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采用径向针刺工艺制备了近净尺寸针刺C/C喉衬预制体,通过热梯度CVI和树脂浸渍碳化复合工艺对预制体进行了致密,利用μ-CT、光学显微仪表征了C/C喉衬材料微观孔隙和热解碳织构,分析了喉衬材料的弯曲性能。结果表明,径向针刺过程形成的损伤型孔隙通道与碳源气体传输方向一致,提高了碳源气体传输效率,使径向针刺喉衬CVI增密效率比传统轴向针刺喉衬提高10.9%。预制体近净尺寸成型缩短了烧蚀区域碳源气体的渗透距离,喉衬材料烧蚀区域形成了高织构热解碳,有利于喉衬烧蚀性能的提高。径向针刺喉衬的轴向弯曲强度比轴向针刺喉衬提高150%.
The near-net size needle-punched C / C throat lining preform was prepared by radial needle-punching process. The preform was dense by thermal gradient CVI and resin-impregnated carbonized composite process. The morphology of the preform was characterized by μ-CT and optical microscope / C throat lining material microscopic pores and pyrolysis carbon texture, the analysis of the throat lining material bending performance. The results show that the damage-type pore channels formed by radial acupuncture process are consistent with the carbon source gas transmission direction, which improves the carbon source gas transmission efficiency and enhances the densification efficiency of radial acupuncture throat lining CVI compared with the traditional axial acupuncture throat lining 10.9%. Near-net shape forming of the preform shortens the permeation distance of carbon source gas in the ablation area, and highly textured pyrolytic carbon is formed in the ablation area of the lining material, which is favorable for improving the ablation performance of the throat lining. Radial acupuncture throat axial bending strength than the axial acupuncture throat lining increased by 150%.