TiO_2加入量对MgO-TiO_2熟料性能和显微结构的影响  

Effects of TiO_2 additions on properties and microstructure of MgO- TiO_2 clinker

作　　者：李云红[1] 魏军从[1] 王义龙 刘治园 涂军波[1] 

机构地区：[1]河北联合大学材料科学与工程学院河北省无机非金属材料重点实验室,河北唐山063009 [2]唐山市国亮特殊耐火材料有限公司,河北唐山063021

出　　处：《耐火材料》2015年第2期124-127,共4页Refractories

基　　金：唐山市科技计划项目(14110207A)

摘　　要：以w(MgO)=96.14%的轻烧氧化镁和w(TiO2)>99.0%的分析纯TiO2为原料,分别加入质量分数0、5%、10%、15%、20%的TiO2,混合均匀,压制成型为30 mm×5 mm的试样,分别在1 500和1 600℃保温3 h烧结,制备得到MgO-TiO2熟料,并研究了熟料的体积密度、显气孔率、抗水化性能、物相组成和显微结构。结果表明:由于TiO2和MgO间的固溶和尖晶石反应,使得方镁石晶粒逐渐长大,反应过程中生成的Mg2TiO4分布在方镁石晶粒周围,降低了试样的显气孔率,提高了熟料的抗水化性能;TiO2添加量为5%(w)时熟料最致密,继续增加时,由于生成的Mg2TiO4体积膨胀,显气孔率有所增大;随着煅烧温度升高,熟料致密度提高,当温度为1 600℃时,能够获得抗水化性能良好的致密熟料。The specimens with dimensions of φ30 mm × 5 mm were prepared using light-burned magnesia （ w（MgO） = 96.14% ） and analytically pure TiO2 （ w（ TiO2 ） 〉 99.0% ） as raw materials, adding 0,5 %, 10%, 15% ,or 20% （in mass） TiO2,mixing well,and pressing. The MgO-TiO= clinkers were prepared by firing the specimens at 1 500 and 1 600 ℃ for 3 h, respectively. The apparent porosity, bulk density, hydration re- sistance,phase composition and microstructure were researched. The results show that the grain size of periclase increases because of solid solution and spinel reaction between MgO and TiOz. The generated Mg2TiO4 distributes around periclase,decreasing the apparent porosity and improving the hydration resist- ance of the clinkers. The bulk density of the clinker reaches the maximum with 5 mass% TiO2. More TiO2 addition leads to an increase in apparent porosity due to the volume expansion of Mg2TiO4. With the firing temperature rising,the bulk density of the clinker increases. A dense MgO-TiO2 clinker with excellent hy- dration resistance is gained at 1 600 ℃.

关 键 词：MgO—TiO2熟料 Mg2TiO4 物相组成 显微结构 抗水化 

分 类 号：TQ175[化学工程—硅酸盐工业]