Thermal properties of zirconium diboride ceramics
September 17-20, 2017
This presentation will focus on the thermal conductivity of zirconium diboride ceramics. Previous reports of thermal conductivity values for ZrB2 vary from as low as about 30 W/m•K to over 100 W/m•K without any direct evidence to identify the reasons for the variations. Our group systematically investigated the effects of transition metal impurities, which led to the discovery that the size of the dissolved impurity species was directly related to the decrease in thermal conductivity. Analysis of the electron contribution to thermal conductivity utilizing the Wiedemann-Franz methodology led to the conclusion that both the phonon and electron contributions were affected by dissolved metallic impurities. Further, the effects of some transition metals including Ti and Y were masked by other impurities in ceramics produced from commercial ZrB2 powders.
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William G. Fahrenholtz and Gregory E. Hilmas, "Thermal 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). http://dc.engconfintl.org/uhtc_iv/23