Alumina - Materials / Alfa Chemistry

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Alumina

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Catalog Number

ACMA00045025

Product Name

Alumina

Category

Al2O3

Description

Emery is an odorless, white, crystalline powder. Natural aluminum oxide. Very high melting and hard. Used for polishing, grinding, and abrasive operations. An inhalation hazard when present as a dust.;DryPowder, PelletsLargeCrystals;Odorless, white, crystalline powder.

IUPAC Name

oxo(oxoalumanyloxy)alumane

Molecular Weight

101.961g/mol

Molecular Formula

Al2O3

InChI

InChI=1S/2Al.3O

InChI Key

TWNQGVIAIRXVLR-UHFFFAOYSA-N

Melting Point

2045

Purity

0.999

Density

4 g/cm³

Application

Alumina serves a multifaceted purpose in a range of applications due to its unique properties. As a form of aluminum oxide, it is integral for separating inorganic anions and acidic organic molecules, contributing significantly to protein extraction processes. Alumina's role as a grinding and blending agent underscores its importance in manufacturing and material processing. It is also employed as a source of aluminum in chemical reactions and as a catalyst in processes such as the Claus process and the dehydration of alcohols to alkenes. Known for its extraordinary hardness, alumina is widely used as an abrasive material in both natural and synthetic forms, with distinctions in grain size allowing for specific adaptations in abrasive products. Its refractory characteristics make it an ideal choice for furnace linings and high-temperature cement applications. The production of alumina involves transforming bauxite ore through dissolution and heating, resulting in forms that exhibit remarkable resilience and utility in industrial processes. Additionally, its cosmetic variants, like pink and ruby alumina with chromium additives, are utilized in dental and metal-ceramic applications, offering noncontaminating properties crucial for optimal bonding and finishing.

Complexity

34.2

Compound Is Canonicalized

Yes

Covalently-Bonded Unit Count

Defined Atom Stereocenter Count

Defined Bond Stereocenter Count

EC Number

603-397-4;618-619-5

Exact Mass

101.947821g/mol

Formal Charge

Heavy Atom Count

Hydrogen Bond Acceptor Count

Hydrogen Bond Donor Count

Isotope Atom Count

MeSH Entry Terms

Alumina;Alumina Ceramic;Aluminum Oxide;Aluminum Oxide (Al130O40);Aluminum Oxide (Al2O);Aluminum Oxide (AlO2);Bauxite;Ceramic, Alumina;Corundum;Oxide, Aluminum;Sapphire

Monoisotopic Mass

101.947821g/mol

Rotatable Bond Count

RTECS Number

GN0231000

Topological Polar Surface Area

43.4Å²

Undefined Atom Stereocenter Count

Undefined Bond Stereocenter Count

Case Study

High-purity alumina is used as LED substrate material production

XRD patterns of alumina used as sapphire crystal raw material under different synthesis conditions after calcination at 1800 °C Xie, Yadian. Diss. Université du Québec à Chicoutimi, 2017.

Currently, sapphire crystal, the most commonly used LED substrate material, has developed rapidly in recent years due to its excellent optical, chemical and other properties. In the global LED substrate market, 2-inch sapphire crystals are widely used. Nano-alumina particles of purity (5N). Sapphire crystals are produced using a specific intermediate alumina. The average length of the crystal rods produced is calculated using the total length of the crystal rods obtained from each crystal. This is used to determine the effect of different intermediate alumina morphologies on sapphire growth.
Spherical alumina nanoparticles were prepared by a single template method. Different reaction temperatures and contact times were used and calcined to 1800°C. The results showed that after calcination at 1800°C, the diffraction peaks were sharp and regular. This indicates that α-alumina has a single crystal phase, the crystal growth is highly ordered, and the crystallinity is good. All samples were converted to α-alumina. The α-alumina obtained after calcination at 1800°C was used as a raw material in the sapphire growth process using heat exchange. (By a single template method, different reaction temperatures and contact times were used by heating at 600°C). The Al 2 O 3 particles have the same purity but different morphologies. After calcination at 1800°C, the calcined alumina (1800°C) was used as the raw material for growing sapphire using the heat exchange method. Length of sapphire crystal rod.

Study on the application of alumina in refractories

Bulk density and apparent porosity of fired samples added with different alumina Liao, Guihua, et al. J. Miner. Mater. Charact. Eng 3.2 (2004): 81-89.

The effects of several aluminas on the physical properties of high-purity andalusite-based refractories were studied, and the effects of the types and addition amounts of alumina on the phase composition and microstructure of the refractories were studied by X-ray diffraction and scanning electron microscopy. The results show that the sintering properties of the refractory samples without alumina addition are better than those of the refractory samples with alumina addition, while the effects of the selected samples with alumina addition on the sintering properties of high-purity andalusite-based refractories are related to the purity and activity of the added alumina samples. The SiO2 glass phase derived from the decomposed andalusite aggregate cannot completely react with the added alumina to form secondary mullite. Moreover, when the addition amount of alumina reaches about 15% (mass percentage), more extensive secondary mullitization and greater expansion are observed in the experimental samples.
First, equal amounts of sintered alumina, fused brown corundum, bauxite-based corundum and activated alumina were added to the sample matrix, respectively, to investigate the effects of different alumina samples on the physical properties of HPABR. Secondly, the selected alumina samples were fixed, and the effect of adding fixed alumina on the physical properties of HPABR was further studied. All samples were formed by an oil press at a pressure of 200 MPa. After drying for about 24 hours, the green body was fired in an electric furnace at 1500°C and kept for 3 hours of soaking time. After the fired samples were cooled, their bulk density, porosity, crushing strength, firing expansion and re-firing expansion were tested. The creepage performance of some samples was also tested, and the microstructure of the selected samples was observed by SEM. In addition, the phase composition test was also carried out on some samples. When the diffractometer tested the samples, the working voltage was 35KV and the working current was 40mA.

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