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R-Curve Behaviour of Alumina Matrix Ceramics with Long Cracks

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Abstract:

The R-curve (KR versus crack length c) behavior has been examined in alumina-10 wt% zirconia ceramics with 3 mol% yttria stabilized zirconia, alumina-10 wt% zirconia ceramics with 12 mol% nano ceria stabilized zirconia and Al2O3-30 wt% Ti(C,N) ceramics. An observation of in situ microscopic long-through thickness crack growth during three point bending (3PB) of a single edge notched beam (SENB) enabled measurement of the R-curve. It was found that both aluminazirconia ceramics with yttria or ceria stabilized zirconia exhibit a rising R-curve while for Al2O3-30 wt% Ti(C,N) ceramics such relationship was not observed. Moreover the slow crack growth parameters (n, logA) were determined by means of load-relaxation technique for tested alumina matrix ceramics.

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Periodical:

Advances in Science and Technology (Volume 45)

Pages:

1652-1657

DOI:

https://doi.org/10.4028/www.scientific.net/AST.45.1652

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Online since:

October 2006

Authors:

Magdalena Szutkowska, Marek Boniecki, Mirosław M. Bućko

Keywords:

Alumina Matrix Ceramics, Fracture Toughness, R-Curves, Slow Crack Growth

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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