ZrB2 was mixed with 0.5 wt% carbon and up to 10 vol% ZrC and densified by hot-pressing at 2000 °C. All compositions were > 99.8% dense following hot-pressing. The dense ceramics contained 1–1.5 vol% less ZrC than the nominal ZrC addition and had between 0.5 and 1 vol% residual carbon. Grain sizes for the ZrB2 phase decreased from 10.1 µm for 2.5 vol% ZrC to 4.2 µm for 10 vol% ZrC, while the ZrC cluster size increased from 1.3 µm to 2.2 µm over the same composition range. Elastic modulus was ~505 GPa and toughness was ~2.6 MPa·m½ for all compositions. Vickers hardness increased from 14.1 to 15.3 GPa as ZrC increased from 2.5 to 10 vol%. Flexure strength increased from 395 MPa for 2.5 vol% ZrC to 615 MPa for 10 vol% ZrC. Griffith-type analysis suggests ZrB2 grain pullout from machining as the strength limiting flaw for all compositions.
E. W. Neuman et al., "Processing and Mechanical Properties of Hot-Pressed Zirconium Diboride – Zirconium Carbide Ceramics," Journal of the European Ceramic Society, vol. 42, no. 11, pp. 4472 - 4478, Elsevier, Sep 2022.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2022.04.053
Materials Science and Engineering
Keywords and Phrases
Hot-pressing; Mechanical properties; Zirconium carbide; Zirconium diboride
International Standard Serial Number (ISSN)
Article - Journal
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01 Sep 2022