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Densification additives for hydroxyapatite ceramicsстатья
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: 18 июля 2013 г.
- Авторы: Safronova T.V., Putlyaev V.I., Shekhirev M.A., Tretyakov Y.D., Kuznetsov A.V., Belyakov A.V.
- Журнал: Journal of the European Ceramic Society
- Том: 29
- Номер: 10
- Год издания: 2009
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 1925
- Последняя страница: 1932
- DOI: 10.1016/j.jeurceramsoc.2008.12.012
- Аннотация: The present work is aimed at the elucidation of the role played by CaCl2 and NH4NO3 (the latter is a by-product of the solution synthesis of hydroxyapatite, hereinafter referred to as HAp) in the densification of nano-sized HAp powder in the course of the pressureless sintering. Nanocrystalline HAp powderwas fabricated via the wet-precipitation technique by the dropwise addition of an (NH4)2HPO4 solution to a Ca(NO3)2 mother solution at a pre-adjusted pH at 60 ◦C. The pH of the aqueous mixture was maintained at a constant value (either 7 or 9) by the addition of an appropriate amount of NH4OH. The Ca/P ratio was set to 1.67, 1.61, and 1.48; 10 wt% of CaCl2 was added to dry HAp powder. NH4NO3 remaining in unwashed HAp powder can act as a fluxing agent that promotes partial melting at a relatively low temperature (150–250 ◦C) thus allowing the particles to rearrange into a denser packing. Several mechanisms of the CaCl2 action as a densification additive might be envisaged: (i) a decrease in the melting temperature; (ii) the surface wetting of grains; (iii) a change in the growth morphology owing to the high-temperature surfactant properties; (iv) a possible reaction with HAp on the surface of grains giving rise to the decomposition of HAp and yielding chlorapatite (ClAp), which can convert back to HAp over a wide temperature range and at any level of H2O.
- Добавил в систему: Сафронова Татьяна Викторовна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | sdarticle_Safronova_2009.pdf | sdarticle_Safronova_2009.pdf | 996,7 КБ | 26 мая 2012 [safronova] | |
| 2. | JECS-S-08-002151_15_03_2008.pdf | JECS-S-08-002151_15_03_2008.pdf | 7,5 МБ | 28 сентября 2023 [safronova] |