ゾル・ゲル法により調製したCaO-P_2O_5-SiO_2-B_2O_3系複合体の水熱処理による水酸アパタイトの析出

概要

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Six kinds of powders in the CaO-P_2O_5-SiO_2-B_2O_3 system were prepared by a sol-gel process. The powders consisted of various Ca/P ratios : 1.50, 1.67 and 2.00. The composites were fabricated by firing the compressed powders at 1100°C for 1h. The relative densities (bulk densities/true densities) of the composites without B_2O_3 were only 65%, whereas those of the composites with 10 mol% of B_2O_3 were as high as 98%. When these composites with B_2O_3 were hydrothermally treated at 160°C for 4-24h in NH_3 solution at a pH of 〜10, the surfaces of the composites were homogeneously coated with whisker-like hydroxyapatite (HAp) particles. However, no HAp was found from the composites without B_2O_3. The bending strengths of the composites with B_2O_3 remained unchanged after the hydrothermal treatment.
社団法人日本セラミックス協会の論文
1995-08-01