摘要
分别以密度为1.26 g/cm^3和1.46 g/cm^3的C/C复合材料作为基体材料,用有机硅和乙酸锆作为先驱体,采用先驱体浸渍裂解法(precursor infiltration pyrolysis,PIP)制备C/C-SiC-ZrC复合材料,利用X射线衍射仪(XRD)、扫描电镜(SEM)和能谱分析(EDS)等检测手段分析该复合材料的成分和微观结构,研究C/C基体密度对材料抗压强度、线膨胀系数以及抗烧蚀性能的影响。结果表明,C/C基体密度为1.46 g/cm^3时C/C-SiC-ZrC复合材料的抗压强度较高(146.36 MPa)、线膨胀系数较小。C/C基体密度为1.26 g/cm^3的C/C-SiC-ZrC复合材料具有更优的抗烧蚀性能,经过30 s烧蚀后,其质量烧蚀率和线烧蚀率分别为-2.9×10-4g/s和1.7×10-3 mm/s,这主要是因为C/C基体密度较低时,材料中的陶瓷含量更高,当烧蚀发生时,能更快地在材料表面形成SiO_2-ZrO_2氧化物薄膜,从而减缓材料内部基体的进一步烧蚀。
C/C-SiC-ZrC composites were fabricated by precursor infiltration pyrolysis （PIP） using C/C composites with the densities of 1.26 g/cm^3 and 1.46 g/cm^3, respectively, as the matrix materials, and organic silicon and zirconium acetate as the precursors. The composition and morphology of the composites were characterized by X-ray diffraction meter （XRD）, scanning electron microscope （SEM） and energy dispersive spectrometer （EDS）. The effect of C/C density on compression strength, coefficient of linear expansion and ablation resistance were investigated. The results showed that the C/C-SiC-ZrC composites with C/C density of 1.46 g/cm^3 had the superior compression strength and lower coefficient of linear expansion. After ablation for 30 s, the C/C-SiC-ZrC composite with C/C density of 1.26 g/cm^3 showed the better ablation resistance. Its mass and linear ablation rates were -2.9 × 10^-4 g/s and 1.7 × 10^-3 mm/s, respectively. This was mainly because the content of ceramic is higher in C/C-SiC-ZrC composites when the density of C/C was lower. As a result, the SiO2-ZrO2 oxides film were formed on the surface of the composites more quickly when the ablation occurred. Then it could retard the further ablation of the substrate.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2016年第6期907-916,共10页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(51304249)
湖南省自然科学基金资助项目(14JJ3023)
湖南省战略性新兴产业重大科技攻关项目(2014GK1017)
中南大学粉末冶金国家重点实验室资助项目
