莫来石轻质材料的制备与性能研究

发布时间：2018-05-13 00:29

  本文选题：流变性 + 莫来石化　； 参考：《武汉科技大学》2015年硕士论文

【摘要】：采用泡沫法制备的轻质陶瓷材料具有较高的气孔率,材料中的气孔可以有效地阻止热量的散失,起到良好的保温效果。尤其在能源消耗日益增大,能源危机日渐加剧的当今社会,开发导热系数小、保温效果好的轻质隔热材料极为重要。同时轻质材料中大量气孔的存在可以减少材料的使用,达到节约资源的目的。 本文研究了以红柱石为主要原料制备莫来石轻质保温材料的过程。借助流变仪分别测试了固含量、粘土、硅微粉以及水泥对红柱石料浆流变性能的影响。借助X射线衍射仪和扫描电子显微镜研究了红柱石高温莫来石化过程。另外还研究了容重对轻质材料性能的影响。通过对Maxwell导热模型的改进得到了适合于本体系的导热系数方程。 研究结果表明：在料浆的制备过程中,粘土的加入会增大料浆的粘度,但可以改善料浆的稳定性；在固含量较低时(小于40%),硅微粉的加入也会增大料浆的粘度,对料浆的稳定性也能起到一定的改善作用；水泥的加入对料浆的流变性影响不大。 红柱石在1250℃开始莫来石化,1350℃时莫来石化过程速度较快,1400℃保温3个小时可使红柱石莫来石化完成。随泡沫加入量的增大,试样的容重减小。随容重的减小,试样真气孔率和显气孔率均增大,闭气孔率基本不变,耐压强度减小,烧后线变化率增大,气孔的平均尺寸增大。最后获得制备不同容重梯度轻质材料的技术。 综合考虑材料的气孔率、气孔形状和气孔尺寸对导热系数的影响得到了适合本体系的导热系数模型：
[Abstract]:The light ceramic material prepared by foam method has high porosity and the porosity in the material can effectively prevent the heat loss and play a good thermal insulation effect. Especially in the society where energy consumption is increasing day by day and energy crisis is getting worse, it is very important to develop light heat insulation materials with small thermal conductivity and good thermal insulation effect. At the same time, the existence of a large number of pores in lightweight materials can reduce the use of materials and achieve the purpose of saving resources. In this paper, the process of preparing mullite light thermal insulation material using andalusite as main raw material is studied. The effects of solid content, clay, silica powder and cement on rheological properties of andalusite slurry were measured by rheometer. The high temperature mullitization process of andalusite was studied by means of X-ray diffractometer and scanning electron microscope. The effect of bulk density on the properties of lightweight materials was also studied. By improving the Maxwell thermal conductivity model, the thermal conductivity equation suitable for the system is obtained. The results show that the viscosity of slurry will be increased by adding clay, but the stability of slurry can be improved by adding clay, and the viscosity of slurry will be increased when the solid content is lower (< 40%). The stability of slurry can be improved to some extent, and the rheology of slurry is not affected by cement addition. When andalusite starts at 1250 鈩，

本文编号：1880862