The grain size and temperature dependence of the thermal conductivity of polycrystalline, tetragonal yttria-stabilized zirconia

2011 ◽  
Vol 98 (21) ◽  
pp. 211906 ◽  
Author(s):  
Andi M. Limarga ◽  
David R. Clarke
Keyword(s):  
Thermal Conductivity ◽  
Grain Size ◽  
Temperature Dependence ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia

Elaboration of Sol-Gel Derived Hydroxyapatite / Yttria Stabilized Zirconia Composite Coatings Obtained for Biomedical Application

2011 ◽  
Vol 312-315 ◽  
pp. 894-899
Author(s):  
Sahar Salehi ◽  
Mohammad Hosseien Fathi
Keyword(s):  
Grain Size ◽  
Crystallite Size ◽  
Grain Growth ◽  
Biomedical Application ◽  
Composite Coatings ◽  
Sol Gel ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Nanostructured Composite

In this study, nanostructured composite coatings of hydroxyapatite (HA)/ 30wt% yttria stabilized zirconia (YSZ) coatings containing 0, 3, 5, and 8 mol% Y2O3 (namely; HA-0YSZ, HA-3YSZ, HA-5YSZ, and HA-8YSZ) were successfully synthesized using the sol-gel method. The crystallite size of the coating was about ~44-58 nm for tetragonal and cubic zirconia grain size and 75-87 nm for hydroxyapatite grain size. Crack-free and homogeneous HA-YSZ composite coatings were obtained with no observable defects. The uniform distribution of zirconia particles in a composite would be highly beneficial for obtaining homogeneous coatings of HA-YSZ film and would hinder grain growth of HA phase during calcinations. In vitro evaluation in 0.9% NaCl showed that Ca2+ dissolution rate of composite coatings was lower than pure HA coatings.

Applying the general effective media (GEM) approach for analyzing the thermal conductivity of ZrO2–8YSZ composites

2018 ◽  
Vol 20 (24) ◽  
pp. 16666-16672 ◽  
Author(s):  
Gal Shekel ◽  
Chen Barad ◽  
Hagay Hayun ◽  
Yatir Sadia ◽  
Yaniv Gelbstein
Keyword(s):  
Thermal Conductivity ◽  
Fuel Cells ◽  
Gas Turbine ◽  
Yttria Stabilized Zirconia ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Stabilized Zirconia ◽  
Effective Media

Zirconia (ZrO2) and yttria-stabilized-zirconia (YSZ) are known as advanced oxides, widely applied in gas-turbine engines, fuel cells and other applications, requiring controlled thermal conductivity values.

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