Compositions: ceramic – Ceramic compositions – Aluminum compound containing
Reexamination Certificate
2005-01-11
2005-01-11
Marcheschi, Michael A (Department: 1755)
Compositions: ceramic
Ceramic compositions
Aluminum compound containing
C501S127000, C051S309000, C423S624000, C427S457000, C427S458000, C427S532000, C427S372200
Reexamination Certificate
active
06841497
ABSTRACT:
The invention relates to the field of technical ceramics and specifically relates to a method of synthesis for aluminum oxides of different crystalline structure and to the products obtained by the method. The aim of the invention is to provide a method of producing redispersible nanoparticulate corundum and nanoporous Al2O3sintered products, the method using precursors and being viable on a commercial scale. To this aim, inter alia, a method of producing redispersible nanoparticulate corundum of an average particle size of D50<100 nm is used which method includes the addition of crystal nuclei. According to the method, organic or chlorine-free inorganic precursors are dissolved or processed to a sol and hydrolyzed. The substance is then dried and calcinated at temperatures of between 350 and 650° C. and is then further heated by increasing the temperature to ≦950° C. The aim of the invention is also attained by using a method of producing nanoporous Al2O3sintered products according to which organic or chlorine-free inorganic precursors are dissolved or processed to a sol and hydrolyzed. The substance is then dried and calcinated at temperatures of between 350 and 750° C.
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Krell Andreas
Ma Hongwei
Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung
Greenblum & Bernstein P.L.C.
Marcheschi Michael A
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