Two-Stage Master Sintering Curve Approach to Sintering Kinetics of Undoped and Al2O3-Doped 8 Mol% Yttria-Stabilized Cubic Zirconia

Abstract

Eight mol% of YSZ is considered as one of the most promising electrolyte materials for solid oxide fuel cell. Small amount of Al2O3 is often added to 8YSZ to enhance its mechanical properties and conductivity, as well as to improve its sintering behavior. In this study, the activation energy and sintering kinetics of both undoped and 0.2–2.0 wt% Al2O3‐doped 8YSZ are determined with the help of master sintering curve (MSC). It was found that a better representation of the sintering behavior could be achieved by constructing MSC over two consecutive densification stages with the relative density of 60% set as the boundary. From the activation energy values of the two stages obtained, two densification mechanisms were identified for the undoped and Al‐doped samples. Based on literature data, the possible mechanisms that dominate the two stages were proposed and discussed.

Particle atomic layer deposition of alumina for sintering yttria‐stabilized cubic zirconia

“…The slopes were then averaged over this density range to obtain a Q for each sample type (Figure ). Q for 0ALD was found to be 665 ± 48 kJ/mol, compared with 580 and 615 ± 80 kJ/mol determined by Song et al and Wang and Raj, respectively. Adding Al 2 O 3 decreased the intermediate stage of densification temperatures and lowered Q until it reached a minimum value of 414 ± 74 kJ/mol for 5ALD.…”

Densification and grain growth behavior study of trivalent MO1.5 (M=Gd, Bi) doped ceria systems

“…The maximum shrinkage rate increases as the heating rate increases. It can be ascribed to a prolonged time scale for mass transport and diffusion when a slower heating rate is used to reach the same temperature [18]. Fig.…”

Co-sintering anode and Y2O3 stabilized ZrO2 thin electrolyte film for solid oxide fuel cell fabricated by co-tape casting

“…For the anode, it was 22.35% with its fastest rate of 4.7 Â 10 À4 h À1 at 0.5 C$min À1 , while it was 20.01% with its fastest rate of 2.3 Â 10 À3 h À1 at 3 C$min À1 . These were ascribed to a prolonged time scale for mass transport and diffusion when a slower heating rate was used to reach the same temperature [34]. The shrinking rate mismatches between the electrolyte and the anode presented in Fig.…”