Abstract
Abstract The phase relationship in the system 3CaO·P2O5–CaO·MgO·2SiO2–SiO2 was investigated by the usual quenching method. The two partial systems 3CaO·P2O5–SiO2 and CaO·MgO·2SiO2–SiO2 have already been reported by previous investigators. Another partial system 3CaO·P2O5–CaO·MgO·2SiO2 seems to be approximately binary, whose eutectic is located at 39% of 3CaO·P2O5 and 61% of CaO·MgO·2SiO2, and at 1311±4°C. In the region rich in 3CaO·P2O5, it was observed that the crystallization velocity of diopside is rather slow under the solidus temperature, that the transition temperature of tricalcium phosphate is considerably increased with diopside content, and that β-tricalicium phosphate apparently makes solid solution with diopside (19 wt.%). The system 3CaO·P2O5–CaO·MgO·2SiO2–SiO2 is of a perfect ternary one, whose eutectic is at 36% of 3CaO·P2O5, 59% of CaO·MgO·2SiO2 and 5% of SiO2, and at 1277±3°C. Its isotherms of the liquidus surface were approximately represented.
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