The low-carbon magnesia-carbon (MgO-C) composites containing 3% (mass fraction,the same below)carbon were prepared by adding various types of carbon black (CB).The mechanical properties,oxidation resistance at 1 100 0C in oxidizing atmosphere,and thermal shock resistance after 5 times dipping in 1600℃molten steel of the low-carbon composite samples were investigated,compared with a commercial high-carbon MgO-C composite containing carbon of 16%.The results show that the mechanical properties,oxidation resistance and thermal shock resistance of the low-carbon samples are improved with the decrease of CB particle size.Thermal shock resistance of the low-carbon sample containing nanometer CB N220 is obviously better than that of other low-carbon samples,and reaches the level of the high-carbon samples.
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