The role of a threshold stress in the superplastic deformation of fine-grained yttria-stabilized zirconia polycrystals

1996 ◽  
Vol 34 (7) ◽  
pp. 1155-1160 ◽  
Author(s):  
Alfonso Bravo-León ◽  
Manuel Jiménez-Melendo ◽  
Arturo Domínguez-Rodríguez ◽  
Atul H. Chokshi
Keyword(s):  
Superplastic Deformation ◽  
Threshold Stress ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Fine Grained

A Comparative Study of Superplastic Deformation and Cavitation Failure in a Yttria Stabilized Zirconia and a Zirconia Alumina Composite

1990 ◽  
Vol 196 ◽  
Author(s):  
A. H. Chokshi ◽  
D. J. Schissler ◽  
T.-G. Nieh ◽  
J. Wadsworth
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Superplastic Deformation ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Experimental Conditions ◽  
Fine Grained ◽  
Grain Sizes ◽  
Alumina Composite ◽  
Cavitation Failure

ABSTRACTA fine grained yttria stabilized zirconia and a zirconia composite containing 20% alumina exhibit superplastic characteristics, with optimum elongations to failure of ≥500%. There is microstructural evidence for deformation enhanced grain growth and concurrent cavitation in both of these superplastic ceramics. Grain sizes after superplastic deformation may be several times larger than the initial grain size, and the level of cavitation can attain values as high as ≥30% under some experimental conditions. This report presents in a comparative format some recent experimental results on the microstructural aspects of superplastic deformation and concurrent cavitation in these superplastic ceramics.

Grain-Size-Dependent Thermal Transport Properties in Nanocrystalline Yttria-Stabilized Zirconia

2001 ◽  
Vol 703 ◽  
Author(s):  
Ho-Soon Yang ◽  
J.A. Eastman ◽  
L.J. Thompson ◽  
G.-R. Bai
Keyword(s):  
Grain Boundaries ◽  
Thermal Transport ◽  
Chemical Vapor ◽  
Yttria Stabilized Zirconia ◽  
Organic Chemical ◽  
Stabilized Zirconia ◽  
Size Dependent ◽  
Metal Organic ◽  
Organic Chemical Vapor Deposition

ABSTRACTUnderstanding the role of grain boundaries in controlling heat flow is critical to the success of many envisioned applications of nanocrystalline materials. This study focuses on the effect of grain boundaries on thermal transport behavior in nanocrystalline yttria-stabilized zirconia (YSZ) coatings prepared by metal-organic chemical vapor deposition.

Role of the First Atomic Layers in Epitaxial Relationship and Interface Characteristics of SrTiO3 Films on CeO2/YSZ/Si(001)

2002 ◽  
Vol 747 ◽  
Author(s):  
Tomoaki Yamada ◽  
Takanori Kiguchi ◽  
Naoki Wakiya ◽  
Kazuo Shinozaki ◽  
Nobuyasu Mizutani
Keyword(s):  
Atomic Layer ◽  
Yttria Stabilized Zirconia ◽  
The Other ◽  
Stabilized Zirconia ◽  
Epitaxial Relationship ◽  
Electron Traps ◽  
Ion Drift ◽  
Interface Characteristics ◽  
Injection Type

ABSTRACTThe role of the first atomic layers in epitaxial relationship and interface characteristics of SrTiO3 films on CeO2/yttria-stabilized zirconia (YSZ)/Si(001) substrates was investigated. Although SrTiO3 film deposited on CeO2/YSZ/Si directly was preferentially (110)-oriented, epitaxial SrTiO3(001) films could be grown on CeO2/YSZ/Si by controlling first atomic layer of the films. In the case of SrTiO3 film starting from TiO2 layer, the neither ion drift nor charge injection occurred in the SrTiO3/CeO2 interface. On the other hand, for the film starting from SrO layer, an injection-type hysteresis was observed. This is probably due to the electron traps in the interface.

Role of grain boundaries on the electrical properties of titania doped yttria stabilized zirconia

1995 ◽  
Vol 30 (4) ◽  
pp. 515-522 ◽  
Author(s):  
M.T. Colomer ◽  
L.S.M. Traqueia ◽  
J.R. Jurado ◽  
F.M.B. Marques
Keyword(s):  
Electrical Properties ◽  
Grain Boundaries ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia

Investigation of Failure Mechanisms in Ti Containing Brazing Alloys Used in SOFC/SOEC Environments

2010 ◽  
Author(s):  
Wolff-Ragnar Kiebach ◽  
Ruth Knibbe ◽  
Kristian B. Frederiksen ◽  
Ming Chen ◽  
Lars Mikkelsen ◽  
...  
Keyword(s):  
Ferritic Steel ◽  
Failure Mechanisms ◽  
Annealing Process ◽  
Yttria Stabilized Zirconia ◽  
Reaction Products ◽  
Stabilized Zirconia ◽  
Advantages And Disadvantages ◽  
Active Metal ◽  
Reported Data

The two braze alloys TiCuNi® and Silver-ABA® were tested as possible candidates for seals in SOFC or SOEC stacks. The different Ti amount in the samples allowed an evaluation of Ti as a matrix filler and as an active metal/wetting agent in brazing alloys. The sealing ability towards ferritic steel and yttria-stabilized-zirconia (YSZ) was investigated. After the sealing process steel/braze/YSZ joints were further annealed in oxidizing (Air) or reducing (9% H2 in Ar) atmospheres at 750 °C for 150 h. The boundaries of the braze and the joining partners for as-sealed and annealed samples were examined with SEM/EDS. XRD and EXAFS were used to characterize reaction products after the annealing process. Based on these results and taking before reported data into consideration, the advantages and disadvantages of Ti containing seals and the role of Ti in failure mechanism are discussed. Even if the use of Ti in active brazing alloys has its benefits, the disadvantages caused by Ti and its reaction products strongly suggest the use of Ti free brazes in SOFC/SOEC applications.

scholarly journals Role of dispersion conditions on grindability of yttria stabilized zirconia (YSZ) powders

2005 ◽  
Vol 28 (2) ◽  
pp. 109-114 ◽  
Author(s):  
S. Ramanathan ◽  
K. P. Krishna Kumar ◽  
P. K. De ◽  
S. Banerjee
Keyword(s):  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia
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