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Glass Cristallization-controlled Pore Retantion in Calsium-phosphate Glassceramics from Powder Sintering of CaO-P2O5-B2O3-Al2O3-TiO2-ZrO2статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 23 ноября 2017 г.
- Авторы: Buchilin N.V., Mikhailenko N.Yu, Stroganova E.E., Sarkisov P.D., Paleari A.
- Журнал: Journal of Non-Crystalline Solids
- Том: 373
- Год издания: 2013
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 42
- Последняя страница: 50
- DOI: 10.1016/j.jnoncrysol.2013.04.037
- Аннотация: The formation of a porous structure plays a key role in the synthesis of calcium-phosphate biomaterials for bone implantology and endoprosthesis, since it determines both bioactivity and mechanical strength of the final material. The results of the present investigation demonstrate the feasibility of a crystallization-controlled design of material porosity, without pore-former addition, through a low-cost glass powder sintering process. The method takes advantage of the partial crystallization of glass withmolar composition 45P2O5–50СаО–5Al2O3, with added 5B2O3, 5ZrO2, and 5TiO2, for achieving controlled pore retention and mechanical strength. The investigation — comprising differential thermal analysis, X-ray diffraction, scanning electron microscopy, viscosity, density, flexural and compressive strength measurements — gives a quantitative description of how the pore retention is driven by the systemviscosity and by the formation of a reinforcing framework of precipitated crystals, the latter ones preventing the collapse into a vitrified non-porous material. The final porosity turns out to be describable by amodified Frenkel's model accounting for the crystallization constraints to the liquid flow. As a result, the present study demonstrates the possibility of obtaining calcium-phosphate glassceramicswith 70% of crystal fraction, flexural strength 25 MPa, compressive strength 40 MPa, and a final porosity of 25% with pore sizes selectable from 10 to 180 μm from the starting grain size. Importantly, bioactivity tests show good bio-integration and pore filling with neogenic bone tissue and blood vessels, without toxicity, opening the way to possible applications in small-bone implantology
- Добавил в систему: Строганова Елена Евгеньевна