C/C-SiC composite prepared by Si-10Zr alloyed melt infiltration

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• 作者：Yonggang Tong ; ^{tygiaarh419@163.com} ; Shuxin Bai ; Hong Zhang ; Ke Chen
• 关键词：B. Composites ; C. Mechanical properties ; D. SiC ; Microstructure
• 刊名：Ceramics International
• 出版年：2012
• 出版时间：May, 2012
• 年：2012
• 卷：38
• 期：4
• 页码：3301-3307
• 全文大小：1180 K

文摘

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: 10 at. % , Si: 90 at. % ) was then infiltrated into the porous preform at 1450 ¡ãC to prepare the C/C-SiC composite. Due to the in situ reaction between the pyrolytic carbon and the Si-Zr alloy, SiC, ZrSi₂ and 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 353.6 MPa, 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 20 min oxidation in air at 1400 ¡ãC. ZrO₂, ZrSiO₄ and SiO₂ were formed on the surface of the C/C-SiC composite, which effectively protected the composite from oxidation.