以粒度为3～1、≤1、≤0．088 mm的高铁镁砂，≤0．088 mm的高纯镁砂为主要原料，分别研究了不同加入量（质量分数分别为3％、6％、9％、12％、15％）和不同粒度（3～2、2～1、≤1 mm）的烧结板状刚玉对试样性能的影响，并分析其物相组成和显微结构。结果表明：当烧结板状刚玉细粉加入量为6％（w）时，试样的显气孔率16％，体积密度2．99 g·cm－3，常温耐压强度80．9 MPa，荷重软化温度1609℃，抗热震性达到20次，综合性能最好；改变加入刚玉的粒度，可以控制刚玉反应速度，同时影响高铁镁砂中Fe的扩散；铁在方镁石中固溶度大，高铁镁砂的引入可以起到方镁石改性的作用；由于铁氧化物的存在，高铁镁砂－刚玉体系在高温下易于促进镁铝尖晶石和铁铝尖晶石固溶体的形成。
Specimens were prepared using iron-rich magnesia (3-1,≤1,and ≤0.088 mm)and high purity magnesia (≤0.088 mm)as the main starting materials.The effects of particle size (3 -2,2 -1,and≤1 mm)and addition (3%,6%,9%,12%,and 15%,in mass,the same hereinafter)of sintered tabular co-rundum on specimen properties were studied.The phase composition and microstructure of the specimens were analyzed.The results show that specimen with 6% corundum possesses the best performance:ap-parent porosity 16%,bulk density 2.99 g·cm -3,cold crushing strength 80.9 MPa,refractoriness under load 1 609 ℃,thermal shock resistance 20 cycles;adjusting particle size of corundum can control the reac-tion speed and influence the diffusion of Fe in iron-rich magnesia;Fe has a large solid solution in periclase thus iron-rich magnesia can modify periclase;the formations of magnesium aluminate spinel and hercynite solid solution are accelerated at high temperatures in the iron-rich magnesia-corundum system at the pres-ence of i ron oxi des.
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