噴霧熱分解法により合成したリン酸三カルシウム粉体の性状

概要

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Crystalline tricalcium phosphate (TCP) was directly prepared by the spray-pyrolysis technique from ethanol-nitric acid solution of calcium nitrate and phosphoric acid. The concentration of the solution ([Ca^<2+>] + [PO<3->_4])was 0.05-1.O mol/l. The spray-pyrolysis temperature ranged from 1100° to 1400℃. TCP powders of the a form were obtained under all experimental conditions studied. When the temperature of the powders being produced in the reaction zone was lower than the β→a phase transformation temperature, metastable a - TCP was obtain2ed, though the β phase is thermodynamically stable. On the other hand, stable a - TCP was obtained when the temperature of the powders was higher than the transformation temperature. With increasing spray-pyrolysis temperature and decreasing solution concentration, the temperature at which a→β phase transformation started in as-prepared a - TCP increased and the fraction of the phase transformation decreased. For the stable a - TCP obtained from the solution of 0.05 mol/l at spray-pyrolysis temperatures above 1250℃, no transformation to P phase was observed by heat-treatment in the stable temperature range of β- TCP for 1 h.
社団法人日本セラミックス協会の論文
1988-02-01