ECI Digital Archives

Title

Mechanical properties of zirconium diboride ceramics

Authors

Gregory E. Hilmas, Missouri University of Science and TechnologyFollow
William G. Fahrenholtz, Missouri University of Science and Technology

Conference Dates

September 17-20, 2017

Abstract

This presentation will focus on the mechanical properties of zirconium diboride ceramics. Diboride ceramics offer a combination of properties that include high elastic modulus, hardness, strength, and moderate fracture toughness to elevated temperatures. However, like all structural ceramics, their mechanical properties are controlled by microstructure wherein grain size, dispersion and size of second phases, and impurities limit their potential use at elevated temperatures, particularly for proposed extreme environment applications at temperatures exceeding 2000°C. As an example, the flexure strength of nearly phase pure ZrB₂ ranges from 300 to >600 MPa at room temperature but retains a strength of >300 MPa at temperatures >1500°C. Further, the fracture toughness of ZrB₂ ceramics is generally low, typically in the range of 3 to 4 MPa-m^1/2, at both room and elevated temperatures.

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Recommended Citation

Gregory E. Hilmas and William G. Fahrenholtz, "Mechanical properties of zirconium diboride ceramics" in "Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications IV", Jon Binner, The University of Birmingham, Edgbaston, United Kingdom Bill Lee, Imperial College, London, United Kingdom Eds, ECI Symposium Series, (2017). https://dc.engconfintl.org/uhtc_iv/24