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Boron Rich Solids pp 147–160Cite as

Processing and Properties of Ultra-Refractory Composites Based on Zr- and Hf-Borides: State of the Art and Perspectives

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Abstract

High performance Ultra-High-Temperature Composites, based on zirconium and hafnium borides, are characterized by relevant and unique thermo-physical and thermo-mechanical properties, suitable for applications in aerospace hot structures and in many industrial sectors where extreme conditions are present.

In spite of the difficult sinterability of Zr- and Hf-diborides, recent results highlight that these ceramics can be produced with full density, fine microstructure and controlled mechanical and thermal properties, through different procedures: pressureless sintering and hot pressing with proper sintering aids, reactive synthesis/sintering procedures starting from precursors, field assisted technologies like spark plasma sintering (SPS).

A proper selection of reinforcing phase (SiC, B4C, TaSi2, MoSi2, etc) leads to improvements in mechanical properties and oxidation resistance of ZrB2 and HfB2 ceramic composites.

Strength as high as ~800 MPa at room temperature and at 1,500°C in air can be obtained for HfB2-based composites, after an accurate tailoring of compositions and processing parameters. SPS proved to be a very rapid fabrication process leading to refined microstructure and improved properties of ultra-refractory diborides-based composites.

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  1. CNR-ISTEC, Institute of Science and Technology, 48018, Faenza, Italy

    A. Bellosi, S. Guicciardi, V. Medri, F. Monteverde, D. Sciti & L. Silvestroni

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  1. A. Bellosi
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Correspondence to A. Bellosi .

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  1. Dept. Mechanical, Materials &, Aerospace Engineering, University of Central Florida, Central Florida Blvd. 4000, Orlando, 32816, Florida, USA

    Nina Orlovskaya

  2. Inst. for Problems of Materials Science, Krzhizhanivskii Street 3, Kyiv, 03142, Ukraine

    Mykola Lugovy

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Bellosi, A., Guicciardi, S., Medri, V., Monteverde, F., Sciti, D., Silvestroni, L. (2010). Processing and Properties of Ultra-Refractory Composites Based on Zr- and Hf-Borides: State of the Art and Perspectives. In: Orlovskaya, N., Lugovy, M. (eds) Boron Rich Solids. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9818-4_10

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