Development and performance of diopside based glass-ceramic sealants for solid oxide fuel cells

TY - JOUR

T1 - Development and performance of diopside based glass-ceramic sealants for solid oxide fuel cells

AU - Goel, Ashutosh

AU - Tulyaganov, Dilshat U.

AU - Pascual, Maria J.

AU - Shaaban, Essam R.

AU - Muñoz, Francisco

AU - Lü, Zhe

AU - Ferreira, José M.F.

PY - 2010/5/1

Y1 - 2010/5/1

N2 - We report on the development and performance of diopside (CaMgSi2O6) based glass-ceramic (GC) sealants for solid oxide fuel cells (SOFCs). Ten glass compositions were prepared by various additions and substitutions of La2O3, Cr2O3 and B2O3 in diopside system. The structure of the glasses has been investigated by employing 29Si, 27Al and 11B MAS-NMR spectroscopy. The crystallization kinetics of the glasses has been investigated using differential thermal analysis (DTA) while X-ray diffraction (XRD) in conjunction with Rietveld-RIR technique has been employed to quantify the amount of crystalline and amorphous phases in the GCs. Hot-stage microscopy (HSM) has been used to investigate the influence of La2O3 and B2O3 on the sintering behavior of the glass powders. The joining and chemical interaction of the B2O3 and La2O3-containing glasses with Crofer22 APU and Sanergy HT (metallic interconnects for SOFC), has been investigated in humidified reducing atmosphere at SOFC operating temperature while the leak rate of GC sealants has been investigated using oxygen pump leak rate method. The suitable sintering and crystallization behavior of the GCs along with good adhesion to interconnect alloys and low leak rate indicate that the investigated GCs are suitable candidates for further experimentation as SOFC sealants.

AB - We report on the development and performance of diopside (CaMgSi2O6) based glass-ceramic (GC) sealants for solid oxide fuel cells (SOFCs). Ten glass compositions were prepared by various additions and substitutions of La2O3, Cr2O3 and B2O3 in diopside system. The structure of the glasses has been investigated by employing 29Si, 27Al and 11B MAS-NMR spectroscopy. The crystallization kinetics of the glasses has been investigated using differential thermal analysis (DTA) while X-ray diffraction (XRD) in conjunction with Rietveld-RIR technique has been employed to quantify the amount of crystalline and amorphous phases in the GCs. Hot-stage microscopy (HSM) has been used to investigate the influence of La2O3 and B2O3 on the sintering behavior of the glass powders. The joining and chemical interaction of the B2O3 and La2O3-containing glasses with Crofer22 APU and Sanergy HT (metallic interconnects for SOFC), has been investigated in humidified reducing atmosphere at SOFC operating temperature while the leak rate of GC sealants has been investigated using oxygen pump leak rate method. The suitable sintering and crystallization behavior of the GCs along with good adhesion to interconnect alloys and low leak rate indicate that the investigated GCs are suitable candidates for further experimentation as SOFC sealants.

KW - Aluminosilicates

KW - Borosilicates

KW - Crystallization

KW - Glass ceramics

KW - NMR, MAS-NMR and NQR

KW - Scanning electron microscopy

KW - Sealant

KW - Sintering

KW - Solid oxide fuel cell

KW - X-ray diffraction

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U2 - 10.1016/j.jnoncrysol.2010.01.012

DO - 10.1016/j.jnoncrysol.2010.01.012

M3 - Article

SN - 0022-3093

VL - 356

SP - 1070

EP - 1080

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

IS - 20-22

ER -