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Accelerated devitrification of a strontiumlanthanumaluminoborosilicate based intermediate temperature solid oxide fuel cell glass sealant and its effect on thermophysical behaviour of the glass ceramics

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Title Accelerated devitrification of a strontiumlanthanumaluminoborosilicate based intermediate temperature solid oxide fuel cell glass sealant and its effect on thermophysical behaviour of the glass ceramics
 
Creator OJHA, PK
CHONGDAR, TK
GOKHALE, NM
KULKARNI, AR
 
Subject Glass sealant
Devitrification
Thermochemical stability
Intermediate temperature solid oxide fuel cell (IT-SOFC)
THERMAL-STRESS ANALYSIS
TO-METAL SEALS
TECHNOLOGIES
STABILITY
STACKS
ALLOYS
SOFC
 
Description A strontiumlanthanumaluminoborosilicate based intermediate temperature solid oxide fuel cell (IT-SOFC) glass sealant has been investigated for isothermal devitrification under accelerated conditions. Sintering of the glass up to 100 h at 1000 degrees C, results in the formation of two crystalline phases evidenced by X-ray diffraction (XRD) analysis. Hexacelsian phase evolves from the initial hours of sintering: however, lanthanum silicate phase appears at longer hours of sintering. Quantitative XRD of the glass ceramics reveals that hexacelsian occupies majority of the crystalline phases and lanthanum silicate is occupying minor quantity. Formation of crystalline phases has been reconfirmed by microstructure analysis of glass ceramics through Scanning Electron Microscopy (SEM) and elemental analysis of phases by energy dispersive spectroscopy (SEM-EDS). Crystalline phases in the glass ceramics have been quantified by analysis of SEM images through Imagepro plus software. At different stages of sintering, CTE of the glass ceramics has been measured by dilatometer. Correlation of CTE with crystalline phases in the glass ceramics indicates that with formation of hexacelsian phase CTE of the glass ceramics increases, however, formation of lanthanum silicate phase reduces the CTE of the glass ceramics. Phase property correlation indicates that after 100 h of accelerated devitrification at 1000 degrees C, the glass ceramics attains phase stability therefore the CTE stabilizes and the value remains well within the requirement limit of SOFC sealant. (C) 2012 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2014-10-15T14:01:13Z
2014-10-15T14:01:13Z
2013
 
Type Article
 
Identifier JOURNAL OF POWER SOURCES, 22128-34
http://dx.doi.org/10.1016/j.jpowsour.2012.07.110
http://dspace.library.iitb.ac.in/jspui/handle/100/15050
 
Language en