Combining Calcium Polyphosphate with Hydroxyapatite for CPP/β–TC Biphasic Calcium Phosphate Bio–ceramic

A novel biphasic calcium phosphate (BCP) amorphous CPP/crystalline β–TCP was prepared by adding calcium polyphosphate (CPP) into hydroxyapatite (HA). The effects of CPP dosage (mass fraction) on the phase compositions, sintering property, and mechanical strength of the composite were investigated. Results show that CPP would react with HA to produce β–calcium phosphate (β–TCP) and H2O, excessive dosage of CPP (>10%) would obtain a novel BCP (β–TCP and amorphous–CPP), and less dosage of CPP (<10%) would obtain a traditional BCP (HA/β–TCP). Meanwhile, high compressive strength could be obtained either at high sintering temperature (>1250oC) with small (0–15%) CPP dosage or at high CPP dosage (15–30%) at intermediate sintering temperature (1150–1250 oC).