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A method to produce porous ceramics enables that pore size is flexible, pores are interconnected, and porosity ranges from 62% to 82.5%.
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Overview The University of North Dakota has developed a method to produce porous ceramics in about 1/4 the time of standard methods. The ceramic precursors that may be used include metals, carbides, nitrides, and MAX phase, alone or in combination, and in essentially any shape that can be case or cold-pressed. Pore size is flexible, pores are interconnected, and porosity ranges from 62% to 82.5%. Applications Filtration (e.g. molten metals, particulates from exhaust gases Radiant burners Catalyst supports Kiln furniture Solid oxide fuel cells Electrodes Heat exchangers Other filtration and insulation applications Advantages Wide range of ceramic precursors may be used Three steps: 1. Mix precursor and pore former, 2. cold press or cast to desired shape, 3. heat for 10 hours Pores are interconnected Layering different ceramics within one piece Retain metal core if desired As strong as standard methods Technology Ceramic precursors (as metals, carbides, nitrides, and/or MAX phase) are mixed with powdered pore-forming materials such as graphite, molybdenum oxides, and certain polymers. The mixture is cold-pressed or cast into shape, and heated to simultaneously oxidize the precursor and vaporize the pore-forming material. Reference UND #13-17~ Patent Pending