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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 1100 ℃ 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.
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 1100 ℃ in oxidizing atmosphere , and thermal shock resistance after 5 times dipping at 1600 ° C molten steel of the low-carbon composite samples were 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. heat 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.