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Comparative Estimation of Fracture Resistance Test Methods: Zirconia Ceramics

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Strength of Materials Aims and scope

The fracture of zirconia ceramics both at macro (specimen bending with a stress raiser in the tensile region) and micro (Rockwell indentation with specimen edge chipping) levels was studied. Experimental data, plotted on the classification diagram of brittle materials at their micro and macrofracture (FR - KIc relation), did not fall on the baseline constructed by chipping results of simple single-phase ceramics, demonstrating a significant difference in the properties of zirconia ceramics (Y-TZP, Mg-PSZ, and composite ZrO2/Al2O3 as compared to those of single-phase materials, which must not be overlooked in such an important application as dentistry. Therefore, the behavior of those ceramics on microfracture was studied with the Edge Chipping EF method. It involves the chipping of a polished rectangular prismatic specimen with an indenter impressed near its sharp edge. The edge chipping of tested specimens was effected with a Rockwell indenter as the basic instrument, and the additional ones were a standard Vickers indenter and a diamond cone with a tip radius of 400 μm. Analysis of the test results also included fracture toughness data on examined ceramics obtained with the SEVNB method, which involves bending of a prismatic specimen with a transverse through sharp V-notch in the tensile region.

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  1. Pisarenko Institute of Problems of Strength, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    G. A. Gogotsi

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Correspondence to G. A. Gogotsi.

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Translated from Problemy Mitsnosti, No. 5, pp. 96 – 107, September – October, 2022.

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Gogotsi, G.A. Comparative Estimation of Fracture Resistance Test Methods: Zirconia Ceramics. Strength Mater 54, 841–849 (2022). https://doi.org/10.1007/s11223-022-00460-w

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