高炉渣微晶玻璃体系中的析晶行为

Crystallization behavior of blast furnace slag glass ceramics

本文以CaO、MgO、Al_2O_3和SiO_2四种氧化物为主要原料,辅以Cr_2O_3、CaF_2和Fe_2O_3为复合晶核剂,B_2O_3为助熔剂,通过高温熔融工艺制备微晶玻璃.系统地研究了四种主要原料的配比对微晶玻璃析晶行为、微观结构、晶相组成及理化性能的影响.通过DTA对基础玻璃的析晶动力学进行分析;通过SEM和XRD对微晶玻璃的微观结构和晶相组成进行分析;通过测定抗折强度、密度及抗酸碱性腐蚀对微晶玻璃的理化性能进行评价.本文创新性地以晶体平均生长指数作为正交试验的研究指标,研究表明:最优的原料配比质量分数为CaO:32%,MgO:13%,Al_2O_3:8%,SiO_2:47%,按此比例混合原料制得的试样经XRD分析得知其结晶相为单一的铝透辉石,衍射峰相比较于其他试样较强,结晶度较高;以此配比制得微晶玻璃制品其晶体平均生长指数高达2.91;最优配比制得的试样抗折强度为147.4MPa,体积密度为3.03g/cm^3,耐酸碱性腐蚀的质量损失率分别为0.37%和0.047%,各项理化性能在各组试样的比较中均处于最优水平.

Four oxides:CaO,MgO,Al 2O 3 and SiO 2 were taken as the main raw materials,Cr 2O 3,CaF 2 and Fe 2O 3 were used as a composite nucleating agent,B 2O 3 was put as a flux.A glass ceramics was prepared by a high temperature melting process.Effects of proportions in the four main raw materials on the crystallization behavior,microstructure,crystal phase composition and physical and chemical properties of the glass ceramics were systematically investigated.The crystallization kinetics of the basic glass was analyzed by DTA;The microstructure and the crystal phase of the glass ceramics were studied by SEM and XRD.Physical and chemical properties of the glass ceramics were determined.As a new idea the author’s look the crystal average growth index as a research target.The orthogonal experimental results showed that the optimal ratio of the raw materials are CaO:32%,MgO:13%,Al 2O 3:8%,SiO 2:47%.Flexural strength is 147.4 MPa,volume density is 3.03 g/cm 3,mass loss after acid and alkaline corrosion were 0.37%and 0.047%,for the sample prepared under the optimal condition.All properties are in the excellent level.