Method of preparing ceramic powders using ammonium oxalate

C - Chemistry – Metallurgy – 04 – B

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C04B 35/626 (2006.01) C01F 11/00 (2006.01) C01F 11/02 (2006.01) C01G 23/04 (2006.01)

Patent

CA 2658858

Wet-chemical methods involving the use of water-soluble hydrolytically stable metal-ion chelate precursors and an ammonium oxalate precipitant can be used in a coprecipitation procedure for the preparation of ceramic powders. Both the precursor solution and the ammonium oxalate precipitant solution are at neutral or near-neutral pH. A composition-modified barium titanate is one of the ceramic powders that can be produced. Certain metal-ion chelates can be prepared from 2-hydroxypropanoic acid and ammonium hydroxide.

L'invention concerne des procédés chimiques par voie humide qui mettent en oeuvre des précurseurs chélates d'ions métalliques hydrosolubles et stables d'un point de vue hydrolytique et un précipitant d'oxalate d'ammonium, et qui peuvent être utilisés dans une procédure de coprécipitation pour préparer des poudres céramiques. La solution de précurseur et la solution de précipitant d'oxalate d'ammonium présentent un pH neutre ou presque neutre. Une des poudres céramiques que l'invention permet de produire est le titanate de baryum à composition modifiée. Certains chélates d'ions métalliques peuvent être préparés à partir d'acide 2-hydroxypropanoïque et d'hydroxyde d'ammonium.

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