Please use this identifier to cite or link to this item: doi:10.22028/D291-24371
Title: Synthesis of an alumina coating from chelated aluminium alkoxides
Author(s): Nass, Rüdiger
Schmidt, Helmut K.
Language: English
Year of Publication: 1990
OPUS Source: Journal of non-crystalline solids. - 121. 1990, 1/3, S. 329-333
SWD key words: Aluminium oxydatum
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: Chelating agent, such as acetylacetone (AcAcH) and ethylacetoacetate (EAA) are used to avoid the undersirable precipitation of gelatinuous aluminum hydroxides during hydrolysis of aluminum-sec-butoxides, Al(OBus). This procedure leads to alumina sols with particle size distributions in the range of 1 to 15 nm which depend on the type of chelating agent as well as on the molar Al(OBus)3/chelating agent ratio. Generally, EAA leads to particles smaller than AcAcH. Because of the small particle size, gel powders are X-ray amorphous and do not crystallize at temperature < 750°C. Crystallization of á-alumina starts between 950 and 1000°C. Complete transformation to á-alumina is achieved between 1050 and 1100°C. Coating experiments with different sols on silica glass lead to nearly crack-free dried gel films with AcAcH system. An ultrafine, dense microstructure is obtained.
Link to this record: urn:nbn:de:bsz:291-scidok-26672
Date of registration: 29-Jan-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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