Effect of sintering conditions on physical properties of carbonated hydroxyapatite ceramics

• Дата: 2008
• Автори: Tkachenko, M.V., Zyman, Z.Z.
• Формат: Стаття
• Мова: English
• Опубліковано: НТК «Інститут монокристалів» НАН України 2008
• Назва видання: Functional Materials
• Теми: Technology
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/136550
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Effect of sintering conditions on physical properties of carbonated hydroxyapatite ceramics // M.V. Tkachenko, Z.Z. Zyman // Functional Materials. — 2008. — Т. 15, № 4. — С. 574-579. — Бібліогр.: 12 назв. — англ.

The carbonated hydroxyapatite powder was obtained by reaction of calcium carbonate with ortho-phosphoric acid. The compacted powder samples were sintered in the 800- 1000°C range in dry carbon dioxide atmosphere under atmospheric pressure. It is revealed that ceramics synthesized in such conditions is the AB type carbonated hydroxyapatite. The carbonization kind varies from mainly B type (at relatively low sintering temperatures) to mainly A type (at high ones). The carbonic gas atmosphere did not allow to suppress disintegration of a carbonated apatite at a sintering temperatures above 1100°C, a partial decomposition of the B type apatite occurs with calcium oxide release. As a result, porosity of the ceramics increases and its mechanical properties drop sharply. However, at temperatures below 1100°C, the carbon dioxide favors the activated shrinkage of compacts due to accelerated diffusion migration of the powder particles. In particular, the maximum density of ceramics (~94% from the theoretical value) is reached at 1000°C.