Investigation on leakage and chemical interaction of BaO–SiO2–B2O3 based glass-ceramic sealants and AISI430 interconnect

Subject Areas :

laila Rezazadeh ^{1 *}

1 - 1- Assistant Professor, Department of Mechanic, Marand Branch, Islamic Azad University, Marand, Iran

Received: 2016-02-05 Accepted : 2017-09-12 Published : 2017-08-23

Keywords: SOFC, glass-ceramic sealant, chemical interaction, leak rate,

Abstract :

In the present work, adhesion, leak rate and chemical compatibility of a series of borosilicate-based glasses, belong to ternary BaO–SiO2–B2O3 system, with AISI 430 alloys as interconnect were investigated for solid oxide fuel cell applications. Deformation behaviors of selected glasses at sealing temprature with time were characterized. Significant deformation was not appeared in the samples overtime at sealing temperature. In the next step, the leakage tests of AISI430/glass-ceramics couples were performed. Glass containing 32 % molar BaO (Ba32) had no gas leakage; a low leak rate of 10-7 to 10-8 Pam3s-1 was obtained for the glass with 37 % molar BaO (Ba37) and big leak of the system (10-3 to 10-4 Pam3s-1) for Ba42. Possible interfacial reactions between the as-received glass and cell ingredients and aging up to 100 h were also studied by scanning electron microscopy in conjunction with energy-dispersive X-ray spectroscopy and X-ray dot mapping. The results showed the Ba32 and Ba37 glasses coupled with AISI430 had fine adhesion, remained stable under these conditions and were compatible with the interconnect. So, the use of these glass-ceramics will be successful in joining the ceramic electrolytes to the metallic interconnect.

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