C_f/BAS复合材料的氧化行为研究

Study on Oxidation Behaviors of C f/BAS Composites

采用热压工艺成功的合成了碳纤维／钡长石（Ｃｆ／ＢＡＳ）复合材料，研究了这种复合材料的氧化行为。结果表明，Ｃｆ／ＢＡＳ复合材料的氧化失重与基体微裂纹有关。基体中的微裂纹提供了氧化性气体的扩散通道，从而导致高温下碳纤维的严重氧化。随着时间的增加，氧化性气体沿内部碳纤维的扩散路径逐渐增加，残留碳纤维的氧化速度逐渐降低。Ｃｆ／ＢＡＳ在燃气中氧化后力学性能降低的幅度比在空气中降低小一些，这是由于燃气中的氧分压较低，纤维的氧化程度不如在空气严重。

Carbon fiber/celsian(C f/BAS) composites was prepared successfully by thermo pressure process and its oxidation behaviors were studied in this paper.The results show that the weight loss of C f/BAS composites is related to the microcracks in matrix.The microcracks in matrix are the diffusion passages of oxidizing gases at high temperature,which results in the serious oxidation of carbon fibers.The bending strength of C f/BAS decreases less apparently in combustion gas environment than in dry air,because the partial pressure of oxygen in combustion gas is lower than that in air.