C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
117/110, 23/224
C01F 17/00 (2006.01) B05D 3/02 (2006.01) C01B 13/14 (2006.01) C01G 3/02 (2006.01) C04B 35/46 (2006.01)
Patent
CA 1329463
METAL OXIDE CERAMIC POWDERS AND THIN FILMS AND METHODS OF MAKING SAME ABSTRACT OF THE DISCLOSURE This invention is direted to the formation of homogeneous, aqueous precursor mixtures of at least one substantially soluble metal salt and a substantially soluble, combustible co-reactant compound, typically an amino acid. This produces, upon evaporation, a substantially homogeneous intermediate material having a concentration which would support combustion. The homogeneous intermediate material essentially comprises highly dispersed or solvated metal constituents and the co-reactant compound. The intermediate material is quite flammable. A metal oxide powder results on ignition of the intermediate product which combusts same to produce the product powder. A new chemical method of forming thin ceramic films has also been developed. An aqueous solution of metal nitrates or other soluble metal salts and a low molecular weight amino acid is coated onto a substrate and pyrolyzed. The amino acid serves to prevent precipitation of individual solution components, forming a very viscous liquid as excess water is evaporated. Using metal nitrates and glycine, the method has been demostrated for zirconia with various levels of yttria stablizaton, for lanthanum-strontium chromites, and for yttrium-barium-copper oxide superconductors on various substrates.
602401
Chick Lawrence A.
Exarhos Gregory J.
Pederson Larry R.
Battelle Memorial Institute
Oyen Wiggs Green & Mutala Llp
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