发泡法制备多孔氧化铝陶瓷

发布时间：2018-05-23 13:56

本文选题：多孔氧化铝 + 蛋白质　；参考：《郑州大学》2011年硕士论文

【摘要】：多孔氧化铝陶瓷可以作为催化剂载体,过滤材料,高温耐火材料等用途,而制造氧化铝多孔陶瓷的方法有很多,本文采用蛋白质发泡法,蛋白质一种很好的发泡剂和凝结剂,也是一种很好的绿色环保发泡剂。本实验用氧化铝为骨料,加入发泡剂和水进行球磨成所需料浆。用正交分析研究发泡剂含量、球磨速度和球磨时间这三个参数对制备材料性能影响,寻找最佳工艺参数。通过改变料浆中氧化铝的固含量,制备出不同密度的氧化铝多孔陶瓷,并观察固含量对微观结构和性能的影响。同时还研究用氢氧化铝代替部分氧化铝对材料性能影响。通过TG—DSC分析蛋白质和氢氧化铝的分解行为,确定最佳烧成制度；通过场发射扫描电子显微镜对烧结样品显微结构进行分析；通过高温试验机测定材料的抗压强度。通过正交实验研究发泡剂含量、搅拌时间、搅拌速率对材料气孔率的影响,最终确定发泡剂含量为25%(以料浆中液体重量为基准),搅拌时间为3h,搅拌速率为160转／分钟时制备出的多孔氧化铝气孔率最好。通过改变料浆中氧化铝的固含量可以制备出气孔率由20%-65%的多孔氧化铝陶瓷,这些不同气孔率的多孔氧化铝陶瓷可以用于不用领域。通过对固含量为40%的料浆中用氢氧化铝代替部分氧化铝(以体积比为准)研究制备多孔氧化铝的性能,最终用20%的氢氧化铝代替氧化铝不但可以提高材料的气孔率还可以有效提高材料的抗压强度。通过研究纳米粉体制备出的多孔氧化铝材料的性能,得到用固含量为10%的纳米氧化铝可以制备出气孔分布均匀且具有大量闭气孔的多孔氧化铝材料,但是其强度只有1MPa左右,这种材料可以用作高温隔热耐火材料。
[Abstract]:Porous alumina ceramics can be used as catalyst carrier, filter material, high temperature refractory and so on, but there are many methods to make alumina porous ceramics. In this paper, protein foaming method is used, protein is a good foaming agent and coagulant. It is also a good green foaming agent. In this experiment, alumina was used as aggregate, foaming agent and water were added into slurry. The effects of foaming agent content, milling speed and milling time on the properties of the prepared materials were studied by orthogonal analysis. Alumina porous ceramics with different densities were prepared by changing the solid content of alumina in slurry, and the effect of solid content on microstructure and properties was observed. At the same time, the effect of aluminum hydroxide replacing part of alumina on the properties of the material is also studied. The decomposition behavior of protein and aluminum hydroxide was analyzed by TG-DSC to determine the best sintering system. The microstructure of sintered samples was analyzed by field emission scanning electron microscope (SEM). The compressive strength of the sintered samples was measured by high temperature testing machine. The effects of foaming agent content, stirring time and stirring rate on the porosity of the materials were studied by orthogonal experiment. Finally, it was determined that the porosity of porous alumina was the best when the content of foaming agent was 25 and the mass of liquid in the slurry was taken as the benchmark, the stirring time was 3 h and the stirring rate was 160 r / min. The porous alumina ceramics with porosity ranging from 20% to 65% can be prepared by changing the solid content of alumina in the slurry. These porous alumina ceramics with different porosity can be used in the field of non-use. The properties of porous alumina were studied by replacing part of alumina with aluminum hydroxide in the slurry with 40% solid content (whichever is the volume ratio). Finally, using 20% aluminum hydroxide instead of alumina can not only improve the porosity of the material, but also improve the compressive strength of the material. By studying the properties of porous alumina prepared by nano-powder, the porous alumina material with 10% solid content can be prepared with uniform pore distribution and a large number of closed pores, but its strength is only about 1MPa. This material can be used as a high-temperature insulating refractory.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TQ174.1

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