Method of preparing ceramic powders using chelate precursors

C - Chemistry – Metallurgy – 04 – B

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C04B 35/46 (2006.01)

Patent

CA 2643897

Wet-chemical methods involving the use of water-soluble hydrolytically stable metal-ion chelate precursors and the use of a nonmetal-ion-containing strong base can be used in a coprecipitation procedure for the preparation of ceramic powders. Examples of the precipitants used include tetraalkylammonium hydroxides. 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.

La présente invention concerne des procédés par voie humide qui mettent en oeuvre des précurseurs chélates d'ions métalliques hydrosolubles et stables d'un point de vue hydrolytique et une base forte contenant des ions non métalliques dans le cadre d'une opération de coprécipitation pour préparer des poudres céramiques. Les précipitants utilisés sont par exemple des hydroxydes de tétraalkylammonium. Du titanate de baryum à composition modifiée est une des poudres céramiques que cette invention permet de produire. Certains chélates d'ions métalliques peuvent être préparés à partir d'acide 2-hydroxypropanoïque et d'hydroxyde d'ammonium.

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