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 <$E symbol Р>C range in dry carbon dioxide atmosphere under atmospheric pressure. It is revealed that ceramics synthesized in such conditions is the AB type carbonated hydroxyapatite. The carbonization kind varies from mainly B type (at relatively low sintering temperatures) to mainly A type (at high ones). The carbonic gas atmosphere did not allow to suppress disintegration of a carbonated apatite at a sintering temperatures above 1100 <$E symbol Р>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 <$E symbol Р>C, the carbon dioxide favors the activated shrinkage of compacts due to accelerated diffusion migration of the powder particles. In particular, the maximum density of ceramics (~ 94 % from the theoretical value) is reached at 1000 <$E symbol Р>C.

• Ткаченко Максим Васильович (медичні науки)
• Ткаченко Мирослав Володимирович (технічні науки)

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