Investigation into synthetic condition of tricalcium phosphate containing silicon for bone-repairing material

Abstract

Calcium phosphate powders with Ca/ (P+Si) molar ratio of 1.5 and Si/ (P+Si) molar ratio of 0.125 were prepared by a wet chemical method, at different pH in the range of 6.00-8.50. The resultant powders were heated at 1100 C or 1250 C in air for 3 h. With increasing pH value, the transition temperature from beta tricalcium phosphate (beta-TCP) to alpha-TCP decreased. It was supposed that silicon was doped in alpha-TCP. While pH value was over 8, samples heated at 1250 C contained hydroxyapatite (HA). Therefore, synthetic condition at pH 7.75-8.00 is suitable for the synthesis of silicon-doped alpha-TCP.