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Efficacy of HfN as sintering aid in the manufacture of ultrahigh-temperature metal diborides-matrix ceramics

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Abstract

HfB2 and (ZrB2 + HfB2)-based ceramics containing 19.5 vol% SiC particulate were developed from commercially available powders by hot-pressing. With the assistance of 3 vol% HfN as sintering aid, after hot-pressing at 1900 °C and 50 MPa of applied pressure, full density in both the composites was successfully achieved. The materials revealed a homogeneous microstructure, characterized by faceted diboride grains (2 μm average size) and SiC particles regularly dispersed. Limited levels of secondary phases were found. The thermomechanical properties of the composites were promising: about 22 GPa microhardness and 500 GPa Young’s modulus for both. The HfB2-SiC composite showed values of strength of 650 ± 50 and 465 ± 40 MPa at 25 and 1500 °C, respectively. Likewise, the (ZrB2-HfB2)-SiC composite exhibited values of strength of 765 ± 20 and 250 ± 45 MPa at 25 and 1500 °C, respectively. The excellent response at high temperature in air was attributed to the refractoriness of the phases constituting the composites and to the resistance to oxidation enhanced by the presence of the SiC particulate.

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  1. National Research Council—Institute of Science and Technology for Ceramics, 48018, Faenza, Italy

    Frédéric Monteverde & Alida Bellosi

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  1. Frédéric Monteverde
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  2. Alida Bellosi
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Correspondence to Frédéric Monteverde.

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Monteverde, F., Bellosi, A. Efficacy of HfN as sintering aid in the manufacture of ultrahigh-temperature metal diborides-matrix ceramics. Journal of Materials Research 19, 3576–3585 (2004). https://doi.org/10.1557/JMR.2004.0460

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  • DOI: https://doi.org/10.1557/JMR.2004.0460

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