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Sol–Gel Synthesis of Ca3(PO4)2 and Ca3 – xNa2x(PO4)2 Powders for the Fabrication of Bioceramics by 3D Printingстатья
Дата последнего поиска статьи во внешних источниках: 1 июня 2022 г.
- Авторы: Larionov D.S., Bitanova V.A., Evdokimov P.V., Garshev A.V., Putlyaeva V.I.
- Журнал: Inorganic Materials
- Том: 58
- Номер: 3
- Год издания: 2022
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 302
- Последняя страница: 310
- DOI: 10.1134/S0020168522030098
- Аннотация: We report techniques for the synthesis of microcrystalline powders of tricalcium phosphate (TCP)(β-Ca3(PO4)2) and phase A (Ca2.5Na(PO4)2, an ordered solid solution based on Ca3 – xNa2x(PO4)2 α-rhenanite),by the Pechini sol–gel process. The phosphorus-containing reagents used are triethyl phosphate(TEP), PO(OC2H5)3, and ethylenediamine(tetramethylenephosphonic acid) (EDTMP),(H2O3PCH2)2N(CH2)2N(CH2PO3H2)2. We analyze the phase composition, micromorphology, and sinteringbehavior of the synthesized powders. The use of TEP as a phosphorus-containing reagents leads to achange in Ca/P ratio (stoichiometry) in the final product as a result of TEP vaporization during gel polycondensationand the formation of a mixture of hydroxyapatite (Ca10(OH)2(PO4)6) and calcium oxide. If EDTMP isused, the stoichiometry remains unchanged owing to Ca2+ chelating by the complexone: in TCP synthesis,gel thermolysis at temperatures from 750 to 1000°C leads to β-TCP crystallization (with an average particlesize of 1 μm); in the synthesis of phase A, gel thermolysis at temperatures from 500 to 800°C leads to the formationof a mixture of β-TCP, β-CaNaPO4, and phase A (average particle size of 250 nm in the range 500–700°C). According to dilatometry data, the synthesized powders can be densified more rapidly in comparisonwith powders prepared by ceramic processing route. The present results suggest that sol–gel processing withthe use of EDTMP can be recommended for the synthesis of powders of resorbable phosphates, such as TCP andCa3 – xNa2x(PO4)2, suitable for stereolithographic fabrication of osteoconductive bioceramics.
- Добавил в систему: Путляев Валерий Иванович