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Verfahren zur Herstellung von mit einer poroesen alpha-Al2O3 -Schicht versehenen Substraten, nach dem Verfahren erhaltene Substrate sowie Beschichtungsmittel zur Durchfuehrung des Verfahrens

Process for the manufacture of substrates coated with alpha-Al2O3
 
: Schmidt, H.; Nass, R.; Sporn, D.; Brehler, K.P.; Egger, C.

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Frontpage ()

DE 1990-4016637 A1: 19900523
DE 1991-4116522 A: 19910521
DE 4116522 C2: 19940818
C04B0041
German
Patent, Electronic Publication
Fraunhofer ISC ()

Abstract
The invention relates to a process for the production of substrates coated with -Al<-2 O<-3 by the hydrolytic condensation of aluminium compounds. Hydrolyzable aluminium compounds based on the general formula of AlRR'R'', where R, R' and R'' each mean branched or unbranched alkyl, alkoxyl or acyloxy groups or anions are converted into aluminium/ diketone compounds before hydrolysis with diketones of the formula 1 where R->1, R->2 and R->3 mean branched or unbranched alkyl or alkoxyl or hydrogen atoms respectively. The aluminium/ diketone complex compounds are condensed. The substrates are coated with a colloidal solution of the condensed aluminium/ diketone complex compounds and heated to temperatures of >= 900C

: http://publica.fraunhofer.de/documents/PX-39332.html