resumo
This article reports on the influence of strontium for calcium substitution in diopside-Ba disilicate glass-ceramics on stabilization thermal parameters and improvement adhesion to interconnect material of SOFCs. Sr replaced 10, 20, 30 and 40% of Ca in the Ca0.9MgAl0.1La0.1Si1.9O6 component of the parent glass having the following composition, mol.%: 22.14 CaO, 24.60 MgO, 0.52 BaO, 1.23 Al2O3, 1.23 La2O3, 47.79 SiO2, 1.69 B2O3, 0.79 NiO. Si-29-MAS-NMR and Al-27 MAS-NMR spectra of the glasses revealed irrelevant chemical shifts for silicon and aluminum atoms upon changing the SrO content. T-g decreased and coefficient of thermal expansion (CTE) increased by Sr for Ca substitution in pyroxene glasses. Additionally SrO-containing glasses exhibited a viscosity of similar to 10(6) dPa s at 900 degrees C, which is suitable for joining of SOFC metallic/ceramic components by glass/glass-ceramic sealing upon stack hermetization. Glass-ceramics revealed long term (up to 1000 h) thermal stability at 900 degrees C and suitable CTE values (10.0-11.3) x 10(-6) K-1, high electrical resistivity, good adhesion and minimal reactivity with SOFC components. Copyright (c) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
palavras-chave
OXIDE FUEL-CELLS; STRONTIUM SUBSTITUTION; SEALING GLASS; CRYSTALLIZATION; BEHAVIOR; VISCOSITY; KINETICS; ALLOY; JOIN; 45S5
categoria
Chemistry; Electrochemistry; Energy & Fuels
autores
Reddy, AA; Tulyaganov, DU; Pascual, MJ; Kharton, VV; Tsipis, EV; Kolotygin, VA; Ferreira, JMF
nossos autores
Allu Amarnath Reddy
Estudante de doutoramento
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)
Vladislav Kharton
Investigador Principal CovidadoProjectos
agradecimentos
This study was financially supported by the University of Aveiro, CICECO, and FCT, Portugal (PTDC/CTM-CER/114209/2009 and PEst-C/CTM/LA0011/2011).