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What is Aluminum oxide and its application

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Author : NANOTRUN
Update time : 2021-09-08 14:49:02
What is Aluminum oxide
Aluminum oxide is an inorganic substance with the chemical formula Al2O3. It is a high-hardness compound with a melting point of 2054°C and a boiling point of 2980°C. It is an ionic crystal that can be ionized at high temperatures and is often used in the manufacture of refractory materials.
Aluminum oxide is a white solid hardly soluble in water, odorless, tasteless, and extremely hard in nature. It is easy to absorb moisture but does not deliquescence (after burning, it does not absorb moisture). Aluminum oxide is a typical amphoteric oxide (corundum is alpha-shaped and belongs to the hexagonal densest packing, is an inert compound, slightly soluble in acid and alkali, corrosion resistance), soluble in inorganic acids and alkaline solutions, almost insoluble in water and non-polar Organic solvent; relative density (d204) 4.0; melting point 2050℃.
Application of Nano Aluminum oxide
Lithium battery separator coating material:
High-purity Nano-Aluminum oxide is used as a ceramic coating to be applied to the positive and negative electrode separators of lithium batteries, which play a role in heat resistance, high-temperature resistance, and insulation, which can prevent the power battery from being overheated due to high temperature. Melted and short-circuited.
Lithium battery cathode material additives:
High-purity Nano-Aluminum oxide doped with lithium cobalt oxide, lithium manganate, etc. can improve thermal stability, improve cycle performance and overcharge resistance, inhibit oxygen generation and LiPF6 decomposition, and avoid direct contact between LiCo02 and electrolyte. Reduce the electrochemical specific capacity loss, thereby increasing the electrochemical specific capacity of LiCoO2.
Catalyst carrier:
High-purity γ-type Nano-Aluminum oxide is a porous material, with an internal surface area of ​​up to hundreds of square meters per gram, high activity, and strong adsorption capacity. It is a commonly used adsorbent, catalyst, and catalyst carrier in the petroleum refining and petrochemical industry; it is a deacidification agent for transformer oil and turbine oil in the industry; it is also used for chromatographic analysis; it is a neutral strong desiccant in the laboratory. Its drying capacity is no less than that of phosphorus pentoxide. After use, it can be regenerated and reused after heating at 175°C for 6-8h.

Anti-caking of powder coating:
Nano aluminum oxide is used in powder coatings, which can increase the bulkiness of powder coatings and has a good anti-caking effect. In summer, Nano-Aluminum oxide can effectively prevent powder coating from agglomerating and has good storage properties for powder coatings used in high temperature and high humidity environments.
Wear-resistant hardener for coatings, rubber, and plastics:
Adding 5-20% of Nano-Aluminum oxide, the prepared coating can greatly improve the wear resistance and scratch-resistance of the coating, which is 2 to 5 times higher than the wear resistance of traditional coatings. After adding Nano-Aluminum oxide in the paint, a very fine, uniform, and very hard network structure can be formed on the surface of the paint to protect the polymer paint layer below from damage. The anti-scratch performance of the Nano paint is better than the original The paint has been increased by 3 times and is widely used in automobile paints. Adding Nano aluminum oxide can significantly increase the hardness of the coating, and adding about 20% can reach 6-7H. Does not affect the transparency of the coating.
Thermal conductivity of plastics, rubbers, adhesives, and coatings:
Aluminum oxide single crystal has a thermal conductivity of 30, Nano-scale Aluminum oxide has high thermal conductivity and a large amount of spherical filling. In order to improve the compatibility of the resin matrix and the filler, and improve the thermal conductivity of the matrix material without reducing its mechanical properties, surface treatment agents such as coupling agents are commonly used for surface treatment, and the thermal conductivity is significantly improved.
Ceramics:
Nano Aluminum oxide has high purity, uniform particle size, and good dispersibility. Adding about 10% of VK-L30 to sintered ceramics can increase the molding pressure and reduce the number of pores, thereby increasing the density of the ceramic green body, improving the density and mechanical properties of Aluminum oxide ceramics after sintering, and reducing the sintering temperature more effectively.
Powder metallurgy:
Nano Aluminum oxide for metallurgy, with small particle size, large specific surface area, high activity, adding 1-3% Nano Aluminum oxide to prevent densification of the matrix and enlargement of crystal grains, enhanced hardness, enhanced conductivity, and mechanical properties, and increased melting point And high-temperature resistance.
Polishing:
Aluminum oxide has uniform particles and a high spherical shape. It is a precision polishing powder and a good material for metallographic polishing. It is also suitable for stainless steel mirror polishing, titanium polishing, cast iron polishing, aluminum mirror polishing, stone mirror polishing, paint Polishing, resin polishing, PCB circuit board polishing, glass polishing, optical glass, spectacle lens polishing, resin lens polishing, sapphire polishing, LED polishing, germanium polishing, zinc polishing, fast polishing, good brightness, no scratches.
 
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