Study on microstructures and mechanical properties of short-carbon-fiber-reinforced SiC composites prepared by hot-pressing

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:527

Article

He, Xiulan¹  Guo, Yingkui¹  Yu, Zemin¹  Zhou, Yu²  Jia, Dechang² 

[1] Harbin Univ Sci & Technol, Dept Mat Sci & Engn, Harbin 150040, Peoples R China

[2] Harbin Inst Technol, Dept Mat Sci & Engn, Harbin 150001, Peoples R China

关键词: Short-carbon-fiber-reinforced SiC composites;    Polycarbosilane;    Hot-pressing;    Microstructure;    Mechanical property;   

DOI  :  10.1016/j.msea.2009.08.004

来源: Elsevier

【 摘 要 】

Short-carbon-fiber-reinforced silicon carbide composites were prepared by hot-pressing with SiC powder, Polycarbosilane as precursor polymer and MgO-Al2O3-Y2O3 as sintering additives. The phase composition, microstructure and mechanical properties of the composites with different Polycarbosilane content were investigated. The results showed that, dense composites could be prepared at a relatively low temperature of 1800 degrees C via the liquid-phase-sintering mechanism and the highest mechanical property was obtained for the composites with 20wt.% PCS and 8wt.% sintering additives. The amorphous interphase formed during sintering process in the composites not only contributed to the densification of the composites, but also improved the fiber-matrix bonding. The nano-silicon carbide derived from Polycarbosilane, could also play a role of improving the relative density of the composites. (C) 2009 Elsevier B.V. All rights reserved.

【 授权许可】

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