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Progress in preparation and application of nano-aluminium oxide

2018-12-14
On the basis of nanomaterials, nano aluminium oxide(Al2O3) can be prepared. Compared with traditional metal aluminum, its high temperature resistance and hardness are significantly improved. At present, nano Al2O3 is widely used in various fields of social development. In order to better promote industrial production and social development, relevant technical personnel should continue to strengthen exploration, so that nano Al2O3 can have a broader application prospect.

Study on the preparation method of  nano Al2O3
(1) Gas phase method. The gas phase method is one of the main preparation methods of nano-Al2O3, and its refinement is a variety of specific preparation methods.
The main technical principle of laser-induced vapor deposition is to produce high-temperature environment by laser, so that the related nano-materials react chemically in a very short time to produce embryos that are invisible to the naked eye. This kind of embryo can grow rapidly under the high temperature environment of laser. If the temperature away from the irradiation zone will decrease rapidly and stop growing, the volume is generally controlled in the state of the particulate powder for collection, and corresponding subsequent treatment is carried out.
The chemical vapor deposition method is to grasp the law of the critical reaction temperature of aluminum chloride, and artificially manufacture a saturated vapor pressure that enables aluminum chloride to react, so that under such conditions, structural recrystallization can be performed to form a large number of crystals. The core is cured under certain conditions and the technician can collect it through the corresponding collection vessel for later use.

(2) Liquid phase method. This is the most common method for preparing nano-Al2O3, which is also called wet chemical method. On this basis, it is also subdivided into various preparation methods. The traditional precipitation method for preparing nano-Al2O3 is prone to the problem of automatic aggregation of decomposition materials. The preparation of nano-Al2O3 by activated carbon reactor method effectively optimizes this problem.
The high development of modern science and technology provides a diversified preparation method for nano-Al2O3 materials. On the basis of the above methods, the liquid phase method is also refined into reverse microemulsion method, hydrothermal synthesis method, phase transfer separation method, and electricity. A variety of preparation methods, such as chemical methods, can be effectively applied in different preparation environments.

(3) Solid phase method. The solid phase method is divided into two categories: mechanical grinding method and chemical pyrolysis method. The former is directly grinding and pulverizing kaolin containing nano Al2O3 material through relevant mechanical equipment. After pulverizing to a certain extent, the relevant process is carried out. The impurities are separated, and finally powdered nano-Al2O3 is obtained. However, the nano-Al2O3 powder particles prepared by the mechanical grinding method are difficult to maintain a uniform state, and the production noise is relatively large, which is liable to cause damage to the body of a long-term operation. The chemical pyrolysis method is obtained by chemically purifying aluminum sulfate. After repeated iterations, nano-Al2O3 can be obtained. This preparation method has a certain pollution property and generates chemical gases such as sulfur dioxide, which may cause pollution to the atmosphere.
 
Application of nanometer Al2O3
(1) Catalyst carrier application. The Al2O3 support refers to a white powder or shaped Al2O3 solid, which is one of the most widely used catalyst supports, accounting for approximately 70% of the industrially supported catalyst. As a catalyst carrier, Al2O3 has a high specific surface area, good hardness, wear resistance and chemical stability. It can disperse some active components in its surface and pores. It has been widely used in petroleum processing, catalytic cracking, and isobutylene. The preparation of nano-porous Al2O3 support was carried out by super-enriched sol-gel self-assembly method. The nanoporous Al2O3 catalytic support was prepared by thermal spray aluminum coating oxidized anode method.

(2) Ceramic material production. Al2O3 ceramics have good comprehensive properties in mechanics, high temperature resistance and chemical stability. It is one of the most widely used ceramic materials in the world. Nano Al2O3 can improve the strength, toughness and superplasticity of materials and make materials. The performance has been greatly improved. Cahn, a famous British material expert, pointed out that nano-ceramics is a strategic way to solve the brittleness of ceramics. Nano Al2O3 ceramics have the advantages of low sintering temperature, high strength and toughness, and have attracted widespread attention.

(3) Surface protection applications for various materials. Due to its high hardness, nano-Al2O3 materials play an important role in the surface protection of materials. They can be attached to the surface of various materials to form a protective coating to effectively protect the materials. For example, some researchers have found that attaching nano-Al2O3 to the surface of austenitic 304 stainless steel material can effectively improve its hardness.

(4) Fabrication and application of composite materials. Through the exploration of the high temperature resistance of nano-Al2O3 materials, it is found that it can play a great role in the fabrication of composite materials. Some scholars have found in the research that the nano-Al2O3 composite film can be made by nano-Al2O3 material, and its high-temperature electrical properties, decomposition humidity and tensile strength are effectively optimized. Foreign scholars have found that nano-alloys filled with unsaturated Al2O3 nano-composites have excellent tensile strength and impact strength.

(5) Making an adsorbent. In the traditional chemical experiment process, graphite is usually used as adsorbent, although the adsorption effect is more significant, but the decomposition process is more complicated. Chinese scholars have found that nano-Al2O3 has strong adsorption performance, and the adsorption effect on some precious metals can be More than 95% of the discovery, this discovery effectively reduced the loss of precious metals in chemical experiments, and played an important role in safeguarding the economic efficiency of research units.

(6) Application of the sensor. In the research process, foreign researchers have found that the sensor made of nano-Al2O3 film material can effectively detect the release of nitric oxide in rats, and can strengthen the detection of nitric oxide in industrial production in practice.