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Aluminum oxide

Aluminum oxide
Aluminum oxide structure
CAS No.
11092-32-3
Chemical Name:
Aluminum oxide
Synonyms
RUBY;AlO2;ALUMINA;ALUNDUM;CORUNDUM;CORUNDUM;SAPPHIRE;CORUNDUM;ALUMINA R;ALUMINA A
CBNumber:
CB3490231
Molecular Formula:
Al2O3
Formula Weight:
101.96
MOL File:
11092-32-3.mol

Aluminum oxide Properties

Melting point:
2040 °C(lit.)
Boiling point:
2977 °C
Density 
1.06 g/mL at 25 °C
form 
powder
Water Solubility 
Insoluble in water.
CAS DataBase Reference
11092-32-3(CAS DataBase Reference)
EWG's Food Scores
1
SAFETY
  • Risk and Safety Statements
Hazard Codes  Xi
Risk Statements  36/37/38
Safety Statements  26
RIDADR  UN1263
WGK Germany  -
RTECS  BD1200000
3
TSCA  Yes
HazardClass  3
PackingGroup  III

Aluminum oxide price More Price(6)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 1.15754 Aluminium oxide fibers for gooch crucibles 11092-32-3 100 g $70.95 2021-03-22 Buy
Sigma-Aldrich 1.15754 Aluminium oxide fibers for gooch crucibles 11092-32-3 1 kg $507.82 2021-03-22 Buy
Alfa Aesar 036649 Aluminum oxide, single crystal 11092-32-3 1pc $75.7 2021-03-22 Buy
Alfa Aesar 036649 Aluminum oxide, single crystal 11092-32-3 5pc $276 2020-06-24 Buy
Alfa Aesar 044849 Aluminum oxide, catalyst support, low silica 11092-32-3 1kg $140 2020-06-24 Buy

Aluminum oxide Chemical Properties,Uses,Production

Characteristics

Aluminum Oxide (Alumina) is the most widely used oxide, chiefly because it is plentiful, relatively low in cost, and equal to or better than most oxides in mechanical properties. Density can be varied over a wide range, as can purity — down to about 90% alumina — to meet specific application requirements. Alumina ceramics are the hardest, strongest, and stiffest of the oxides. They are also outstanding in electrical resistivity, dielectric strength, are resistant to a wide variety of chemicals, and are unaffected by air, water vapor, and sulfurous atmospheres. However, with a melting point of only 2039°C, they are relatively low in refractoriness, and at 1371°C retain only about 10% of room-temperature strength. In addition to its wide use as electrical insulators and its chemical and aerospace applications, the high hardness and close dimensional tolerance capability of alumina make this ceramic suitable for such abrasion-resistant parts as textile guides, pump plungers, chute linings, discharge orifices, dies, and bearings.

Definition

A mineral form of aluminiumoxide, Al2O3. It crystallizesin the trigonal system and occurs aswell-developed hexagonal crystals. Itis colourless and transparent whenpure but the presence of other elementsgives rise to a variety ofcolours. Ruby is a red variety containingchromium; sapphire is ablue variety containing iron andtitanium. Corundum occurs as arock-forming mineral in both metamorphicand igneous rocks. It ischemically resistant to weatheringprocesses and so also occurs in alluvial(placer) deposits. The secondhardest mineral after diamond (it hasa hardness of 9 on the Mohs’ scale), itis used as an abrasive.

Preparation

Pure alumina, needed to produce aluminum by the Hall process, is made by the Bayer process. The starting material is bauxite (Al2O3 ? nH2O). The ore contains impurities, such as, SiO2, Fe2O3, TiO2, and Na2O. Most impurities are removed following treatment with caustic soda solution. Bauxite is dissolved in NaOH solution. Silica, iron oxides and other impurities are filtered out of the solution. CO2 is then bubbled through this solution. This precipitates out hydrated alumina, which is heated to remove water and produce Al2O3. These impurities are removed. Calcinations of bauxite produce alumina of abrasive and refractory grades. Activated aluminas of amorphous type, as well as the transition aluminas of γ, η, χ, and ρ forms, are obtained from various aluminum hydroxides, such as, α- and β-trihydrates, α-monohydrate and alumina gel. Such chemicals are obtained from bauxite by the Bayer process also.

Hazard

Chronic inhalation of Al2O3 dusts may cause lung damage.

