ZrC改性C/C-SiC复合材料的力学和抗烧蚀性能
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摘要
采用碳纤维针刺预制体,用前驱体浸渍裂解(PIP)法分别制备了C/C-SiC和C/C-SiC-ZrC陶瓷基复合材料,并对材料的微观结构、力学和烧蚀性能进行了分析对比。结果表明:利用该方法可制备出陶瓷相填充充分且分布均匀的复合材料。C/C-SiC-ZrC的面内弯曲强度、厚度方向的压缩强度、层间剪切强度均低于对应的C/C-SiC的。2 200℃、600s氧化烧蚀后,C/C-SiC-ZrC的抗烧蚀性能显著优于C/C-SiC,其线烧蚀率下降43.8%,质量烧蚀率下降25%。在超高温阶段,C/C-SiC-ZrC复合材料基体的ZrC氧化生成的ZrO2溶于SiC氧化生成的SiO2中,形成黏稠的二元玻璃态混合物,有效阻止了氧化性气氛进入基体内部。
Carbon fiber needling preform was used to prepare C/C-SiC and C/C-SiC-ZrC ceramics matrix composites by precursor infiltration and pyrolysis(PIP)process respectively.The microstructure,mechanical and ablation properties of materials were analyzed and compared.The results show that the composites produced by the method have sufficient filling and homogeneity distribution of ceramic phase.The in-plane flexural strength,compression strength through thickness direction and interlaminar shear strength of C/C-SiC-ZrC are all lower than the corresponding properties of C/C-SiC.C/C-SiC-ZrC shows better anti-ablative preformances compared with C/C-SiC after ablation at 2 200 ℃for 600 s,the linear ablation rate is reduced by 43.8% and the mass ablation rate is reduced by25%.During ultra-high temperature stage,the ZrC and SiC in the matrix of C/C-SiC composites are oxidized into ZrO2 and SiO2,which form a kind of viscous binary glassy mixture.The mixture could effectively prevent oxidizing atmosphere into the matrix.
Carbon fiber needling preform was used to prepare C/C-SiC and C/C-SiC-ZrC ceramics matrix composites by precursor infiltration and pyrolysis(PIP)process respectively.The microstructure,mechanical and ablation properties of materials were analyzed and compared.The results show that the composites produced by the method have sufficient filling and homogeneity distribution of ceramic phase.The in-plane flexural strength,compression strength through thickness direction and interlaminar shear strength of C/C-SiC-ZrC are all lower than the corresponding properties of C/C-SiC.C/C-SiC-ZrC shows better anti-ablative preformances compared with C/C-SiC after ablation at 2 200 ℃for 600 s,the linear ablation rate is reduced by 43.8% and the mass ablation rate is reduced by25%.During ultra-high temperature stage,the ZrC and SiC in the matrix of C/C-SiC composites are oxidized into ZrO2 and SiO2,which form a kind of viscous binary glassy mixture.The mixture could effectively prevent oxidizing atmosphere into the matrix.
引文
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[5]LI X T,SHI J L,ZHANG G B,et al.Effect of ZrB2on the ablation properties of carbon composites[J].Materials Letters,2006,60(7):892-896.
[6]TANG S F,DENG J Y,WANG S J,et al.Ablation behaviors of ultrahigh temperature ceramic composites[J].Materials Science&Engineering A,2007,465(1-2):1-7.
[7]TONG Q F,SHI J L,SONG Y Z,et al.Resistance to ablation of pitchderived ZrC/C composites[J].Carbon,2004,42(12-13):2495-2500.
[8]SUN W,XIONG X,HUANG B Y,et al.ZrC ablation protective coating for carbon/carbon composites[J].Carbon,2009,47(14):3368-3371.
[9]刘巧沐,张立同,成来飞,等.C/SiC-ZrC复合材料在甲烷燃气环境中的氧化行为[J].复合材料学报,2011,28(4):108-111.LIU Q M,ZHANG L T,CHENG L F,et al.Oxidation behaviors of C/SiC-ZrC composites in a CH4combustion gas environment[J].Acta Materiae Compositae Sinica,2011,28(4):108-111(in Chinese).
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[11]SHEN X T,LI K Z,LI H J,et al.Microstructure and ablation properties of zirconium carbide doped carbon/carbon composites[J].Carbon,2010,48(2):344-351.
[12]GAO X Q,LIU L,GUO Q G,et al.The effect of zirconium addition on the microstructure and properties of chopped carbon fiber/carbon composites[J].Composies Science and Technology,2007,67(3-4):525-529.
[13]WANG Q F,HU H F,CHEN Z H.Effects of ZrC content on microstructure and properties of 2DC/SiC-ZrC composites via precursor infiltration and pyrolysis[J].Journal of Aeronautical Materials,2009,29(4):72-76.
[14]FANG D,CHEN Z F,SONG Y D,et al.Morphology and microstructure of 2.5dimension C/SiC composites ablated by oxyacetylene torch[J].Ceramics International,2009,35(3):1249-1253.
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