(US5702837-A)      The material for bonding anode-to-anode material in a solid oxide fuel stack is formed of powders of: (i) reactive ingredients; (ii) nickel oxide; (iii) zirconia; and (iv) at least one of alumina, binder, plasticiser, rice or corn starch and a solvent. The reactive ingredients are selected from compounds of tungsten, tantalum, niobium, molybdenum and titanium and compounds of these elements with nickel, zirconium, silicon and aluminium. The binder is selected from polyvinyl butyryl resin, polyvinyl alcohol, synthetic rubber, plastic, cellulose and polymer systems which thermally decompose without crosslinking. The plasticiser is butyl phthalate or a phthalate solvent. The solvent may be organic or inorganic, e.g. water or alcohol. The bonding material is applied as an interlayer between facing surfaces of anode pairs and is sub-sintered at 1000-1300C with or without pressure.    Also claimed is an anode-interconnect bonding material, in which the powders of reactive ingredients are selected from nickel oxide, zirconium oxide, cobalt oxide, calcium oxide and strontium oxide, and additionally comprises one or more of lanthanum oxide, chromium oxide and lanthanum chromite.    ADVANTAGE -   The resulting bond is reliable and has a strength of more than 1 MPa. It is compatible with anode and interconnect materials and is conductive in SOFC operating environments.    (EP890194-A1)      The material for bonding anode-to-anode material in a solid oxide fuel stack is formed of powders of: (i) reactive ingredients; (ii) nickel oxide; (iii) zirconia; and (iv) at least one of alumina, binder, plasticiser, rice or corn starch and a solvent. The reactive ingredients are selected from compounds of tungsten, tantalum, niobium, molybdenum and titanium and compounds of these elements with nickel, zirconium, silicon and aluminium. The binder is selected from polyvinyl butyryl resin, polyvinyl alcohol, synthetic rubber, plastic, cellulose and polymer systems which thermally decompose without crosslinking. The plasticiser is butyl phthalate or a phthalate solvent. The solvent may be organic or inorganic, e.g. water or alcohol. The bonding material is applied as an interlayer between facing surfaces of anode pairs and is sub-sintered at 1000-1300C with or without pressure.    Also claimed is an anode-interconnect bonding material, in which the powders of reactive ingredients are selected from nickel oxide, zirconium oxide, cobalt oxide, calcium oxide and strontium oxide, and additionally comprises one or more of lanthanum oxide, chromium oxide and lanthanum chromite.    ADVANTAGE -   The resulting bond is reliable and has a strength of more than 1 MPa. It is compatible with anode and interconnect materials and is conductive in SOFC operating environments.