Fabrication of alumina ceramics from powders made by sol–gel type hydrolysis in microemulsions |
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Authors: | Gregor Schinkel, Immo Garrn, Benjamin Frank, Ulrich Gernert, Helmut Schubert,Reinhard Schom cker |
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Affiliation: | aTechnical University of Berlin, Institute of Chemistry, Straße des 17, Juni 124, D-10623 Berlin, Germany;bGühring oHG, R&D, Winterlinger Straße 12, D-72488 Sigmaringen-Laiz, Germany;cTechnical University of Berlin, ZELMI, Straße des 17. Juni 135, D-10623 Berlin, Germany;dTechnical University of Berlin, Institute of Materials Science and Technologies, Englische Str. 20, D-10587 Berlin, Germany |
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Abstract: | The engineering aspects of the preparation of nanostructured alumina ceramic precursors by alcoholate hydrolysis using microemulsions as reaction media are investigated here. The precipitate was subjected to several treatment steps. Although the properties of the primary precipitated powders are independent of the chemical or reaction engineering parameters of the precipitation procedure, the structure of treated powders and sintered, dense ceramics strongly depends on thermal and mechanical handling like crystallization or grinding of the alumina ceramic precursor. Strong differences are manifested in relative densities and sintering kinetics and can be observed by SEM analysis. |
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Keywords: | Powder processing Alumina Sol– gel Nanostructure Microemulsion |
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