Calcium-borosilicate glass-ceramic as a sealant for SOFC

Authors:
Publisher website
Google Scholar
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.

This publication has 20 references indexed in Scilit: