【摘要】 随着低碳钢和超低碳钢的冶炼需求的提升，连铸用低碳尖晶石-碳耐火材料的抗渣侵蚀性能和抗热震性能面临着更高的要求。本文研究了纳米碳/镁铝尖晶石复合粉（C/MgAl₂O₄）添加量对塞棒用低碳尖晶石-碳（MgAl₂O₄-C）耐火材料性能的影响。结果表明：埋碳烧结得到的复合粉主要呈形状不规则且表面粗糙的颗粒，其中纳米碳分布于MgAl₂O₄晶粒间和颗粒表面，形成独特的团簇结构。当复合粉添加量（质量分数）为6.3%（C/MA-2试样）时性能最优，相比于未添加复合粉的试样（C/MA-0）,C/MA-2试样的常温抗折强度、常温耐压强度和高温抗折强度分别提高了15.4%、19.6%和45%。同时，C/MA-2试样表现出最佳的抗热震性能，其热震后残余强度保持率比C/MA-0提高了11.9%。在抗渣侵蚀方面，C/MA-2侵蚀深度最小，比C/MA-0试样减少了19.6%,抗侵蚀性能最好。更多还原

【Abstract】 With the increasing demand for low-carbon and ultra-low-carbon steel smelting, low-carbon spinel-carbon refractories for continuous casting are subject to more rigorous requirements for slag corrosion resistance and thermal shock resistance. This study systematically investigates the effect of nano-carbon/magnesium aluminate spinel（C/MgAl₂O₄） composite powder content on the properties of low-carbon magnesia-alumina spinel-carbon（MgAl₂O₄-C） refractories for stopper rods. The results indicate that the composite powder consists primarily of irregularly shaped particles with rough surfaces, in which nano-carbon is distributed between MgAl₂O₄ grains and adhered to spinel particle surfaces, forming a unique clustered morphology. The optimal performance of MgAl₂O₄-C refractories was achieved with 6.3% composite powder addition（sample C/MA-2）, showing 15.4%, 19.6%, and 45% enhancements in the cold modulus of rupture（CMOR）, the cold crushing strength（CCS）, and the hot modulus of rupture（HMOR）, respectively, compared to the composite-free sample（C/MA-0）. Sample C/MA-2 exhibited the best thermal shock resistance, showing a 11.9% higher the thermal shock resistance of than C/MA-0. Furthermore, the erosion depth of C/MA-2 was reduced by 19.6% relative to C/MA-0, demonstrating superior slag corrosion resistance.更多还原