噴霧熱分解法により調製した水酸アパタイト粉体の性質に及ぼす出発物質の影響
1996 年 104 巻 1206 号 p. 126-132
詳細
1996 年 104 巻 1206 号 p. 126-132
Nine kinds of spraying solutions with a Ca/P ratio of 1.67 were prepared by mixing calcium sources (Ca(NO3)2, CaCl2 and Ca(CH3COO)2) and phosphorus sources ((NH4)2HPO4, H3PO4 and PO(OCH3)3). Apatites powders were obtained by spray-pyrolysing the resulting solutions at 600°C; some properties of the obtained powders were examined. The stoichiometric hydroxyapatite (HAp) was obtained by spraying the solutions containing Ca(NO3)2-(NH4)2HPO4 and Ca(NO3)2-H3PO4 systems. As the solutions containing CaCl2 were sprayed, chloroapatite (CAp) and Ca2PO4Cl were formed; Ca2PO4Cl was changed into CAp during heating at 600°C. The carbonate-containing HAp was formed when the solutions containing Ca(CH3COO)2-(NH2)HPO4 and Ca(CH3COO)2-H3PO4 systems were sprayed. When PO(OCH3)3 was used as a phosphorus source, the Ca/P ratio of the apatites was below 1.67. The powder derived from Ca(CH3COO)2-(NH4)2HPO4 system showed the best sinterability among the powders examined; the relative density of the sintered body fired at 1150°C for 5h reached-96%.
