Preparation of ceria-gadolinia electrolytes by the tape rolling technique

Date

1998-03-01

Author

Özkan, Necati

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

87
views

0
downloads

The preparation of thin (ca. 200 mu m) Ce0.9Gd0.1O1.95 planar electrolytes using the tape rolling technique is described. The processing and formation of these electrolytes involved several steps: (i) the production of a processable ceramic paste, (ii) rolling and cutting, (iii) binder burnout, and (iv) sintering. The rheology of these ceramic pastes is characterized by a hardness indentation test. The materials parameters which may be obtained from the hardness indentation test such as the hardness (plastic flow stress), elastic modulus, and plasticity index are provided. The rheology, as characterized by the hardness method, of the pastes is shown to be influenced by the nature and extent of processing aids and also the mixing and milling times. Further, it is shown that by using a paste formulation with appropriate rheological properties. it is possible to produce uniform thin green tapes using a twin roll mill. The binder burnout characteristics of the ceramic pastes were studied by using a specially constructed thermal gravimetric apparatus. It is shown that the heating rate and the ambient atmosphere have strong influences upon the binder burnout kinetics of these green tapes. Finally, it is shown that sintered Ce0.9Gd0.1O1.9 electrolytes, with a near theoretical density and with a uniform microstructure as well as a chosen near net shape, may be prepared from the corresponding tape rolled greens.

Subject Keywords

Indentation, Contact, Area

URI

https://hdl.handle.net/11511/32010

Journal

JOURNAL OF MATERIALS RESEARCH

DOI

https://doi.org/10.1557/jmr.1998.0083

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Characterization of ceramic pastes by an indentation hardness test BRISCOE, BJ; Özkan, Necati (1997-01-01) Certain material deformation properties of a typical alumina based ceramic paste system, including the hardness (a plastic yield characteristic), the elastic modulus, a plasticity index (a measure of the relative elastic-plastic response), and a mean flow stress, are obtained using an indentation hardness test. In order to compute these material properties a contact compliance procedure, in conjunction with an analysis based upon an adaptation of the Box-Cox curve fitting method for the compliance curve, ha...
Synthesis of block conducting copolmers of cholesteryl functionalized thiophene and their use in the immobilization of cholesterol oxidase Çırpan, Ali; Toppare, Levent Kamil; Department of Chemistry (2004) Synthesis and characterization of conducting copolymers were achieved by using thiophene-3-yl acetic acid cholesteryl ester (CM) and poly (3-methylthienyl methacrylate) (PMTM). A new polythiophene containing a cholesteryl side chain in the b- position was chemically polymerized in nitromethane/carbon tetrachloride using FeCl3 as the oxidizing agent. Polymerization was also achieved by constant current electrolysis in dichloromethane. Subsequently, conducting copolymers of thiophene-3-yl acetic acid choleste...
Scattering of He from a Cu(110) surface Özder, Serhat; Erkoç, Şakir (Elsevier BV, 1987-4) Using the close-coupling method we have investigated the diffraction of He atoms from a Cu ( 110 ) surface. Interaction between He and the copper surface is represented by a corrugated Mie-type potential. The softness parameter β is “optimized” for a given incident energy (Ei) and incident angle (θi) so as to reproduce the experimental results. An empirical expression for the softness parameter β(Ei, θi) is obtained. Our results are in good agreement with previous calculations and experimental observations.
Synthesis and electrochromic properties of a multichromic, conducting, soluble polythiophene derivative and its copolymer Özyurt, Funda; Toppare, Levent Kamil; Department of Chemistry (2009) A new polythiophene derivative, poly-2,3-bis(4-tert-butylphenyl)-5,8-bis(4-hexylthiophen-2-yl)quinoxaline PHTQ was synthesized by both chemical and electrochemical polymerization and its electrochemical properties were reported. The monomer was electrochemically polymerized in the presence of tetrabutylammonium hexafluorophosphate(TBAPF6) as the supporting electrolyte in dichloromethane-acetonitrile (5:95, v:v). Nuclear magnetic resonance spectroscopy (1H-NMR, 13C-NMR) was utilized for the characterization ...
Characterization of conducting copolymers of succinic acid bis-(-4-pyrrol-1-yl-phenyl) ester and thiophene via pyrolysis mass spectrometry Ertas, Merve; Hacaloğlu, Jale; Toppare, Levent Kamil (2005-03-01) In this work, a direct pyrolysis mass spectrometry technique was applied to characterize a conducting copolymer of succinic acid bis-(4-pyrrol-1-yl-phenyl) ester (SM) and thiophene prepared by electrochemical polymerization. Thermal degradation behavior of both components was quite similar to those of the corresponding homopolymers, PSM, and polythiophene PTh. Yet, detection of oligomers and mixed dimers of both monomers in the high temperature pyrolysis mass spectra confirmed the formation of a copolymer. ...

Citation Formats

N. Özkan, “Preparation of ceria-gadolinia electrolytes by the tape rolling technique,” JOURNAL OF MATERIALS RESEARCH, pp. 665–674, 1998, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32010.