Calcium-borosilicate glass-ceramic as a sealant for SOFC

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Abstract

The paper reports study of the applicability of calcium-borosilicate glass-ceramics with high boron oxide content as a sealant for solid oxide fuel cells. Chemical composition of the studied materials was 33 mol% CaO, 21 mol% B2O3, 46 mol% SiO2. The material was studied as an alternative to existing sealants on the base of calcium and barium aluminosilicates, because of the limited adhesion of the latter to steel interconnects in fuel cells. The study has shown that the studied sealant has a softening point of about 920–930°C, which allows one to use for sealing of fuel cells at 925°C. Use of relatively low sealing temperature allows one to avoid overheating of the cell during sealing and to avoid accompanying degradation of the service properties. The studied sealant has demonstrated excellent adhesion to surface of interconnect materials (Crofer 22 APU steel). Furthermore, the studied sealant was found to be thermomechanically compatible with Crofer 22 APU steel and ZrO2-based electrolytes.

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A. O. Zhigachev

ISSP RAS

Author for correspondence.
Email: zhigachev@issp.ac.ru
Russian Federation, Chernogolovka

S. I. Bredikhin

ISSP RAS

Email: zhigachev@issp.ac.ru
Russian Federation, Chernogolovka

E. A. Agarkova

ISSP RAS

Email: stepanova.ea@issp.ac.ru
Russian Federation, Chernogolovka

D. V. Matveev

ISSP RAS

Email: zhigachev@issp.ac.ru
Russian Federation, Chernogolovka

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Supplementary files

Supplementary Files
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2. Fig. 1. X-ray diffraction pattern obtained on a CaO–SiO2–B2O3 sealant quenched from the melt.

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3. Fig. 2. X-ray diffraction patterns of the sealant after heat treatment at 950°C.

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4. Fig. 3. Dilatometric curve of the sealant we studied after exposure to 950°C for 1 hour.

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5. Fig. 4. SEM images of the steel-sealant assembly after treatment at 950°C for one hour. Sealant composition: 33 mol.% CaO, 21 mol.% B2O3, 46 mol.% SiO2 (a, b), commercial sealant Schott 394 (c).

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6. Fig. 5. SEM image of the area where EDX measurements were carried out.

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7. Fig. 6. SEM image of the sealant–ZrO2-based electrolyte interface after bonding at 950°C.

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Note

Публикуется по материалам IX Всероссийской конференции с международным участием “Топливные элементы и энергоустановки на их основе”, Черноголовка, 2022.


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