Reaction mechanism of cancellous bovine bone calcination for preparing β-TCP/HAP/Ca₂P₂O₇ porous bioceramic

Cancellous bovine bone (CBB) as starting materials was treated by a series of degreasing and then calcined at low temperature. By adjusting the concentration of soaking solution NH₄H₂PO₄ and the calcination temperature, β-TCP/HAP/Ca₂P₂O₇ multiphasic bioceramic material was prepared with porous structure of natural bone. The phase composition of the calcined specimen was characterized by XRD and the reaction mechanism was discussed by FTIR and TG. Results show that the concentration of soaking solution NH₄H₂PO₄ has a significant effect on the phase composition of the specimen. Porous bioceramic materials with different phase composition can be prepared by controlling the concentration reasonably. The phase composition was also influenced by the amount of OH^- which came from HAP decomposition (x) and which reacted with NH₄H₂PO₄ (3 m). When x>3 m, the product was mainly composed of HAP and β-TCP. When x<3 m, the procuct may contain HAP/β-TCP/Ca₂P₂O₇ or β-TCP/Ca₂P₂O₇. Only as x=3 m, pure β-TCP could be gained.