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Effect of La2O3 Content on Mechanical Properties and Toughened Mechanics of SiC Nanowires Toughened Cw/SiC Composites

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Abstract:

In this paper, micrometers long and 20–100nm diameter SiC nanowires had been synthesized in the Cw/SiC composites by annealing treatment. The present work demonstrated that it is possible to fabricate in-situ SiC nanowires toughening Cw/SiC composites. La2O3 had a significant effect on the morphology and distribution of the SiC nanowires in the Cw/SiC composites. The excess lanthanum resulted in the growth of SiC nanowires with an increasing growth rate in the longitudinal direction and a decreasing growth rate in radial direction. The addition of La2O3 would improve the mechanical properties in the room-temperature. The vapor–liquid-solid growth mechanism of the SiC nanowires along <111> direction was proposed. The combination of grain bridging, crack deflection, whisker debonding and SiC nanowires can improve fracture toughness.

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Periodical:

Materials Science Forum (Volume 650)

Pages:

119-125

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.650.119

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Online since:

May 2010

Authors:

Yun Long Zhang, Yu Min Zhang, Jie Cai Han

Keywords:

Composite, Mechanical Property, SiC Nanowire

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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