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SiC fiber reinforced SiBCN ceramic matrix composites (CMCs) have been prepared by mechanical alloying and consolidated by hot pressing. During the sintering process, amorphous SiC fibers crystallized seriously and transformed into β-SiC. Meanwhile, the interfacial carbothermal reactions caused the strong bonding between the matrix and fibers. As a result, SiCf/SiBCN fractured in a typical catastrophic manner. Room-temperature mechanical properties reached the maximums for the CMC samples sintered at 1900 ℃/60 MPa/30 min. The density, flexural strength, Young’s modulus and fracture toughness are 2.56±0.02 g/cm3, 284.3±17.9 MPa, 183.5±11.1 GPa and 2.78±0.14 MPa·m1/2, respectively.


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Microstructure and mechanical properties of SiCf/SiBCN ceramic matrix composites

Show Author's information Jiaying WANGZhihua YANGXiaoming DUANDechang JIA( )Yu ZHOU
Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150080, China

Abstract

SiC fiber reinforced SiBCN ceramic matrix composites (CMCs) have been prepared by mechanical alloying and consolidated by hot pressing. During the sintering process, amorphous SiC fibers crystallized seriously and transformed into β-SiC. Meanwhile, the interfacial carbothermal reactions caused the strong bonding between the matrix and fibers. As a result, SiCf/SiBCN fractured in a typical catastrophic manner. Room-temperature mechanical properties reached the maximums for the CMC samples sintered at 1900 ℃/60 MPa/30 min. The density, flexural strength, Young’s modulus and fracture toughness are 2.56±0.02 g/cm3, 284.3±17.9 MPa, 183.5±11.1 GPa and 2.78±0.14 MPa·m1/2, respectively.

Keywords:

hot pressing, composites, mechanical properties, fiber
Received: 29 August 2014 Accepted: 17 September 2014 Published: 31 January 2015 Issue date: March 2015
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Publication history
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Publication history

Received: 29 August 2014
Accepted: 17 September 2014
Published: 31 January 2015
Issue date: March 2015

Copyright

© The author(s) 2015

Acknowledgements

This work has been supported by the National Natural Science Funds for Distinguished Young Scholar of China under Grant No. 51225203. This work was also supported by the National Natural Science Foundation of China under Grant Nos. 51072041, 50902031 and 51021002. The authors also appreciated the meaningful comments from Dr. Pengfei Zhang.

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