水熱処理によるCaO-P_2O_5-SiO_2-Al_2O_3系複合体上への水酸アパタイトの生成

概要

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Nine kinds of composite powders in CaO-P_2O_5-SiO_2-Al_2O_3 system were prepared by the sol-gel process. Although the as-prepared powders were amorphous, hydroxyapatite(HAp)and tricalcium phosphate(TCP)were formed as a calcium phosphate phase when they were heated from 800 to 1300℃. Additionally, anorthite(CaAl_2Si_2O_8)was formed in the composites containing 25 mol% of Al_2O_3 and 25 mol% of SiO_2 at 1100℃. The dense composite of 2.69 g・cm^-3 bulk density was obtained by sintering powders with compositions of 38.48CaO・11.52P_2O_5・25SiO_2・25Al_2O_3 at 900℃ for 5h. When this composite was hydrothermally treated at 160℃ for 24h, β-TCP was changed into HAp to form a porous layer with the 〜8 μm thickness on the surfaces of composites. The porous composite of 2.33 g・cm^-3 bulk density was obtained when the powders with the compositions of 40CaO・10P_2O_5・10SiO_2・40Al_2O_3 were sintered at 1200℃ for 5h. Ricelike HAp particles were formed on the surfaces and fracture surfaces of the porous composite treated hydrothermally at 160℃ for 12h.
社団法人日本セラミックス協会の論文
1995-10-01