浸渍熔渗复合法制备C_f/HfC复合材料及其性能  

Preparation and property of C_f/HfC composites by liquid impregnation combined reactive melt infiltration

作　　者：白宏德[1] 张虹[1] 叶益聪[1] 

机构地区：[1]国防科学技术大学航天科学与工程学院,长沙410073

出　　处：《复合材料学报》2016年第6期1259-1265,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51302315)

摘　　要：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C_f/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ZrB_2+HfO_2+TaSi_2改性C/C预制体,其密度和开孔率分别为1.41g/cm^3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C_f/HfC复合材料密度和开孔率分别为2.98g/cm^3和12.95%,其线烧蚀率为0.017 1mm/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 tech-nique.The impregnation efficiency,anti-oxidant and anti-ablation particles distribution morphology,infiltration effi-ciency 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 treat-ment process,the density and open porosity of which are 1.41 g/cm^3 and 24.84%,respectively.Particles are main-ly 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/cm^3 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.

关 键 词：液相浸渍 反应熔渗 C_f/HfC复合材料 抗烧蚀 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]