METHOD OF PREPARING ALPHA- AND BETA-TRICALCIUM PHOSPHATE POWDERS

摘要

The invention describes a wet-chemical process for the preparation ofalpha- and beta-tricalcium phosphate (TCP) powders. The proceduresimply comprises immediate addition of di-ammonium hydrogenphosphate to an aqueous solution of calcium nitrate tetrahydrate, or viceversa. Calcination of the recovered precursor powders at 800°C in airproduces beta-TCP, whereas the calcination of the same at 1200°C,followed by rapid cooling to room temperature yields submicron-particulated alpha-TCP powders. These powders can be the raw materialsfor bioceramics, such as artificial bones, artificial joints, artificial toothroots, and calcium phosphate-based self-setting, self-hardening cements.