Thermal Conductivity of Superplastically Deformed 3Y-TZP

Abstract

The thermal diffusivity and specific heat of superplastically deformed 3Y-TZP specimens were measured in a temperature range from 298 to 1273 K. From these data, the thermal conductivity has been evaluated and discussed. A weak temperature dependence of the thermal conductivity was observed. The thermal conductivity showed almost no dependence on the grain size and grain aspect ratio of the 3Y-TZP specimens. On the other hand, the thermal conductivity was considerably sensitive to the deformation-induced cavities. The influence of the cavities on the thermal conductivity is related with temperature. An expression was proposed for predicting the relationship between the effective thermal conductivity and deformation-induced cavities within the present experimental range.

Particle Surface Softening as Universal Behaviour during Flash Sintering of Oxide Nano-Powders

“…Using the measured (not calculated) published data for 3YSZ [19,20] and SrTiO 3 [8], where flash event durations were clearly indicated, their properties [22,23,24,25,26] and flash sintering conditions, together with their corresponding calculated temperature, T cont , are listed in Table 1. In both oxides, the temperatures at the particle contacts are far above their corresponding melting points, i.e., 3114 °C versus 2680 °C for 3YSZ, and 4216 °C versus 2080 °C for SrTiO 3 , and confirm the possibility for local melting/surface softening at these loci.…”

Theoretical Investigations on the Structural, Electronic, Mechanical, and Thermal Properties of MP2O7 (M = Ti,Hf)

“…The minimum thermal conductivity was predicted to be 1.52 and 0.99 W·m −1 ·K −1 for TiP 2 O 7 and HfP 2 O 7 , respectively. Compare with yttria‐stabilized zirconia (YSZ), the most successful and commercialized thermal barrier material, the minimum thermal conductivity of MP 2 O 7 is substantially low (the thermal conductivity is 2.6 ~ 2.8 W·m −1 ·K −1 for 3YSZ, 2.2 ~ 2.9 W·m −1 ·K −1 for 7YSZ). To uncover the origin of low thermal conductivity, we can refer to the Eq.…”

Athermal electric field effects in flash sintered zirconia

“…Radiation heat transfer from surface to the furnace (at 900 °C) was accounted for as in Ref. [45]. The electrical conductivity of zirconia sample was calculated by matching the sample resistance recorded during flash sintering after 22 s. The electrical conductivity was assumed constant as the temperature was fairly homogenous (within ± 50 ˚C) during the dwelling.…”