Process for forming calcium phosphate ceramic articles

Details Process for forming calcium phosphate ceramic articles Process for forming calcium phosphate ceramic articles

1985-08-21

1987-10-13

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264311, C04B 3332

Patent

active

046997423

ABSTRACT:
An improved process for producing shaped ceramic articles of calcium phosphate by reacting calcium ions with phosphate ions in an aqueous medium at pH 8 or up to give gelatinous precipitates of calcium phosphate, with the molar ratio of calcium to phosphorus being 1.45 to 1.75, dispersing the precipitates into an aqueous medium to give a slurry containing 5 to 25 wt % of solids, casting the slurry into a mold conforming to the desired shape of the article and having the mold face finished sooth with a hydrophobic polymer or metal, drying the slurry at 130.degree. C. or below to give a ceramic green body of calcium phosphate, and sintering the green body at 800.degree. to 1400.degree. C., wherein said improvement comprises casting the slurry into a centrifuge tube which functions as a mold, centrifugally separating the slurry into a supernatant layer and a precipitate layer containing less than 73 wt % of water with a centrifugal force greater than 1100 G, removing the supernatant liquid from the centrifuge tube, and drying the precipitate layer in the centrifuge tube. The green body of calcium phosphate is sintered to give a ceramic article of desired shape with no cracking.

REFERENCES:
patent: 2304723 (1942-12-01), Wolff et al.
patent: 2936505 (1960-05-01), Witucki et al.
patent: 4097935 (1978-07-01), Jarcho
patent: 4312821 (1982-01-01), Jarcho et al.
patent: 4624808 (1986-11-01), Lange
Inorganic Syntheses, vol VII, pp. 63-65.

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