞、砷、铅和镉元素含量进行了分析。在氩气保护条件下经过2400℃2 h石墨化处理的C/C复合材料所含以上元素含量较低,更适宜作为外科植入材料使用。利用电子力学试验机在不同准静态应变率和加载方向条件下,对石墨化处理后C/C复合材料进行了压缩断裂试验研究,采用光学体视显微镜和扫描电子显微镜对该材料的断口形貌进行观察分析。结果表明,C/C复合材料具有压缩应变率效应,增强纤维阻止裂纹扩展和增韧效果明显。材料的抗压强度(28.30 MPa~83.25 MPa)和弹性模量(257.56 MPa~397.06 MPa)可以满足其作为骨修复材料的使用要求。
The degree of graphitization and the contents of mercury, arsenic, lead and cadmium in the quasi-three-dimensional C / C composites before and after graphitization were analyzed by X-ray diffraction and atomic fluorescence spectrometry. The C / C composites with a graphitization at 2400 ℃ for 2 h under argon protection have the lower content of the above elements and are more suitable for use as surgical implants. The C / C composites after graphitization were subjected to the compression fracture test by using the electro-mechanical testing machine at different quasi-static strain rates and loading directions. The fracture morphology of the C / C composites was analyzed by optical stereo microscope and scanning electron microscope For observation and analysis. The results show that the C / C composites have the effect of compressive strain rate, and the effect of reinforcing fibers to prevent crack growth and toughening is obvious. The compressive strength (28.30 MPa ~ 83.25 MPa) and elastic modulus (257.56 MPa ~ 397.06 MPa) of the material can meet the requirements of its use as a bone repair material.