摘要
以粒度分别为3～1、≤1和≤0．088mm的电熔镁砂为主要原料，在颗粒与细粉质量比固定为67．5：32．5的条件下，分别加入3％（w）的OL—Al2O3粉、Cr2O3粉、钛白粉、脱硅锆粉、铁磷粉等添加剂，在高温隧道窑中于1760℃ 110min烧成后，研究添加剂种类对镁质材料蠕变性能的影响；然后，选择抗蠕变性能较好的添加剂OC—Al2O3和Cr2O3，研究分别单独添加α-Al2O3粉（其质量分数分别为0、2．5％、5％、7．5％和10％）和复合添加α-Al2O3粉与Cr2O3粉（在α-Al2O3粉质量分数为5％的基础上，再分别添加1％、3％和5％的Cr2O3粉）对镁质材料抗蠕变性能的影响。结果表明：（1）添加α-Al2O3粉、Cr2O3粉和铁鳞粉对高炉热风炉用镁质材料的抗蠕变性有利，但添加铁鳞的抗热震性较差，不适合作高炉热风炉用镁质材料的添加剂；添加钛白粉和脱硅锆不利于材料的高温抗蠕变性。（2）在添加5％的α-Al2O3粉基础上复合添加Cr2O3粉时，其质量分数以1％～3％为宜；以5％α-Al2O3＋3％Cr2O3作为镁质材料的复合添加剂，材料的抗蠕变性优于热风炉用低蠕变高铝砖的，其1450℃保温50h的蠕变率仅为低蠕变高铝砖的一半。
The magnesia material for hot blast stove was prepared with fused magnesite （3 - 1, ≤ 1 and ≤0. 088 mm） as main starting material,fixing the mass ratio of particle and powder at 67.5：32.5 ,adding 3 wt% α-Al2O3, Cr2O3,TiO2,desilicated ZrO2 or iron scale, respectively,firing at 1 760 ℃ for 110 min in high temperature tunnel furnace. The effects of additives on the creep resistance of magnesia material were studied. Then additives α-Al2O3 and Cr2O3 which had the better creep resistant effect were selected. The effects of α-Al2O3 addition alone （0,2..5%,5%,7. 5% and 10%） and the additions of both α-Al2O3 and Cr2O3 （α-Al2O3=5%,Cr2O3： 1%,3% and .5%） on the creep resistance were studied. The results showed that. （1）The addition of α-Al2O3 ,Cr2O3 and iron scale enhanced the creep resistance of the material. However, iron scale weakened the thermal shock resistance. The additions of TiO2 and desilicated ZrO2 were not beneficial to enhancing the creep resistance. （2）When fixing the α-Al2O3 addition in 5% ,the appropriate addition of Cr2O3 was 1% -3% ;when adding 5% Al2O3 and 3% Cr2O3,the material had a better creep resistance than the low creep high alumina brick used in hot blast stove,and the creep rate at 1 4.50 ℃ for .50 h of the magnesia material was only half of the low creep high alumina brick.
出处
《耐火材料》
CAS
北大核心
2009年第1期39-41,共3页
Refractories
