Aluminium oxide is a white, solid compound made of aluminum, oxygen, and has a molecular form of Al2O3. The mineral is commonly known by the name bauxite. It can also be used in ceramics and material science.
Spherical aluminum is an important material in chemical chemistry. This has many excellent characteristics, such as its high hardness. high strength. high corrosion resistance. Alumina spherical is used in many areas, including ceramic materials, chemically mechanical polishing agents, catalysts and carriers, due to its size. The broad definition of alumina includes two categories: anhydrous or aqueous.
Aqueous allumina
H2O is another name for hydrated Alumina. Six types of alumina have been identified. Alumina trihydrate, including industrial aluminum hydroxide (α-Al2O3·H2O), mayalite (β1-Al2O3·H2O) and boraxite (β2-Al2O3·H2O): alumina monohydrate, including boehmite (α) -Al2O3·H2O), diaspore (β-Al2O3·H2O): pseudo-boehmite (Al2O3·1.3-2.2H2O).
Anhydrous allumina
Presently, there are eight possible crystal forms for alumina. There are at least eight different crystal forms of alumina. -Al2O3 has a stable thermal phase, which can be treated with high temperatures. The other, unstable transitional alumina, is also available.
Alumina crystals have different chemical and physically properties. For example, density, pores structure, specific area, thermal stability, and other such things. Even though they are the same crystal, their properties will be greatly affected by how the alumina was prepared.
It is also known as -, or Al2O3. This product comes from the rapid quenching of precursors and dehydration. It is more commonly called “quick-pulse” or FCA (Flash Calcined Alumina). It exhibits strong water absorption and hydration activity. This makes it a good binder as well as an effective water absorber. It is used widely in many other fields.
-Al2O3 is the product of the precursor that was dehydrated at a low temp. This has a larger specific area than its counterparts at high temperature, and it can crystalize at high temperatures.
Activated alumina is Al2O3. It exhibits strong adsorption capability and catalytic activity. You can use it in many applications because the specific surface is high, bulk density low, special pores are obtained and thermal stability and mechanical toughness excellent.
-.-.- Al2O3 The precursor is dried at temperatures higher than 600 °C. While it almost does not contain structural water, the specific surface area, pore volume, and thermal stability are better. This catalytic carrier can then be used to initiate the reaction.
-Al2O3 (also known as corundum) is the ultimate thermostable crystalline state after dehydration. It is the most used type of allumina crystal and is totally free of any water. It has a compact structure with a very limited surface area. Also, it can melt at as high as 2050° C. This crystal also features high hardness, strength, wear resistance, and corrosion resistance. It is frequently used as an abrasive, heat resistant and ceramic composite material.
Crystalline Transformation of Alumina
Calcined aqueous aluminium at various temperatures. While water is removed continuously from the structure, the location of aluminum atoms, oxygen atoms, and other elements is always changing. As a result, alumina forms an assortment of unstable transitions. At temperatures above 1200 ° C, there is a transition to lattice remodelling phase. In which the oxygen atom arrangement changes into a tightly packed hexagonal structure.
TRUNNANO (Luoyang Trunnano Tech Co. Ltd. ), a manufacturer of aluminium oxide, has more than 12 years in chemical products development and research. If you’re looking for Aluminium oxide of high quality, feel free to contact us.
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