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Chrome oxide free refractories have significant economic benefits for the development of gasification technology.Spinel based and SiC based refractories are corroded by coal slag at 1 500 ℃ under reducing atmosphere.Moreover,interactions between refractory materials and molten slag are also predicted by thermodynamic calculations under the same conditions.The results indicate that spinel based refractories are corroded by dissolution of molten slag,while SiC based refractories are corroded by oxidation of CO and Fe0.Both of the spinel and SiC based refractories show good corrosion resistance against coal slag by the present experimental tests.Finally,preliminary developed spinel-SiC composite materials are prepared and corroded by coal slag as well,the research of which shows great potential to be used in slagging gasifiers.