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Aluminum oxide

Product Name
Aluminum oxide
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
AlO2
Formula Weight
58.98
MOL File
11092-32-3.mol
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Aluminum oxide Property

Melting point:
2040 °C(lit.)
Boiling point:
2977 °C
Density 
1.06 g/mL at 25 °C
form 
powder
Water Solubility 
Insoluble in water.
Exposure limits
ACGIH: TWA 1 mg/m3
OSHA: TWA 15 mg/m3; TWA 5 mg/m3
Dielectric constant
4.5(Ambient)
CAS DataBase Reference
11092-32-3(CAS DataBase Reference)
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Safety

Hazard Codes 
Xi
Risk Statements 
36/37/38
Safety Statements 
26
RIDADR 
UN1263
WGK Germany 
-
RTECS 
BD1200000
3
TSCA 
Yes
HazardClass 
3
PackingGroup 
III
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Hazard and Precautionary Statements (GHS)

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N-Bromosuccinimide Price

Alfa Aesar
Product number
036649
Product name
Aluminum oxide, single crystal
Packaging
1pc
Price
$75.7
Updated
2021/12/16
Alfa Aesar
Product number
036649
Product name
Aluminum oxide, single crystal
Packaging
5pc
Price
$276
Updated
2021/12/16
Alfa Aesar
Product number
044849
Product name
Aluminum oxide, catalyst support, low silica
Packaging
5kg
Price
$547
Updated
2021/12/16
Alfa Aesar
Product number
044849
Product name
Aluminum oxide, catalyst support, low silica
Packaging
1kg
Price
$140
Updated
2021/12/16
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Aluminum oxide Chemical Properties,Usage,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.

Uses

Aluminum oxide is used for the separation of both inorganic anions and acidic organic molecules such as acidic amino acids, aromatic acids and carboxylic acids. It is essential in protein extraction as a component in the preparation of tissues. It is also used as a grinding or blending agent. Aluminum oxide is a source of aluminum in reactions, an abrasive agent, and as a refractory material. Also Aluminum oxide can act as a catalyst in a variety of reactions such as the claus process and in the dehydration of alcohols to alkenes. In single crystals of aluminum oxide intrinsic diffusion occurs in a high temperature region.

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.

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.

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

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Aluminum oxide Suppliers

3B Pharmachem (Wuhan) International Co.,Ltd.
Tel
821-50328103-801 18930552037
Fax
86-21-50328109
Email
3bsc@sina.com
Country
China
ProdList
15848
Advantage
69
Alfa Aesar
Tel
400-6106006
Fax
021-67582001/03/05
Email
saleschina@alfa-asia.com
Country
China
ProdList
30132
Advantage
84
Yurui (Shanghai) Chemical Co., Ltd.
Tel
02150456736 13818239876
Fax
021-50761379
Email
xin@riyngroup.com
Country
China
ProdList
1130
Advantage
30
Hefei TNJ Chemical Industry Co.,Ltd.
Tel
0551-65418671
Fax
0551-65418697
Email
sales@tnjchem.com
Country
China
ProdList
34572
Advantage
58
Hubei Jusheng Technology Co.,Ltd.
Tel
18871490254
Fax
027-59599243
Email
linda@hubeijusheng.com
Country
CHINA
ProdList
28180
Advantage
58
career henan chemical co
Tel
+86-0371-86658258 15093356674;
Fax
0086-371-86658258
Email
factory@coreychem.com
Country
China
ProdList
29826
Advantage
58
Energy Chemical
Tel
021-58432009 400-005-6266
Fax
021-58436166
Email
marketing1@energy-chemical.com
Country
China
ProdList
44894
Advantage
58
Hubei yongkuo Technology Co., Ltd
Tel
027-59223108 15972152991
Fax
027-59223108
Email
1248580099@qq.com
Country
China
ProdList
10007
Advantage
58
Hubei Wande Chemical Co., Ltd
Tel
027-59210159 15377098680
Fax
027-59210159
Email
1148280011@qq.com
Country
China
ProdList
9994
Advantage
58
Wuhan Penglei Biological Technology Co., Ltd.
Tel
18672616696
Email
229092275@qq.com
Country
China
ProdList
707
Advantage
58
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View Lastest Price from Aluminum oxide manufacturers

Career Henan Chemical Co
Product
aluminum oxide 11092-32-3
Price
US $1.00/KG
Min. Order
1KG
Purity
Min98% HPLC
Supply Ability
G/KG/TON
Release date
2020-01-28
Chemson Industrial (Shanghai) Co., Ltd.
Product
Alumina; Aluminum Oxide 11092-32-3
Price
US $22.60/KG
Min. Order
25KG
Purity
99.999%; 99.99%; 99.9%
Supply Ability
1000tons
Release date
2018-04-24

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