A thermodynamic calculation of the probable reactions of interaction in mixtures of the MgO-MgCr2O4-MeC (Me=Si, Ti) system is presented. Sintering of MgO+MgCr2O4 mixture with additions of titanium and silicon carbides is investigated. It is established that the maximum density (96% of the theoretical value) of sintered specimens of MgO+MgCr2O4 mixture is attained at a 0.5% mass fraction of titanium or silicon carbide and a firing temperature of 1850°C. © 1996 Plenum Publishing Corporation.