添加物对镁钙材料抗水化性能的影响

发布时间：2017-12-28 03:03

本文关键词：添加物对镁钙材料抗水化性能的影响　出处：《耐火材料》2016年03期 　论文类型：期刊论文

【摘要】：为了提高烧结镁钙材料的抗水化性,在轻烧白云石粉中分别单一添加α-Al_2O_3粉(质量分数分别为10%、20%、30%、40%、50%)或Fe_2O_3粉(质量分数分别为2%、4%、6%、8%)以及复合添加Fe_2O_3粉+α-Al_2O_3粉(质量分数分别为10%+8%、10%+2%)或Fe_2O_3粉+α-Al_2O_3粉+ZrO_2粉(质量分数分别为1.2%+12%+5%、1.2%+12%+10%),研究了单一和复合添加α-Al_2O_3、Fe_2O_3和Zr O2对不同温度(1 350~1 600℃)保温2 h烧后试样抗水化性能的影响。结果表明:单一添加Fe_2O_3时,随着Fe_2O_3含量的增加,水化质量增加率显著减小,温度的影响并不明显。单一添加α-Al_2O_3时,随着α-Al_2O_3含量的增加,水化质量增加率呈下降的趋势,升高温度,水化质量增加率逐渐下降。复合添加Fe_2O_3+α-Al_2O_3以及Fe_2O_3+α-Al_2O_3+ZrO_2时,生成的化合物和固溶体一方面减少了游离CaO的数量,另一方面加速了烧结致密化过程,阻碍了水蒸气向颗粒内部的扩散,能更有效地提高镁钙材料的抗水化性能,因此对白云石的抗水化性能优于单一添加物的。
[Abstract]:In order to improve the hydration resistance of MgO Cao material in sintering, light burned dolomite powder were added single alpha -Al_2O_3 powder (mass fraction of 10%, 20%, 30%, 40%, 50% respectively) or Fe_2O_3 powder (mass fraction of 2%, 4%, 6%, 8% respectively) and compound with Fe_2O_3 powder + alpha -Al_2O_3 powder (mass fraction of 10%+8% and 10%+2% respectively) or Fe_2O_3 powder + alpha -Al_2O_3 powder +ZrO_2 powder (mass fraction of 1.2%+12%+5% and 1.2%+12%+10%, respectively) of single and compound -Al_2O_3, Fe_2O_3 and Zr add a O2 to the different temperature (1 600 C 350~1) holding 2 h hydration resistance of samples after burning effect. The results show that with the addition of Fe_2O_3, with the increase of Fe_2O_3 content, the increase of hydration quality decreases significantly, and the effect of temperature is not obvious. When a single addition of alpha -Al_2O_3, with the increase of the content of alpha -Al_2O_3, the increase of hydration quality tends to decrease, the increase of temperature and the increase of hydration quality gradually decrease. Add Fe_2O_3+ and Fe_2O_3+ composite alpha -Al_2O_3 alpha -Al_2O_3+ZrO_2, generating compounds and solid solution on the one hand, reduce the number of free CaO, on the other hand, accelerate the Sintering Densification Process, hindering the spread of water vapor to the internal particle, can more effectively improve the hydration resistance of MgO Cao material, so on dolomite hydration resistance is better than that of single additives.
【作者单位】：郑州大学物理工程学院材料物理教育部重点实验室;
【分类号】：TQ175.1
【正文快照】： 冶金技术的发展对耐火材料质量和性能提出了更高的要求。镁钙系耐火材料具有耐火度高,抗碱性渣性能强,高温力学稳定性高,不污染钢水[1-3],并且还能捕捉钢液中的S、P、Al2O3等非金属杂质从而净化钢液,因此被广泛应用于炼钢转炉、电炉、精炼炉以及连铸中间包,特别是在冶炼特种钢

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