抄録
The phase stability in the pseudoquaternary CaO-SiO2-Al2O3-Fe2O3 system has been studied up to 1973K. The samples were prepared so that the mean chemical compositions were distributed between the end members of P2O5-bearing Ca2SiO4 (C2S(ss)) and Ca2AlxFe1-xO5 (x =0.24, 0.5 and 0.7). They were examined by electron probe microanalysis, optical microscopy and powder X-ray diffractometry. With x = 0.5, the α-C2S(ss) and liquid coexisted in equilibrium above 1651K. When the α-C2S(ss) and liquid above 1651K were cooled, both the remelting reaction of the α-C2S(ss) and the fractional crystallization of the liquid simultaneously occurred. In the latter reaction, the crystallized ferrite became enriched in Fe2O3 with respect to Al2O3, thus the relative composition of the differentiated liquid was reversed. During further cooling, the aluminate was crystallized out of the liquid. The resulting phase compositions were therefore distinct from those which were thermodynamically most stable.
