Process for the preparation of double metal oxide powders containing a Group IIIA and a Group IVB element and a novel double metal hydroxyl carboxylate useful in preparing same
First Claim
1. A process for the preparation of double metal oxide ceramic powders which contain at least one metal of Group IIIA and at least one metal of Group IVB comprising the steps of:
- (a) forming an aqueous solution of mixed metal compounds which respectively contain said Group IIIA and Group IVB metals and which compounds are selected from the group consisting of the metal salts, the metal alkoxides, and the mixtures thereof, the solution also containing a polyfunctional compound capable of chelating the metal compounds;
(b) adding an effective amount of a base to the solution formed under (a) in order to form a homogeneous double metal precipitate; and
,(c) converting the precipitate formed under (b) into a double metal oxide.
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Abstract
Disclosed is a process for the preparation of double metal oxide ceramic powders which contain at least one metal of Group IIIA, inclusive of aluminum and gallium, and at least one metal of Group IVB, inclusive of titanium and zirconium. The process involves a first step in which an aqueous solution of mixed metal alkoxides or salts is formed and which also contains a chelating agent, preferably a polycarboxylic acid, and a second step in which a base is added in order to cause precipitation of a mixed metal hydroxyl groups-containing precursor that can be calcined or otherwise converted to the final mixed metal oxide. The invention also pertains to novel double metal hydroxyl carboxylates which are useful intermediates in preparing double metal oxides.
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Citations
20 Claims
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1. A process for the preparation of double metal oxide ceramic powders which contain at least one metal of Group IIIA and at least one metal of Group IVB comprising the steps of:
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(a) forming an aqueous solution of mixed metal compounds which respectively contain said Group IIIA and Group IVB metals and which compounds are selected from the group consisting of the metal salts, the metal alkoxides, and the mixtures thereof, the solution also containing a polyfunctional compound capable of chelating the metal compounds; (b) adding an effective amount of a base to the solution formed under (a) in order to form a homogeneous double metal precipitate; and
,(c) converting the precipitate formed under (b) into a double metal oxide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15, 19)
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15. A double metal compound according to claim 12, wherein the Group IIIA metal is aluminum and the Group IVB metal is titanium.
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19. A method of using a double metal compound according to claim 12 to prepare a double metal oxide, comprising the step of subjecting said compound to sufficient heat to effect decomposition.
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13. A double metal compound in accordance with the general structural formula ##STR3## in which A represents a Group IIIA metal;
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B represents a Group IVB metal; n represents an integer greater than 1 R represents an organic radical r is 0 or 1. - View Dependent Claims (14)
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16. Aluminum-titanium-hydroxyl-oxalate.
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17. A process for the preparation of a double metal hydroxyl carboxylate containing at least one metal of Group IIIA, inclusive of aluminum and gallium, and at least one metal of Group IVB, inclusive of titanium and zirconium, comprising the steps of
(a) forming a mixed aqueous solution of compounds which contain said metals and which are selected from the group consisting of metal salts, metal alkoxides, and mixtures thereof, the solution also containing a polycarboxylic compound capable of chelating the metal compounds; - and,
(b) adding an effective amount of a base to the solution formed under (a) in order to form a homogeneous double metal precipitate. - View Dependent Claims (18)
- and,
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20. A method of using aluminum-titanium-hydroxyl oxalate to prepare aluminum titanate, comprising the step of heating the hydroxyl oxalate to a temperature of from 1000°
- C. to 1500°
C. for a sufficient period of time to effect decomposition.
- C. to 1500°
Specification