Mechanical Properties of Zirconium-Diboride Based UHTCs
This chapter discusses the current state-of-the-art in mechanical properties of zirconium diboride based Ultra-High temperature ceramics. The properties covered include the elastic modulus, strength, and fracture toughness at both ambient and elevated temperatures. The discussion concentrates on monolithic zirconium diboride, and zirconium diboride with additions of silicon carbide and/or transition metal disilicides as a second phase. The effect of microstructure and impurities on the mechanical properties will be discussed. An example is the finding that the morphology of the second phase, and its distribution, controls the mechanical properties of in ZrB2-based ceramics. The chapter will also discuss the improvements in mechanical properties that have been obtained using modern powders and processing techniques compared to historic studies from the 1960s. For example, an improvement in the strength of monolithic ZrB2 at 2200⁰C has recently been realized, from 50MPa for the historic material to 200MPa for the modern material. The chapter concludes with suggestions for improving the mechanical properties of diborides and recommendations for future studies.
E. W. Neuman and G. Hilmas, "Mechanical Properties of Zirconium-Diboride Based UHTCs," Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications, pp. 167-196, Wiley Blackwell, Nov 2014.
The definitive version is available at https://doi.org/10.1002/9781118700853.ch8
Materials Science and Engineering
Keywords and Phrases
Elastic modulus; Hardness; Molybdenum disilicide; Silicon carbide; Strength; Toughness; Ultra-High temperature ceramics; Zirconium diboride
International Standard Book Number (ISBN)
Book - Chapter
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01 Nov 2014