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- 2016
浸渍熔渗复合法制备Cf/HfC复合材料及其性能
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Abstract:
采用液相浸渍结合反应熔渗法制备了Cf/HfC复合材料。研究了浸渍效果、抗氧化烧蚀微粒分布形貌、熔渗效果与熔渗组织, 并考核了Cf/HfC复合材料的抗氧化烧蚀性能和力学性能。结果表明:经5次浸渍-碳化循环和1次高温处理工艺制备了含13wt%抗氧化烧蚀微粒的ZrB2+HfO2+TaSi2改性C/C预制体, 其密度和开孔率分别为1.41 g/cm3和24.84%, 微粒主要分布在纤维束之间的基体碳中, 且分布均匀。改性C/C预制体经过Hf35Zr10Si5Ta合金反应熔渗制备的Cf/HfC复合材料密度和开孔率分别为2.98 g/cm3和12.95%, 其线烧蚀率为0.017 1 mm/s, 弯曲强度为173.76 MPa, 断裂方式为假塑性断裂。 The Cf/HfC composite was prepared by liquid impregnation combined reactive melt infiltration technique. The impregnation efficiency, anti-oxidant and anti-ablation particles distribution morphology, infiltration efficiency and infiltration organization were studied, the antioxidant ablation property and mechanical properties of Cf/HfC composites were also assessed. Results show that the modified C/C preform which contains 13wt% ZrB2+HfO2+TaSi2 particles was obtained after five cycles of impregnation-carbonization and one high-temperature treatment process, the density and open porosity of which are 1.41 g/cm3 and 24.84%, respectively. Particles are mainly distributed in matrix carbon between fiber bundles, and the distribution is uniform. The Cf/HfC composites whose density and open porosity are 2.98 g/cm3 and 12.95%, was prepared after Hf35Zr10Si5Ta alloy reactively melt infiltrated modified C/C perform. The linear ablation rate is 0.017 1 mm/s, the flexural strength is 173.76 MPa, and the fracture mechanism is pseudo-ductile fracture. 国家自然科学基金(51302315)
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