C/C–SiC composite prepared by Si–10Zr alloyed melt infiltration
C/C–SiC composite prepared by Si–10Zr alloyed melt infiltration
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DOI：
10.1016/j.ceramint.2011.12.038
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发表时间：
2012-05
影响因子：
5.2
通讯作者：
Y. Tong;S. Bai;H. Zhang;Ke Chen
中科院分区：
文献类型：
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作者：
Y. Tong;S. Bai;H. Zhang;Ke Chen
采用Si-10 Zr合金熔渗法制备了高性能、低成本的C/C-SiC复合材料。采用热解炭化学气相渗透法对碳纤维毡进行致密化处理，得到多孔C/C预制体。共晶Si-Zr合金熔体（Zr：10at.%，Si：90原子%）在1450°C条件下，将C/C-SiC复合材料渗透到多孔预制体中，制备了C/C-SiC复合材料。由于热解碳与Si-Zr合金之间的原位反应，生成了SiC、ZrSi 2和ZrC相，并从热力学角度研究了它们的形成和分布。C/C-SiC复合材料的抗弯强度为353.6MPa，表现为假韧性断裂行为。与C/C预制体和高密度C/C复合材料相比，C/C-SiC复合材料具有更好的抗氧化性能，在1400°C空气中氧化20 min后，C/C预制体失重36.5%，而高密度C/C复合材料失重84%。C/C-SiC复合材料表面生成了ZrO 2、ZrSiO 4和SiO2，有效地保护了材料的抗氧化性能。
A high performance and low cost C/C–SiC composite was prepared by Si–10Zr alloyed melt infiltration. Carbon fiber felt was firstly densified by pyrolytic carbon using chemical vapor infiltration to obtain a porous C/C preform. The eutectic Si–Zr alloyed melt (Zr: 10at.%, Si: 90at.%) was then infiltrated into the porous preform at 1450°C to prepare the C/C–SiC composite. Due to the in situ reaction between the pyrolytic carbon and the Si–Zr alloy, SiC, ZrSi2and ZrC phases were formed, the formation and distribution of which were investigated by thermodynamics. The as-received C/C–SiC composite, with the flexural strength of 353.6MPa, displayed a pseudo-ductile fracture behavior. Compared with the C/C preform and C/C composite of high density, the C/C–SiC composite presented improved oxidation resistance, which lost 36.5% of its weight whereas the C/C preform lost all its weight and the high density C/C composite lost 84% of its weight after 20min oxidation in air at 1400°C. ZrO2, ZrSiO4and SiO2were formed on the surface of the C/C–SiC composite, which effectively protected the composite from oxidation.