الفهرس 
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Abstract
The result of phase equilibrium and microstructure of all the co-clinkered magnesite-chromite refractory samples are mainly bonded by calcium and/or magnesium silicate phases; namely, menticellite (CMS) and forsterite (M2S) phases. the degree of direct bonding of periclase and /or chrome-spinel solid solution phses is appreciably affected by silicate phases. accordingly, the co-clinkered magnesite-chrome and chrome-magnesite samples selected from the three series show dense and thermal shock resistant nature at the expense of its load-bearing capacity. the Ta is ranging between 1500 and 1600°c which indicate its lower refractory grade as compared with the corresponding of the international types which have Ta of≥1700°c.