纳米氧化镁制备新方法、新形态构造及形成过程的研究

发布时间：2018-05-28 11:23

本文选题：氮气保护加压法 + 纳米氧化镁　；参考：《天津大学》2015年博士论文

【摘要】：纳米氧化镁是一种具有特殊性能的无机功能材料,应用十分广泛。目前,纳米氧化镁的制备方法有很多,但都不够完善,并且很难应用到大规模生产当中。在这种情况下,本文提出了一种纳米氧化镁制备新方法:氮气保护加压法,并且采用该新方法制备了一系列不同形貌的纳米氧化镁产品,也对这种新方法的工艺条件及放大实验进行了深入研究,对该方法所制备出的纳米氧化镁产品特性进行了全面测试。此外,本文也研究了定向引导制备特定形貌纳米氧化镁的形成过程,推测了不同形貌纳米氧化镁产品的微观构型。本文采用氮气保护加压法成功制备出分散性好、平均粒径较小、粒径分布窄的纳米氧化镁产品,确定了这种新方法制备纳米氧化镁的最佳工艺条件。在分析测试的基础上,确定该产品属于立方晶系,并对其微观构型进行了推断。同时,也研究了本方法工艺参数改变对制备纳米氧化镁产品及前驱体氢氧化镁特性的影响规律。本文研究了氮气保护加压法在制备纳米氧化镁方面的特点,将新方法与常压法制备纳米氧化镁的前驱体、产品的特性进行了全面对比。研究表明,采用氮气保护加压法所制得的前驱体及产品特性,均优于常压法所得的前驱体及产品特性。此外,也对该方法进行了放大实验,研究结果表明氮气保护加压法在制备前驱体及产品纯度与收率方面,各项指标也均优于常压法。同时,实验研究结果表明,这种新方法在制备纳米氧化镁方面具有可靠性、可重复性工业化应用性。本文研究了定向引导促使特定形貌的纳米氧化镁形成过程。对于颗粒类纳米氧化镁产品,在研究了氮气保护加压法的工艺参数对纳米氧化镁影响基础上,定向引导片状及叠片状纳米氧化镁产品生成,揭示了添加剂加入量及煅烧时间对该类形貌的纳米氧化镁的形成过程影响。对于薄膜类纳米氧化镁产品,研究了氧化镁纳米膜在铝合金衬底上的形成过程及形貌变化,深入研究了氧化镁纳米膜由颗粒覆盖状态到形成致密薄膜的过程。同时,在分析测试基础上,该氧化镁纳米膜的微观构型进行了推测。
[Abstract]:Nanometer magnesium oxide is a kind of inorganic functional material with special properties, which is widely used. At present, there are a lot of preparation methods of nanometer magnesium oxide, but all of them are not perfect, and it is difficult to be used in mass production. In this case, a new method of preparation of nanometer magnesium oxide, nitrous gas protected pressure method, was proposed, and a series of nanometer magnesium oxide products with different morphologies were prepared by this new method. The process conditions and amplification experiments of the new method were also studied, and the properties of nano-MgO products prepared by the method were tested. In addition, the formation process of nanocrystalline magnesium oxide with specific morphology was also studied, and the microstructure of nano-MgO products with different morphologies was speculated. In this paper, nanocrystalline magnesium oxide products with good dispersion, small average particle size and narrow particle size distribution were successfully prepared by nitrogen protection pressurization method. The optimum technological conditions for the preparation of nanometer magnesium oxide by this new method were determined. On the basis of analysis and test, it is determined that the product belongs to cubic crystal system, and its microstructure is inferred. At the same time, the influence of the process parameters on the preparation of nano-magnesium oxide and the characteristics of the precursor magnesium hydroxide was also studied. In this paper, the characteristics of nitrogen-protected pressurized method in the preparation of nano-MgO _ 2 were studied. The new method was compared with the precursor of preparing nano-MgO by atmospheric pressure, and the characteristics of the product were compared. The results show that the characteristics of precursors and products prepared by nitrogen-protected pressure method are superior to those obtained by atmospheric pressure method. In addition, the amplification experiments were also carried out. The results showed that nitrogen-protected pressure method was superior to the atmospheric pressure method in the preparation of precursor and the purity and yield of the product. At the same time, the experimental results show that the new method is reliable and reproducible in the preparation of nanometer magnesium oxide. In this paper, the formation process of nano-MgO with specific morphology promoted by directed guidance has been studied. On the basis of studying the effect of the process parameters of nitrogen-protected pressurization method on the nano-MgO products, the production of nano-MgO products in laminated and laminated forms was guided. The effects of additive content and calcination time on the formation process of nano-MgO were revealed. The formation process and morphology of magnesium oxide nanocrystalline films on aluminum alloy substrates were studied, and the process from particle covering state to dense film formation was studied. At the same time, on the basis of analysis and test, the microstructure of the film was speculated.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TQ132.2;TB383.1

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