金属铬添加量对刚玉质耐火材料性能的影响  

Effect of chromium addition on properties of corundum refractories

作　　者：李健 于景坤 温天朋 刘朝阳 Li Jian;Yu Jingkun;Wen Tianpeng;Liu Zhaoyang(School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China;不详)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819

出　　处：《耐火材料》2023年第1期55-58,共4页Refractories

基　　金：国家自然科学基金项目(No.51874083,No.51932008)。

摘　　要：为了获得抗热震性好、使用寿命长的刚玉质耐火材料,以粒度为5~3、3~1、≤1、≤0.044 mm的白刚玉为主要原料,金属铬(≤0.074 mm)为添加剂制备刚玉质耐火材料。研究了金属铬添加量(质量分数分别为0、1%、3%和5%)对刚玉质耐火材料物理性能、抗热震性以及抗渣侵蚀性能的影响。结果表明:1)随着金属铬加入量的增加,试样的体积密度、耐压强度及抗热震性能增加,当金属铬加入量(w)为3%时达到最大值。2)金属铬在高温下氧化生成Cr_(2)O_(3)产生体积膨胀,填充了试样中刚玉颗粒间的部分气孔,提高了试样的体积密度;生成的Cr_(2)O_(3)与Al_(2)O_(3)发生固溶反应形成铝铬固溶体,提高了基质与刚玉颗粒间的结合强度。3)加入金属铬还可以有效抑制熔渣向耐火材料内部的侵入,有效减少熔渣侵蚀深度。当加入量由0增加至3%(w)时,侵蚀深度由6.4 mm减小至4.1 mm。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 Cr_(2)O_(3),causing volume expansion,filling partial pores among corundum particles in the sample,and increasing the bulk density;the generated Cr_(2)O_(3)reacts with Al_(2)O_(3)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.

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 

分 类 号：TQ175[化学工程—硅酸盐工业]