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The invention from the University of Bayreuth uses the internal oxidation for specific material influecing in the production of highly porous and temperature-stable ceramics.This way the porous structures of materials in terms of porosiry, pore size distribution and surface can be influenced in a targeted way. The invention could be used for filters, catalyst support, insulation and much more applications.
Picture: Porous structure from zircon oxide
The production of highly porous ceramics is carried out in most cases about the powder route. The setting of the porosity of the material is normally realised with the help of placeholders which are removed after the sintering from the structure. Essential qualities of these porous structures are, for example, porosity, pore size distribution and specific surface. Such materials find application as a filter material or catalyst support. Ceramic materials are suited for these applications because they are resistant to high temperatures.
Invention
The invention-appropriate procedure uses the so-called internal oxidation with alloys to influence their microstructure. The internal oxidation uses the different oxidation inclinations of the elements. For an efficient process the oxygen partial pressure in the stove atmosphere with the warm treatment of an alloy is adjusted in a way that it is possible for the base metals to oxidise already, while the nobler metal do not oxidise yet. Thus an exclusive oxidation of the base metal is thereby caused, also in the material inside. In this provisional stage the oxide particles are embedded in a metallic matrix. Grain size, grain form and volume shares of the oxide particles are being adjusted by the procedure parametres and process parametres. The whole metal is taken away from the structure by an acid process and the oxide scaffolding stays behind in the form of a porous ceramics.
Advantages
The new draughts for influencing microstructures which go beyond the possibilities of the powder route. Coherent oxide structures also with very high porosity. Particle dimensions and thus also specific surfaces are adjustable by process parametre.
Market potential
the invention can be used in the chemical industry, for catalyst support, for filter materials, warm insulating layers, etc
Patent (B71057)
If you are interested in the patent of this invention, please contact
Dr. Hans-Joachim Burghardt
Business Mathematician
IP Licensing Physical Sciences
Phone +49 89 5480177-32
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