Ceramics based on calcium hydroxyapatite synthesized from calcium acetate, calcium hydroxide, and potassium hydrophosphate

Abstract

Calcium hydroxyapatite (HAP) powder was synthesized from a water solution of potassium hydrophosphate and a suspension of calcium hydroxide in a water solution containing calcium and potassium ions, hydroxide ions, and acetate ions. The Ca(OH)2 amount in the calcium containing component was 50, 75, and 100%. The HAP powder synthesized was used to produce ceramic. After kilning at 700°C the density of the ceramic obtained from the HAP powder containing a by-product of the reaction was 2.9 – 2.6 g/cm3 and bending strength 35 – 45 MPa with grain size 200 nm. The phase composition was represented by HAP and calciumpotassium double orthophosphate. After kilning at 1200°C the density of the HAP-based ceramic made from powder with no by-product of the reaction was 2.2 – 2.3 g/cm3 and the bending strength was 45 – 55 MPa with grain size 500 – 1000 nm.