关键词: 刚玉质耐火材料, 金属铬, 铝铬固溶体, 微观结构, 抗渣侵蚀性能

Abstract: In order to obtain corundum refractories with good thermal shock resistance and long service life,the samples were prepared using white corundum (5-3,3-1,≤1,and ≤0.044 mm) as the main raw material,and chromium (≤0.074 mm) as the additive.Effects of the chromium addition (0,1%,3%,and 5%,by mass) on the physical properties,the thermal shock resistance and the slag corrosion resistance were studied.The results show that:(1)with the chromium addition increasing,the bulk density,the compressive strength and the thermal shock resistance of the samples increase and reach the maximum with 3% chromium addition;(2)the oxidation of chromium at high temperatures produces Cr₂O₃,causing volume expansion,filling partial pores among corundum particles in the sample,and increasing the bulk density;the generated Cr₂O₃ reacts with Al₂O₃ to form alumina chromia solid solution,improving the bonding strength between the matrix and the corundum particles;(3)the addition of chromium can also effectively inhibit the immersion of slag into the refractories and reduce the corrosion depth;when the addition increases from 0 to 3%,the corrosion depth decreases from 6.4 mm to 4.1 mm.

Key words: corundum refractories, chromium, alumina-chromia solid solution, microstructure, slag corrosion resistance