Abstract
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.
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Original Russian Text © T.V. Safronova, V.I. Putlyayev, A.V. Knotko, Ya.Yu. Filippov, E.S. Klimashina, A.P. Ryzhov, B.M. Saidzhonov, 2018, published in Materialovedenie, 2018, No. 1, pp. 43–48.
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Safronova, T.V., Putlyayev, V.I., Knotko, A.V. et al. Powder Mixtures Based on Calcium Hydroxyapatite and Sodium Salts. Inorg. Mater. Appl. Res. 9, 726–731 (2018). https://doi.org/10.1134/S2075113318040342
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DOI: https://doi.org/10.1134/S2075113318040342