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Subcritical crack growth in partially stabilized ZrO2(MgO)

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Abstract

The room temperature slow crack growth resistance in air (≈ 50% relative humidity) and in water for large cracks in MgO-partially stabilized zircoba (PSZ) improves with increase in critical fracture toughness,K lc. Ageing the as-fired PSZ at 1400° C for 8 h results in decreasing Klc from 8.5 MPa m1/2 to 6 M Pa M1/2. The ageing treatment also promotes the growth of eutectoid decomposition products on grain boundaries that is accompanied by a decrease in the dependence (A the change in Region I crack velocity with a change in the applied stress intensity. Calculated times to failures are markedly decreased in the aged as compared to the as-fired PSZ ceramic.

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Authors and Affiliations

  1. Metals and Ceramics Division, Oak Ridge National Laboratory, 37831, Oak Ridge, Tennessee, USA

    Paul F. Becher

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  1. Paul F. Becher
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Becher, P.F. Subcritical crack growth in partially stabilized ZrO2(MgO). J Mater Sci 21, 297–300 (1986). https://doi.org/10.1007/BF01144735

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  • DOI: https://doi.org/10.1007/BF01144735

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