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 ion crystal that can be ionized at high temperatures and is often used to make refractory materials.
1. Alumina powder is often used as a medium for chromatographic analysis.
2. Make tempered glass: it can be used to make diamonds in mechanical bearings or clocks.
3. Alumina is also used as high-temperature refractory material to make refractory bricks, crucibles, porcelain, artificial gemstones, etc. Alumina is also a raw material for aluminum smelting.
4. Bauxite
1), α-type alumina
In the lattice of α-type alumina, oxygen ions are hexagonally closely packed, and Al3+ is symmetrically distributed in the octahedral coordination center surrounded by oxygen ions. The lattice energy is very large, so the melting point and boiling point are very high. Alpha-type alumina is insoluble in water and acid. It is also called aluminum oxide in industry. It is the basic raw material for making metallic aluminum. It is also used to make various refractory bricks, refractory crucibles, refractory tubes, and high-temperature resistant experimental instruments. It can also be used as an abrasive. , flame retardants, fillers, etc.; high-purity α-type alumina is also a raw material for the production of artificial corundum, artificial ruby and sapphire; it is also used to produce the substrate of modern large-scale integrated circuits.
2), γ-type alumina
γ-type alumina is produced by dehydrating aluminum hydroxide in a low temperature environment of 140-150°C. It is also called activated alumina and aluminum glue in industry. In its structure, oxygen ions are approximately closely packed at the center of the cube, and Al3+ is irregularly distributed in the octahedral and tetrahedral gaps surrounded by oxygen ions. γ-type alumina is insoluble in water and soluble in strong acid or alkali solutions. When it is heated to 1200°C, it is completely converted into α-type alumina. γ-type alumina is a porous material with an internal surface area of hundreds of square meters per gram and high activity and strong adsorption capacity. Industrial products are often colorless or slightly pink cylindrical particles with good pressure resistance. It is a commonly used adsorbent, catalyst and catalyst carrier in petroleum refining and petrochemical industry; in industry, it is a deacidifier for transformer oil and turbine oil, and is also used in chromatographic analysis; in the laboratory, it is a neutral and strong desiccant , its drying ability is no less than that of phosphorus pentoxide, and it can be regenerated and reused if heated below 175°C for 6-8 hours after use.
5. Electrolytic alumina
1), β-type alumina
It has ionic conductivity (allows Na to pass), and uses β-alumina as the electrolyte to make a sodium-sulfur battery. Because this kind of battery has a large storage capacity per unit weight and can discharge large currents, it has broad application prospects. The negative electrode of this battery is molten sodium, the positive electrode is sodium polysulfide (Na2Sx), and the electrolyte is β-alumina (sodium ion conductor)
6. Abrasive alumina
Aluminum oxide is suitable for a variety of wet and dry processing processes and can polish the rough surface of any workpiece into fine details. It is one of the most economical and affordable abrasives. This sharp and angular synthetic abrasive has a hardness second only to diamond and is especially suitable for use when there are strict requirements for iron contamination. Used for the roughest cutting, it can also be made into a pebble shape to process workpieces with precise dimensions to achieve extremely low roughness. It is one of the fastest cutting abrasives due to its high-density, sharp, diamond-shaped structure.
7. Alumina is used to produce brown corundum by electro-melting high-quality bauxite ore, while high-quality aluminate is used to produce pink corundum and white corundum. Their natural crystal structure gives them high hardness and fast cutting performance. At the same time, they are often used as raw materials for bonded abrasives and coated abrasives.
8. Alumina can be recycled multiple times. The number of cycles is related to the material grade and specific process. Most standard abrasive sandblasting equipment can be used.
9. Applicable industrial scope: aerospace industry, automotive industry, consumer goods processing, casting/die-casting, OEM distributors, semiconductor industry and other different fields.
10. Applicable process scope: pretreatment before surface plating, painting, glazing and coating with PTFE; deburring and pot scale removal for aluminum and alloy products; mold cleaning; pretreatment before metal sandblasting; dry grinding and wet grinding Grinding; precision optical refraction; grinding of minerals, metals, glasses and crystals; glass engraving and paint additives.
11. Ceramic function
Alumina is divided into calcined alumina and ordinary industrial alumina. Calcined alumina is an essential raw material for the production of antique bricks, while industrial alumina can be used to produce microcrystalline stones. In traditional glazes, alumina is often used for whitening. As antique bricks and microcrystalline stones are favored by the market, the consumption of alumina is also increasing year by year. Therefore, alumina ceramics emerged in the ceramic industry - alumina ceramics are a ceramic material with Al2O3 as the main raw material and corundum as the main crystal phase. Because of its high mechanical strength, high hardness, high-frequency dielectric It has the advantages of low loss, high high temperature insulation resistance, chemical corrosion resistance and good thermal conductivity and other excellent comprehensive technical properties.
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