SEALING COMPOSITE FOR FLAT SOLID OXIDE FUEL CELL STACK HAVING HIGH BREAKING-RESISTANCE AND THE FABRICATION METHOD THEREOF

摘要

A composite sealing material for a flat solid oxide fuel cell, and a method for preparing the composite sealing material are provided to improve the heat cycle stability without the deterioration of a stack by increasing the fracture toughness of glass. A composite sealing material for a flat solid oxide fuel cell comprises a glass matrix; and 5-50 vol% of an alpha-alumina fibrous reinforcing material which has an average crystal particle size of 0.2 micrometers or more and an aspect ratio of 10-100 and is contained in the glass matrix. Preferably the composite sealing material comprises further a granular alpha-alumina powder; and/or any one metal powder selected from silver(Ag), palladium(Pd), gold(Au), platinum(Pt), nickel(Ni), Fe-Ni alloy and molybdenum(Mo).