The invention relates to an Al2O3-C
refractory fired by nitridation and a preparation method for the Al2O3-C
refractory. According to the technical scheme, the preparation method comprises the following steps of: mixing 55 to 94 weight percent of
corundum, 5 to 20 weight percent of crystalline
flake graphite, 1 to 30 weight percent of
metal Si
fine powder which serve as raw materials, adding a bonding agent in an amount which is 3.5 to 8 percent of the weight of the raw materials, and mixing and
grinding for 10 to 30 minutes; and pressing the mixed and ground mixture to form a raw blank of the required Al2O3-C
refractory, baking the pressed raw blank at the temperature of between 180 and 220 DEG C, putting into a high-temperature
kiln, and keeping the temperature at the temperature of between 1,350 and 1,700 DEG C under the
atmosphere of N2 for 1 to 8 hours to obtain the Al2O3-C refractory fired by the nitridation. The Al2O3-C refractory fired by the nitridation comprises a case-hardened Al2O3-C refractory
brick, an Al2O3-C protective tube for the
continuous casting of
molten steel, an Al2O3-C sliding plate for the pouring of the
molten steel and a
nozzle brick. The Al2O3-C refractory has the characteristics of high strength,
oxidation resistance, long service life and high performance of resisting the washing and
erosion of high-temperature melts.