【摘要】 采用金属盐溶液浸渍-TCVI(Thermal Gradient Chemical Vapor Infiltration)法制备了HfC改性炭／炭复合材料。通过氧-乙炔烧蚀实验测试了不同含量HfC改性炭／炭复合材料的抗烧蚀性能;利用DSC-TG,SEM,XRD分析了HfC的形成过程、材料烧蚀前后的微观形貌及物相组成。结果表明:HfC的加入降低了炭／炭复合材料的线烧蚀率,其中HfC含量为6．5％(质量分数,下同)的炭／炭复合材料的线烧蚀率最低。HfC具有抑制氧化及弥补缺陷的作用,从而降低了炭／炭复合材料的热化学烧蚀和机械剥蚀。更多还原

【Abstract】 Carbon/carbon composites(CVC) with different amounts of HfC were prepared by the metal salts solution dipping-thermal gradient CVI method. Their ablation properties were tested in oxyacetylene flame with the gas of high velocity. The forming of HfC in C/C composites was investigated by DSC-TG method. The microstructure was studied by SEM, EDS and XRD. It was found that the liner ablation rate of HfC modified Carbon/Carbon composite is much lower than that of the carbon/carbon composites without HfC modified, because the HfC restrained the oxidization of carbon in composites and repaired the gaps on ablation, resulted in the decrease of thermochemical ablation and mechanical erosion of the composites.更多还原