Patent ID: 6656625
Filing Date: 2003-12-02
Classification: B32B,C04B,H01M,Y02E,Y10T

Abstract:
A high-performance seal between confronting faces of adjacent separator plates in a planar, solid oxide fuel cell stack, comprising: at least one glass-ceramic layer on at least one of the confronting faces of one of the separator plates, and at least one glass seal layer interposed between the at least one glass-ceramic layer and an adjacent separator plate, the at least one glass-ceramic layer being a duplex layer which comprises a first glass-ceramic layer for bonding the seal to the one separator plate, and a second glass-ceramic layer superimposed on the first glass-ceramic layer, the at least one glass seal layer being interposed between the second glass-ceramic layer and the adjacent separator plate, the second glass-ceramic layer being substantially thicker than the first glass-ceramic layer, the first and second layers being of different compositions to bond the seal to a surface of the separator plate in the first layer, while also matching a thermal expansion coefficient of the second layer with respect to a thermal expansion coefficient of the separator plate to which it is attached.