Ceramics Based on Powder Mixtures Containing Calcium Hydrogen Phosphates and Sodium Salts (Na2CO3, Na4P2O7, and NaPO3)

Ceramic materials in the Na 2 O–CaO–P 2 O 5 system have been produced using powder mixtures containing calcium hydrogen phosphates (monetite/brushite: CaHPO 4 /CaHPO 4 ∙ 2H 2 O) and sodium salts (Na 2 CO 3 ∙ H 2 O, Na 4 P 2 O 7 ∙ 10H,O, and NaPO 3 ). These salts were used as precursors to the following high-temperature phases: Сa 2 P 2 O 7 , Na 2 O, Na 4 P 2 O 7 , and NaPO 3 . The amount of the salts in the powder mixtures was such that the oxide composition of the ceramics corresponded to 10 mol % sodium oxide for each mixture in the Na 2 O–CaO–P 2 O 5 system. The powder mixtures were prepared using mechanical activation in acetone, which was accompanied by monetite rehydration to brushite. X-ray diffraction characterization showed that, after firing, the phase composition of the ceramics produced from the powder mixtures thus prepared lay in the Сa 2 P 2 O 7 –NaCaPO 4 –Na 2 СaP 2 O 7 –Са(РО 3 ) 2 phase field. The resultant ceramic materials contain biocompatible and bioresorbable phases and can be recommended for bone implant fabrication.