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Ceramics in CaO-P2O5, CaO-P2O5-Na2O and CaO-P2O5-K2O systems obtained by annealing of cement stone prepared from hyghly loaded suspensions of controlled hardeningтезисы доклада
- Авторы: Toshev O.U., Stegalin G.L., Safronova T.V., Shatalova T.B., Lukina U.S., Malyutin K.V.
- Сборник: Book of Abstracts XII International Conference on Chemistry for Young Scientists «Mendeleev 2021»
- Тезисы
- Год издания: 2021
- Место издания: St. Petersburg University
- Первая страница: 336
- Последняя страница: 336
- Аннотация: This work is aimed at creating biocompatible ceramic materials in CaO-P2O5, CaO-P2O5-Na2O and CaO-P2O5-K2O systems, by heat treatment of green powder products (cement stone) formed from highly loaded hardening suspensions.Calcium citrate tetrahydrate (Ca3(C6H5O7)2•4H2O) and calcium dihydrogen phosphate monohydrate (Ca(H2PO4)2•H2O), sodium dihydrogen phosphate (NaH2PO4) and potassium dihydrogen phosphate (KH2PO4) powders were used as components of the starting powder mixtures.Then the resulting powder mixtures were mixed with water at a water-solid ratio (w/s) = 0.5 by weight. A latex form was filled with the resulting paste and prepared samples were left for hardening and drying at the air for a week.The phase composition of cement stone samples based on Ca3(C6H5O7)2•4H2O and Ca(H2PO4)2•H2O, Ca3(C6H5O7)2•4H2O and NaH2PO4, Ca3(C6H5O7)2•4H2O and KH2PO4 was represented by brushite (CaHPO4•2H2O), monetite (CaHPO4) and unreacted Ca3(C6H5O7)2•4H2O and Ca(H2PO4)2•H2O, NaH2PO4, KH2PO4 respectively. The presence of unreacted salts is associated with the incompleteness of the reactions 1-3 during the process of chemical bonding.After firing of cement stone based on Ca3(C6H5O7)2•4H2O and KH2PO4 at 500oC the phase composition of the samples was represented by the phases β-CaKPO4, Ca10(PO4)6(OH)2 and β-Ca3(PO4)2. After firing in the temperature range of 700-900oC, CaKPO4 passes into a higher-temperature modification-α-CaKPO4, and the phases of double calcium – potassium pyrophosphate K2CaP2O7 and potassium-substituted tricalcium phosphate Ca10K(PO4)7 were also observed. After firing at 900oC, only the α -CaKPO4 phase was detected in the ceramic according to X-ray diffraction data.The resulting material based on β-Ca2P2O7, β-CaNaPO4, and β-CaKPO4 which has the ability to slowly dissolve, can be used in regenerative medicine for the treatment of bone defects.Acknowledgements. This work was supported by Russian Foundation for Basic Research (project No 18-29-11079).
- Добавил в систему: Сафронова Татьяна Викторовна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Stegalin_Mendeleev2021_336.pdf | Stegalin_Mendeleev2021_336.pdf | 1,1 МБ | 23 ноября 2021 [safronova] |