Rare earth added barium alumino borosilicate glass-ceramics as sealants in solid oxide fuel cells

Glasses with composition 50BaO-(5-x) Al2O3-xR2O3-30B2O3-15SiO2 (x = 0,5 and R = Nd, Gd, La, Dy) have been synthesized by conventional melt quenching method. Controlled crystallization has been carried out to convert these glasses to corresponding glass-ceramics. X-ray diffraction (XRD) technique has been used to identify the crystalline phases formed in glass-ceramics. Archimede's method has been used to measure the density of glassceramics. The co-efficient of thermal expansion of all glass-ceramics lie within the range (11.60 - 12.81) x 10-6/ degrees C, which matches with that of the other components of solid oxide fuel cell. The interaction study of glassceramics with Crofer22APU interface and Crofer22APU/Glass-ceramic/Crofer22APU showed no evidence of interfacial failure and cracks. Hence the prepared glass-ceramics can be considered as a suitable candidate for sealant materials in SOFC applications.

Automated summary

Glass-ceramics suitable for sealant materials in solid oxide fuel cell applications were synthesized using conventional melt quenching method, showing ideal thermal expansion coefficient and good interaction with metal interfaces. Study of interaction with metal interfaces revealed no evidence of failure or cracks.