Aluminium oxide (a white solid) is composed of aluminum and oxygen. Its molecular formula is Al2O3. The mineral is commonly known by the name bauxite. It can also be used in ceramics and materials 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 spheres are used to make ceramic materials, catalysts, carriers, chemical mechanical polishing agents, and other catalyst applications due to their size and morphology. The broad definition of alumina includes two categories: anhydrous or aqueous.
Aqueous allumina
H2O is another name for hydrated Alumina. There are six varieties of aluminahydrate. 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 types of 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 transition state alumina, is also available.
Alumina crystals have different chemical and physically properties. For example, density, pores structure, specific area, thermal stability, etc. There are many ways to prepare alumina, even for the same crystal, and their properties will be very different.
It is part of amorphous aluminum, also called -, and –Al2O3; it’s the product rapid dehydration as well as quenching of precursors. 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 absorbing agent. This ingredient is used widely in many other fields.
– Al2O3 : Dehydrated precursor at low temperature has a relatively large surface area. However, it has low thermal stability and is susceptible for crystal transformation at high temperatures.
Active alumina: -Al2O3 has strong catalytic and adsorption capacities and is known as activated Al2O3. 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 (precursor): Dehydrated product at 600 °C. Although it is nearly free from structural water, its specific surface and pore area are usually small. But, their thermal stability makes them suitable for high temperatures.
-Al2O3 also called corundum. This is the end thermostable crystalline state after dehydration. It is the most used type of allumina crystal and is totally free of any water. Its structure is very compact. Because of its small surface area it melts at 2050 ° C. This crystal also has high hardness and strength. It is frequently used as abrasive, heat resistant and ceramic composite material.
Crystalline Transformation of Alumina
Calcined aqueous aluminium at different temperatures. While water is removed continuously, the location of aluminum atoms, oxygen atoms, and other elements is changing constantly. Slowly, unstable transitions occur in alumina. At temperatures above 1200° C, a phase of lattice remodelling occurs. This is when the oxygen-atom arrangement converts to a hexagonal, tightly packed structure.
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