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将CVD法增密至1.34g/cm3和1.61g/cm3的两组试样热处理后进行力学性能测试;作为对比,将另外两组起始密度相近的样品经过树脂补充增密至1.80g/cm3以上,经热处理后也作了力学性能检测。检测结果发现,对纯CVD法增密的试样来说,密度高的样品的力学性能值也较高;树脂浸渍补充增密后,样品的力学性能明显优于纯CVD的低密度试样,浸前CVD起始密度高的样品的力学性能值也相对较高。对材料的力学性能初步分析认为,C/C复合材料的力学性能和失效方式不仅受材料密度的影响,而且也受基体炭种类、性能,如可石墨化,热处理温度等因素影响。相同条件下,石墨化度高的样品力学性能值偏低。
Two sets of samples which were densified to 1.34g / cm3 and 1.61g / cm3 by CVD method were tested for their mechanical properties after heat treatment. For comparison, two samples with similar initial densities were densified to 1.80g / cm3 Above, after heat treatment also made mechanical properties testing. The results showed that the mechanical properties of the samples with higher density were higher for the samples with pure CVD method. The mechanical properties of the samples after the impregnation with resin impregnation were obviously better than that of the pure CVD samples with low density. The mechanical properties of samples with high initial CVD density before immersion are also relatively high. The mechanical properties of the material preliminary analysis that the mechanical properties and failure modes of C / C composites are not only affected by the density of the material, but also by the substrate carbon types, properties such as graphitization, heat treatment temperature and other factors. Under the same conditions, the samples with high graphitization degree have lower mechanical properties.