Ca_3(PO_4)_2-CaMg(SiO_3)_2-MgSiO_3-SiO_2系の相関係

概要

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The phase diagram in the system C_3P-CMS_2-MS-S was studied because it corresponds to a composition region for manufacturing fused calcium magnesium phosphate fertilizer and for corrosion of refractories. In the quaternary system, phase diagrams of C_3P-CMS_2-S and C_3P-MS were reported already. In this report, the phase relation in the system C_3P-CMS_2-MS and a part of the quarternary system were investigated. The former ternary system has a β-C_3P (whitlockite), diopside solid solution (ss.) and pigeonite-protoenstatite ss. fields covering a wide region of the ternary diagram. In the quarternary system, ternary eutectics among β-C_3P, diopside, tridymite continues from 1277℃ in the system C_3P-CMS_2-S to 1245℃ in the system C_3P-MS-S. This composition of the lowest eutectic temperature corresponds to the fertilizer composition and it gives a suggestion for the manufacture of apatite ceramics as biomaterials. The pigeonite ss. and protoenstatite ss. exist at a higher temperature region in contact with the diopside ss. field, but the phase boundary between pigeonite ss. and protoenstatite ss. has not been clearly determined.
社団法人日本セラミックス協会の論文
1997-01-01