A dense and fine-grained SiC/Ti₃Si(Al)C₂ composite and its high-temperature oxidation behavior

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• 作者：Shibo Li^a ; ^{shbli1@bjtu.edu.cn} ; Gui-Ming Song^b ; ^c ; Yang Zhou^a
• 关键词：Hot pressing ; Composites ; SiC/Ti3Si(Al)C2 ; Corrosion ; Glass
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：September, 2012
• 卷：32
• 期：12
• 页码：3435-3444
• 文件大小：3102 K

摘要

A dense SiC/Ti₃Si(Al)C₂ composite was synthesized by in situ hot pressing powders of Si, TiC and Al as a sintering additive at 1500 掳C for 2 h under 30 MPa in Ar atmosphere. This composite has a fine-grained and homogeneous microstructure with grain sizes of 5 渭m for Ti₃Si(Al)C₂ and of 1 渭m for SiC. The SiC/Ti₃Si(Al)C₂ composite possesses an improved oxidation resistance, with parabolic rate constants of 4.57 脳 10^鈭? kg²/m⁴/s at 1200 掳C and 1.31 脳 10^鈭? kg²/m⁴/s at 1300 掳C. This study provides an experimental evidence to confirm the formation of amorphous phases in the oxide scale of the SiC/Ti₃Si(Al)C₂ composite. Microstructure and phase composition of the SiC/Ti₃Si(Al)C₂ composite and oxide scales were identified by X-ray diffractometry and scanning electron microscopy. The mechanism for the enhanced oxidation resistance has been discussed.