按电熔镁砂、天然鳞片石墨、沥青、Al粉、Si 粉的质量分数分别为85．5％、8％、0．5％、4％、2％，外加质量分数4％热固性酚醛树脂为结合剂进行配料，经搅拌均匀后成型，分别在1000、1200和1400℃保温3 h埋焦炭还原气氛下热处理，研究了热处理温度对试样物相组成、显微结构及强度的影响。结果表明：热处理温度为1000℃时，试样中有长条状Al4 C3和呈八面体状的MgAl2 O4生成；1200℃热处理后试样中有纤维状Al4 C3、呈八面体状的MgAl2 O4及呈片层板状的SiC生成；1400℃热处理后试样中有针状AlN、纤维状Al4 C3、呈八面体状的MgAl2 O4及大量的SiC晶须生成，形成了良好的非氧化物结合，使试样具有更高的抗折强度和优异的抗热震性能。
MgO-C refractory specimens were prepared using 85.5%(in mass,the same hereinafter)fused magnesia,8% natural flake graphite,0.5% pitch,4% metallic Al powder,2% Si powder,extra adding 4%phenolic resin as binder,batching,stirring,shaping,and carbon embedded firing at 1 000 ℃,1 200 ℃, 1 400 ℃ for 3 h,respectively.The influence of heat treatment temperature on phase compositions,micro-structure and mechanical strength of the MgO-C specimens were studied.The results show that:after heat treatment at 1 000 ℃,strip-like Al4C3 and octahedral MgAl2O4 form;after heat treatment at 1 200 ℃,fibrous Al4C3,octahedral MgAl2O4,and plate-like SiC form;after heat treatment at 1 400 ℃,needle-like AlN,fibrous Al4C3,octahedral MgAl2O4 and a large amount of SiC whiskers form,forming good non-oxides bonding, thus endowing the specimens with high MOR and good thermal shock resistance.
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