Title:
MANUFACTURE OF CALCIUM PHOSPHATE MOLDED SHAPE
Document Type and Number:
Japanese Patent JPS6157310
Kind Code:
A
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 in 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 smooth with a hydrophobic polymer or metal, drying the slurry at 130°C or below to give a ceramic green body of calcium phosphate, and sintering the green body at 800 to 1400°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 I green body of calcium phosphate is sintered to give a ceramic article of desired shape with no cracking.
More Like This:
Inventors:
NAKAMURA SEISHIRO
OGAMI KATSUTOSHI
OGAMI KATSUTOSHI
Application Number:
JP17724784A
Publication Date:
March 24, 1986
Filing Date:
August 24, 1984
Export Citation:
Assignee:
KURARAY CO
International Classes:
A61K6/838; B28B1/20; C04B35/447; C04B35/64; (IPC1-7): B28B1/20; C04B35/64
Attorney, Agent or Firm:
Honda Ken