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将活性填料Al应用到吉林碳纤维(JC)和M40JB纤维增强先驱体转化SiC陶瓷基复合材料的制备中。研究表明,经过7个周期的致密化处理,当复合材料素坯中不含活性填料时,JC增强复合材料比M40JB增强复合材料有更高的弯曲强度,因此,JC纤维更适合用作先驱体转化陶瓷基复合材料的增强纤维;当复合材料素坯中含有活性填料Al时,由于Al与碳纤维发生碳化反应,使纤维受损,在纤维与基体之间形成不良的界面结合,导致复合材料的强度发生退化。图象分析表明,M40JB与Al的反应层厚度约为0.94μm。为了防止碳纤维与Al发生反应,应对碳纤维进行适当的表面处理。
The active filler Al was applied to the preparation of Jilin Carbon Fiber (JC) and M40JB fiber reinforced precursor conversion SiC ceramic matrix composites. The results show that after 7 cycles of densification, JC composites have higher flexural strength than M40JB reinforced composites when the composites are free of active fillers. Therefore, JC fibers are more suitable as precursors When the composite material containing the active filler Al, the carbon due to Al and carbon fiber carbonization reaction, the fiber damage, the fiber and the matrix formed between the poor interface, resulting in the composite material Degradation of intensity. Image analysis shows that the thickness of the reaction layer between M40JB and Al is about 0.94 μm. In order to prevent the reaction of carbon fiber with Al, carbon fiber should be properly surface treatment.