Liquidus Relations in the Quaternary Subsystem CaAl2O3-CaAl4O7-Ca2Al2SiO7-MgAl2O4

Equilibrium diagrams for the joins CaAl₄O₇-MgAl₂O₄, CaAl₄O₄-Ca₂Al₂SiO₇-MgAl₂O₄, and Ca₂Al₂O₄–Ca₂Al₂SiO₇-MgAl₂O₄ were determined by the classical quenching method and hot stage microscopy. Liquidus relations in the quaternary subsystem are discussed. Two univariant curves are located within the composition tetrahedron. The quaternary invariant point is a peri-tectic. Technological application of results is indicated.