Thermophysical Properties of ZrB 2 and ZrB 2 –SiC Ceramics
Термофизические свойства керамик ZrB2 и ZrB2–SiC
2008-02-16
SCID: 54.1/963qtabh
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ZrB2ZrB2–SiC ceramicselectrical resistivityelectron and phonon contributionsgrain size modelsheat capacitythermal conductivitythermal diffusivity
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Abstract (AI)
Thermophysical properties were investigated for zirconium diboride (ZrB 2 ) and ZrB 2 –30 vol% silicon carbide (SiC) ceramics. Thermal conductivities were calculated from measured thermal diffusivities, heat capacities, and densities. The thermal conductivity of ZrB 2 increased from 56 W (m K) −1 at room temperature to 67 W (m K) −1 at 1675 K, whereas the thermal conductivity of ZrB 2 –SiC decreased from 62 to 56 W (m K) −1 over the same temperature range. Electron and phonon contributions to thermal conductivity were determined using electrical resistivity measurements and were used, along with grain size models, to explain the observed trends. The results are compared with previously reported thermal conductivities for ZrB 2 and ZrB 2 –SiC.
Key Findings
1
Electron and phonon contributions to thermal conductivity were determined using electrical resistivity measurements.
2
Grain size models, together with electron/phonon partitioning, were used to explain the observed temperature-dependent trends.
3
Measured thermal conductivity of ZrB2–30 vol% SiC decreases from 62 W·m−1·K−1 at room temperature to 56 W·m−1·K−1 at 1675 K.
4
Measured thermal conductivity of pure ZrB2 rises from 56 W·m−1·K−1 at room temperature to 67 W·m−1·K−1 at 1675 K.
5
Results were compared with previously reported thermal conductivities for ZrB2 and ZrB2–SiC.
6
Thermal conductivities were calculated from measured thermal diffusivities, heat capacities, and densities.
Research Object
Zirconium diboride (ZrB2) and ZrB2–30 vol% silicon carbide (SiC) ceramics
Research Subject
Thermophysical properties, specifically thermal conductivity (and its electron and phonon contributions) as a function of temperature, derived from thermal diffusivity, heat capacity, density, electrical resistivity, and grain-size effects
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2008-02-16
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