Phosphoric Acid → Tricalcium Phosphate

Participants

Reaction Steps

Twenty kilograms of CaCO3 was mixed with 44 kg of H3PO4 (89%) and the resulting mixture was fired at 1,300° C. for 2 hours. The atomic Ca/P ratio in the fired product was about 0.5. The fired product was ground into a powder so that the particles of 5 μm or greater in size would be 40% on trommel. The powder was put into a 1% aqueous solution of methyl cellulose and stirred to form a calcium phosphate slurry. The previously prepared base material was immersed in the slurry and thereafter dried and fired in air atmosphere at 700° C. to have the surface of the base material covered with the first layer of calcium phosphate.

Provenance & Evidence