REDUCING THERMAL CONDUCTIVITY OF THERMAL BARRIER COATING MATERIALS WITH DOPING
The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16


Presented at:
The 5th International Symposium on SuperCritical Water-cooled Reactors
2011 March 13-16
Location:
Vancouver,Canada
Session Title:
Materials IV (Coatings)

Authors:
Dongmei Wang (Nuclear Engineering Inc.)
Xiao Huang (Carleton University)
  

Abstract

Metal oxides of different valence, ionic radius and mass were incorporated into yttria partially stabilized zirconia (YSZ) in order to investigate the thermal conductivity changes as a result of co-doping. A Mechanical alloying process was used to produce powder blends which were subsequently sintered at 1500°C for 120 hours. The sintered samples were then subjected to detailed examination to determine their thermal conductivities. It was found that, in general, the trivalent oxides Yb2O3, Sc2O3 and Cr2O3, exhibited the most significant effect on reducing the thermal conductivity of 7YSZ (7 wt%Y2O3-ZrO2). This trend was followed by the pentavalent co-doping oxides of Nb2O5 and Ta2O5 whereas the tetravalent CeO2co-doped 7YSZ showed a lesser effect.

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