Please use this identifier to cite or link to this item:
|Title:||Synthesis of an alumina coating from chelated aluminium alkoxides|
Schmidt, Helmut K.
|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|
SciDok - Der Wissenschaftsserver der Universität des Saarlandes
Items in SciDok are protected by copyright, with all rights reserved, unless otherwise indicated.