Process for preparing powdered ceramic raw materials of complex

Details Process for preparing powdered ceramic raw materials of complex Process for preparing powdered ceramic raw materials of complex

1986-04-16

1989-04-11

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

264 56, 501135, 501136, 501137, C04B 3546

Patent

active

048206687

ABSTRACT:
A process for preparing a powdered ceramic raw material, comprising the steps of; (a) adding gaseous carbon dioxide or a precipitant composed of a water-soluble carbonate to the first aqueous solution containing at least one nitrate or chloride of elements selected from the group consisting of Ba, Sr, Ca and Mg until the pH of the solution is reached to a predetermined value within the range of 7 to 10 to precipitate at least one carbonate of said elements, (b) adding ammonia gas or a precipitant composed of an aqueous solution of a water-soluble hydroxide to the second aqueous solution of at least one nitrate or choride of elements selected from the group consisting of Ti, Zr and Sn until the pH of the solution is reached to a predetermined value within the range of 7 to 10 to precipitate at least one hydroxide of said elements, (c) adding ammonia gas or a precipitant composed of an aqueous solution of a water-soluble hydroxide to the third aqueous solution of lead acetate or lead nitrate until the pH of the solution is reached to a predetermined value within the range of 7 to 10 to precipitate lead hydroxide, (d) mixing the carbonate precipitated from the first aqueous solution, the hydroxide precipitated from the second solution, and hydroxide precipitated from the third aqueous solution; and (e) treating the resultant mixture with heat to form complex oxides of said elements.

REFERENCES:
patent: 3983077 (1976-09-01), Fuller et al.
patent: 4537865 (1985-08-01), Okabe et al.
patent: 4624808 (1986-11-01), Lange
"Reactive Powders from Solution", D. W. Johnson and P. K. Gallagher, in Ceramic Processing Before Firing, Eds. Onoda and Hench, John Wiley & Sons, N.Y., 1978, pp. 134-135.

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