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HomeKey Engineering MaterialsKey Engineering Materials Vol. 287The Effects of β-Si3N4 Whisker Content and...

The Effects of β-Si₃N₄ Whisker Content and Orientation on R-Curve Behaviors of Si₃N₄ Ceramics

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Abstract:

The b–Si3N4 whisker randomly and unidirectionally reinforced Si3N4 composites were fabricated respectively. The high whisker alignment was obtained by extrusion processing. The R-curve behaviors were studied for the Si3N4 ceramics with addition of 3wt%, 5wt% and 10wt% b–Si3N4 whisker seeds respectively, and the effects of whisker orientation and content on the R-curve behaviors were analyzed and discussed. The ceramics with different whisker content and orientation showed well-defined R-curve behaviors. However, for the whisker random distribution, as its whisker content increased from 3wt% to 10wt%, the corresponding fracture toughness changed at an irregular trend; for the whisker unidirectional reinforcement, the fracture toughness in the direction perpendicular to whisker alignment was considerably improved, and most of indentation impressions tend to be very abnormal. The effects of whisker orientation and contents on the R-curve behaviors of the Si3N4 ceramics were further discussed.

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Periodical:

Key Engineering Materials (Volume 287)

Pages:

404-409

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.287.404

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Online since:

June 2005

Authors:

Lin-Hua Zou, Dong Soo Park, Hai Doo Kim, Chang An Wang, Yong Huang

Keywords:

Ceramic, R-Curve Behaviour, Whisker Alignment

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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