为了改善 MgO－SiC－C 质耐火材料的性能，以 w（SiO2）＝99．70％的分析纯二氧化硅和 w（Si）＝96．16％的工业单质硅为原料，于1450℃高温氮化合成了 Si2 N2 O 粉。然后以质量分数分别为80％的电熔镁砂（5～3、3～1、≤1和0．075 mm）、15％的碳化硅（≤1、0．088 mm）、5％的鳞片石墨粉为原料，外加0．5％的金属铝粉和3％的单质硅粉为抗氧化剂，外加4．5％的热固性酚醛树脂作为结合剂，外加合成 Si2 N2 O 粉（质量分数为0、1％、3％和5％）制备了 MgO－SiC－C 质耐火材料。研究 Si2 N2 O 粉外加量对该材料性能及显微结构的影响。结果表明：加入适量 Si2 N2 O 粉可以改善试样的物理性能以及抗氧化性能；而其 Si2 N2 O 氧化分解产生的 SiO2填充于气孔会阻塞渣渗透的通道，从而提高了试样的抗渣性能。本试验条件下，Si2 N2 O 粉加入量为1％（w）时，MgO－SiC－C质耐火材料的各项性能最佳。
Si2 N2 O powder was high temperature nitridation synthesized at 1 450 ℃ using analytically pure sil-ica (w(SiO2 )=99.70%)and industrial silicon (w(Si)=96.16%)as raw materials in order to improve the performance of MgO-SiC-C refractories.MgO-SiC-C refractories were prepared using 80% fused magne-sia (5 -3,3 -1,≤1,and 0.075 mm),15% silicon carbide (≤1 and 0.088 mm),and 5% flake graphite powder as raw materials,extra adding 0.5% aluminum powder and 3% silicon powder as antioxidants,ex-tra adding 4.5% thermosetting phenol resin as binder.Effects of extra additions of Si2 N2 O powder (0,1%, 3% and 5%)on performance and microstructure of MgO-SiC-C refractories were studied.The results show that adding an appropriate amount of Si2 N2 O can improve physical properties and oxidation resist-ance of MgO-SiC-C refractories;SiO2 decomposed from Si2 N2 O fills the pores and blocks the channel of slag penetration,improving the slag resistance.Under the experimental conditions,the performance of MgO-SiC-C refractories was the best when the addition of Si2 N2 O is 1%.
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