采用超声波真空浸渍-碳热还原法将ZrB2引入碳纤维预置体, 结合热梯度化学气相渗透、高温石墨化工艺制备了ZrB2改性C/C复合材料. 氧-乙炔烧蚀测试结果表明, 添加了6.87 wt% ZrB2后, C/C复合材料的线烧蚀率和质量烧蚀率分别下降了64.9%和67.5%. 分析表明, C/C复合材料的烧蚀主要是由热化学和热物理反应控制, 机械剥蚀在烧蚀过程中仅起到次要作用. 烧蚀产物ZrO2/B2O3在烧蚀过程中的挥发会带走大量的热, 从而减少了烧蚀火焰对烧蚀表面的热冲击.
ZrB2 was first introduced into carbon preforms through ultrasonic and vacuum immersion-carbonthermal reduction method. After densification using thermal gradient chemical vapor in-ltration and graphitization, ZrB2 doped C/C composites were prepared. The oxyacetylene ablation results show that the linear and mass ablation rates of the composites after doping with 6.87wt% ZrB2 decreased by 64.9% and 67.5%, respectively. The ablation of C/C composites is mainly controlled by thermochemical and thermophysical reactions and mechanical denudation does not play a dominant role. The evaporation of ZrO2/B2O3 during ablation would take away large amounts of heat, reducing the thermal impact of flame to the ablation surface.
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