Powder Mixtures Based on Calcium Hydroxyapatite and Sodium Salts

Safronova, T.V.; Putlyayev, V.I.; Knotko, A.V.; Filippov, Y.Y.; Klimashina, E.S.; Ryzhov, A.P.; Saidzhonov, B.M.

Авторы: Safronova T.V., Putlyayev V.I., Knotko A.V., Filippov Ya Yu, Klimashina E.S., Ryzhov A.P., Saidzhonov B.M.
Журнал: Inorganic Materials: Applied Research
Том: 9
Номер: 4
Год издания: 2018
Первая страница: 726
Последняя страница: 731
DOI: 10.1134/S2075113318040342
Аннотация: Powder mixtures based on calcium hydroxyapatite (HAP) and sodium salts in the amount corresponding to 25 mol % of Na2O in the Na2O–CaO–P2O5 system were studied by isothermal exposures in the range of 600—1200°C. According to XRD data, the phase composition of the samples of HAP/Na2CO3 after calcination included HAP, β-CaNaPO4, and CaO. The phase composition of the ceramic samples from the HAP/Na2HPO4 powder mixture after calcination contained the phases of β-CaNaPO4 and Na4P2O7. The phase composition of the ceramic samples from the powder mixture of HAP/NaH2PO4 after calcination contained Ca2P2O7, Ca10Na(PO4)7, β-CaNaPO4, CaNa2P2O7, and Na4P2O7. The presence of sodium salts in the amount corresponding to 25 mol % of Na2O in the Na2O–CaO–P2O5 system provided the occurrence of liquid-phase sintering in compact preforms from the studied powder mixtures. However, the presence of the water-soluble salt Na4P2O7 in ceramic samples of HAP/Na2HPO4 and HAP/NaH2PO4 after calcination imposes a restriction on the use of such materials in contact with an aqueous medium. And the presence of CaO in the HAP/Na2CO3 samples excludes the use of such materials as bone implants. Keywords: bioceramics, hydroxyapatite, sodium carbonate, sodium hydrogen phosphate, sodium dihydrogen phosphate, tricalcium phosphate, rhenanite, double sodium calcium pyrophosphate, sodium pyrophosphate, Na-substituted tricalcium phosphate The studies are supported by the Russian Foundation for Basic Research (grants nos. 16-08-01172, 16-53-00154, 15-03-09387, 15-38-70047, ofi-15-29-04871).
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