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US 7,045,239 B2Granted
Laminated structure and method of forming same
AssigneeCeramic Fuel Cells Limited
InventorsRichard Donelson, Theresa Lin
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AssigneeCeramic Fuel Cells Limited
InventorsRichard Donelson, Theresa Lin
Estimating the term…
A method of alleviating edge curling when laminated structures comprising layers of green material having different shrinkage rates are sintered comprises applying to a face (18) of edges (14) the first layer (10) having the higher shrinkage rate green sinterable material, opposite to the second layer (12) having the lower shrinkage rate green sinterable material, an edge strip (16) of a green sinterable material also having a shrinkage rate lower than the first layer, and then firing the laminated structure. The edge strip may be partly or, advantageously, wholly embedded in the first layer. The sinterable materials of the second layer and edge strip may be the same or similar. The invention is particularly applicable to solid oxide fuel cell sub-structures in which the first layer is the anode layer and the second layer is the electrolyte layer.
A method of forming a sintered laminated structure comprising laminating first and second layers of green sinterable material so that the second layer is on one face of the first layer and extends to at least one edge of the first layer, the material of the second layer having a shrinkage rate during firing which is less than that of the material of the first layer, applying an edge strip of green sinterable material to an opposite face of the first layer along said at least one edge to form with the first and second layers a green laminated structure, the material of said strip having a shrinkage rate during firing which is less than that of the material of the first layer, and firing the green laminated structure to form the sintered laminated structure.
A green laminated structure comprising a first layer of green sinterable material having a first shrinkage rate during firing and a second layer of green sinterable material on one face of the first layer extending to at least one edge of the first layer, the material of the second layer having a second shrinkage rate during firing which is less than the first shrinkage rate, and wherein the laminated structure has an edge strip of green sinterable material disposed on an opposite face of the first layer along said at least one edge, the material of said strip having a shrinkage rate during firing which is less than said first shrinkage rate.
A sintered laminated structure which is substantially flat along at least one edge, comprising a first layer of sintered material having a first porosity, a second layer of sintered material on one face of the first layer and extending to at least one edge of the first layer, the sintered material of the second layer having a porosity less than the first porosity, and an edge strip of sintered material on an opposite face of the first layer extending along said at least one edge, the porosity of the material of said edge strip being less than the first porosity, wherein said sintered laminated structure is formed by laminating said first and second layers as respective layers of green sinterable material so that the second layer is on said one face of the first layer and extends to said at least one edge of the first layer, the green sinterable material of the second layer having a shrinkage rate during firing which is less than that of the green sinterable material of the first layer, applying said edge strip as an edge strip of green sinterable material to an opposite face of the first layer of green sinterable material alone said at least one edge to form with the first and second layers a green laminated structure, the green sinterable material of said edge strip having a shrinkage rate during firing which is less than that of the green sinterable material of the first layer, and firing the green laminated structure.
Dependencies are inferred from the claim text.