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Thermal Shock Induced Phases Transformation and Microstructural Changes in a Novel Hydrogen Transport Membrane

Published online by Cambridge University Press:  15 July 2015

Lily, Yongjun Zhang ,
Sukumar Bandopadhyay ,
U. (Balu) Balachandran  and
Nagendra Nag
Lily, Yongjun Zhang
Affiliation:
College of Engineering and Mines, University of Alaska Fairbanks, AK 99775, U.S.A
Sukumar Bandopadhyay
Affiliation:
College of Engineering and Mines, University of Alaska Fairbanks, AK 99775, U.S.A
U. (Balu) Balachandran
Affiliation:
Energy Systems Division, Argonne National Laboratory, Chicago, IL 60439, U.S.A
Nagendra Nag
Affiliation:
Group Manager, Advanced Process Development, Surmet Corporation, Buffalo, NY 14207, U.S.A
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Abstract

Bulk samples of a novel cermet (ceramic/metal composite) hydrogen transport membrane (HTM) were subjected to thermal cycling in the temperature range between 25-850°C to study phase transformations and microstructural changes under thermal shock. Scanning electron microscopy (SEM) and electron probe micro analyzer (EPMA) with energy dispersive spectroscopy (EDS) were used to characterize the microstructural and chemical changes in the membrane upon thermal cycling. SEM & EPMA analyses indicated that the temperature gradient during thermal cycling produced more micro-cracks inside the HTM disc, whereas, the chemical reaction between Pd and oxygen to form PdO disturbed the continuity of the metal palladium (Pd) - Yttria Stabilized Zirconia (YSZ) dual phases interconnection system from surface down. The agglomerates of un-crystallized YSZ grains found to be the inherent in the cracks of the as-received HTM. A combination of trans-granular and inter-granular crack propagation results around the YSZ grains and the new precipitates. Based on the electron fractography analyses by both SEM and EPMA, the micro voids coalescence develops ahead of the crack tips in the cross-section of the HTM after 500 thermal cycles.

Keywords

ceramicphase transformationmicrostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1810: Symposium YY – Insights for Energy Materials Using In-Situ Characterization , 2015 , mrss15-2137426
Copyright
Copyright © Materials Research Society 2015 

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References

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