ZrO_2-SiC composite has been synthesized from zirconite and carbon black by car- bothermal reduction reaction in argon atmosphere,which was added to Al_2O_3-C refractory to study the improvement of oxidation resistance of the Al_2O_3-C refractory,and the effect of heating tem- perature on the synthesis of ZrO_2-SiC composite was also investigated.

The effect of mixture of rare earth oxides on the sintering properties,microstructure and mechanical properties of magnesia refractory were studied.

On the basis of mathematical analysis, the formulae have been establishea for calculating the pyrometrric solidus composition of magnesia refractory in the system M-MA-M2S-CMS.