Agricultural Uses

Alumina is a white or colorless oxide occurring in two forms, a-alumina and γ-alumina. The γ-alumina turns into a stable a form on heating. Naturally occurring alumina is called corundum or emery.
The gemstones ruby and sapphire are aluminum oxides colored by minute traces of chromium and cobalt, respectively. The highly protective film of oxide formed on the surface of aluminum is yet another structural variation, a defective form of rock salt.
Pure aluminum oxide is obtained by dissolving bauxite ore in sodium hydroxide solution to eliminate insoluble impurities. Seeding the solution with material from a previous batch precipitates the hydrated oxide, which on further heating gives γ-alumina at 500 to 800°C and pure a-alumina at 1150 to 1200°C. The latter is one of the hardest materials known. It is used widely as an abrasive substance in both its natural and synthetic forms. Its refractory nature makes alumina bricks an ideal material for furnace linings and high temperature cements.
Alumina occurs in phosphate rocks along with iron and other impurities in small percentages. Alumina and iron in phosphate rock make the superphosphate moist and sticky. The maximum acceptable alumina and iron in the rock for farming is 3 to 4 %

Materials Uses

Fused aluminum oxide was the second synthetic abrasive to be developed. Synthetic aluminum oxide (alumina) is made as a white powder and can be somewhat harder than corundum (natural alumina) because of its purity. However, corundum has a Mohs hardness of approximately 9 (on a scale of 1 to 10. Alumina can be processed with different properties by slight alteration of the reactants in the manufacturing process. Several grain sizes of alumina are available, and alumina has largely replaced emery for several abrasive uses. Aluminum oxide is widely used to make bonded abrasives, coated abrasives, and air-propelled grit abrasives for dental applications.
Sintered aluminum oxide is used to make white stones, which are popular for adjusting dental enamel and finishing metal alloys, resin-based composites, and ceramic materials.
Pink and ruby variations of aluminum oxide abrasives are made by adding chromium compounds to the original melt. These variations are sold in a vitreous-bonded form as noncontaminating mounted stones for the preparation of metal– ceramic alloys to receive porcelain. Remnants of these abrasives and other debris should be removed from the surface of metals used for metal–ceramic bonding so as not to prevent optimal bonding of porcelain to the metal alloy. A review by Yamamoto (see Selected Reading) suggests that carbide burs are the most effective instruments for finishing this type of alloy because they do not contaminate the metal surface with entrapped abrasive particles.
CORUNDUM: This mineral form of aluminum oxide is usually white. Its physical properties are inferior to those of manufactured alpha (α) aluminum oxide (Al2O3), which has largely replaced corundum in dental applications. Corundum is used primarily for grinding metal alloys and is available as a bonded abrasive in several shapes. It is most commonly used in an instrument known as a white stone.

Aluminum oxide Preparation Products And Raw materials

Raw materials

Preparation Products


Aluminum oxide Suppliers

Global( 58)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Chemson Industrial (Shanghai) Co., Ltd.
86-21-65208861-ext8007
86-21-65180813 sales1@chemson.com.cn CHINA 117 58
Henan DaKen Chemical CO.,LTD.
+86-371-66670886
info@dakenchem.com China 21022 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693
0371-55170693 info@tianfuchem.com CHINA 22607 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 info@tnjchem.com China 3001 55
Hubei Jusheng Technology Co.,Ltd.
86-18871470254
027-59599243 linda@hubeijusheng.com CHINA 28229 58
career henan chemical co
13203830695 0086-371-86658258
0086-371-86658258 factory@coreychem.com CHINA 29865 58
Hefei TNJ Chemical Industry Co.,Ltd.
0551-65418671
0551-65418697 sales@tnjchem.com CHINA 37441 58
Mainchem Co., Ltd. +86-0592-6210733
+86-0592-6210733 sale@mainchem.com CHINA 32439 55
3B Pharmachem (Wuhan) International Co.,Ltd. 18930552037 821-50328103-801
86-21-50328109 3bsc@sina.com China 15877 69
Alfa Aesar 400-610-6006
021-67582001/03/05 saleschina@alfa-asia.com China 30159 84

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View Lastest Price from Aluminum oxide manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2020-02-01 aluminum oxide
11092-32-3
US $1.00 / KG 1KG Min98% HPLC G/KG/TON Career Henan Chemical Co
2018-04-25 Alumina; Aluminum Oxide
11092-32-3
US $22.60 / KG 25KG 99.999%; 99.99%; 99.9% 1000tons Chemson Industrial (Shanghai) Co., Ltd.

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