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Alumina ceramics Al2O3

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Alumina ceramics Al2O3 are one of the most durable ceramics available. The outstanding properties of alumina ceramics make it one of the most widely used ceramics in structural, wear and corrosion environments.

Precision and machinable ceramic material

Alumina ceramics Al2O3

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WAYNE MATERIALS offers a variety of precision ceramics and machinable ceramics.

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About Alumina ceramics   Al2O3

Alumina ceramics Al2O3 are one of the most durable ceramics available. The outstanding properties of alumina ceramics make it one of the most widely used ceramics in structural, wear and corrosion environments. In addition, high purity alumina ceramics have become one of the commonly used materials for semiconductor cavity applications due to their excellent electrical properties.

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Application

Al2O3 is an electrical insulator but has a relatively high thermal conductivity (30 Wm−1K−1)for a ceramic material. Aluminium oxide is insoluble in water.
In its most commonly occurring crystalline form, called corundum or α-aluminium oxide, its hardness makes it suitable for use as an abrasive and as a component in cutting tools.


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1. Cavity parts of semiconductor equipment

2. wafer transmission parts

3. Parts for production equipment of Flat panel display

4. thermal and electrical insulating parts


Other Application:


A. illers

Being fairly chemically inert and white, aluminium oxide is a favored filler for plastics. Aluminium oxide is a common ingredient in sunscreen and is sometimes also present in cosmetics such as blush, lipstick, and nail polish.

B. Glass

Many formulations of glass have aluminium oxide as an ingredient.

C. Catalysis

Aluminium oxide catalyses a variety of reactions that are useful industrially. In its largest scale application, aluminium oxide is the catalyst in the Claus process for converting hydrogen sulfide waste gases into elemental sulfur in refineries. It is also useful for dehydration of alcohols to alkenes.

Aluminium oxide serves as a catalyst support for many industrial catalysts, such as those used in hydrodesulfurization and some Ziegler-Natta polymerizations.

D. Water purification

Aluminium oxide is widely used to remove water from gas streams.

E. Abrasive

Aluminium oxide is used for its hardness and strength. It is widely used as an abrasive, including as a much less expensive substitute for industrial diamond. Many types of sandpaper use aluminium oxide crystals. In addition, its low heat retention and low specific heat make it widely used in grinding operations, particularly cutoff tools. As the powdery abrasive mineral aloxite, it is a major component, along with silica, of the cue tip "chalk" used in billiards. Aluminium oxide powder is used in some CD/DVD polishing and scratch-repair kits. Its polishing qualities are also behind its use in toothpaste.

F. Paint

Aluminium oxide flakes are used in paint for reflective decorative effects, such as in the automotive or cosmetic industries.

G. Composite fiber

Aluminium oxide has been used in a few experimental and commercial fiber materials for high-performance applications, Alumina nanofibers in particular have become a research field of interest.

H. Body armor

Some body armors utilize alumina ceramic plates, usually in combination with aramid or UHMWPE backing to achieve effectiveness against even most rifle threats. Alumina ceramic armor is readily available to most civilians in jurisdictions where it is legal, but is not considered military grade.

I. Abrasion protection

Aluminium oxide can be grown as a coating on aluminium by anodizing or by plasma electrolytic oxidation. Both the hardness and abrasion-resistant characteristics of the coating originate from the high strength of aluminium oxide, yet the porous coating layer produced with conventional direct current anodizing procedures is within a 60-70 Rockwell hardness C range which is comparable only to hardened carbon steel alloys, but considerably inferior to the hardness of natural and synthetic corundum. Instead, with plasma electrolytic oxidation, the coating is porous only on the surface oxide layer while the lower oxide layers are much more compact than with standard DC anodizing procedures and present a higher crystallinity due to the oxide layers being remelted and densified to obtain α-Al2O3 clusters with much higher coating hardness values circa 2000 Vickers hardness.

J. Electrical insulation

Aluminium oxide is an electrical insulator used as a substrate (silicon on sapphire) for integrated circuits but also as a tunnel barrier for the fabrication of superconducting devices such as single electron transistors and superconducting quantum interference devices (SQUIDs).

For its application as an electrical insulator in integrated circuits, where the conformal growth of a thin film is a prerequisite and the preferred growth mode is atomic layer deposition, Al2O3 films can be prepared by the chemical exchange between trimethylaluminum (Al(CH3)3) and H2O:

2 Al(CH3)3 + 3 H2O → Al2O3 + 6 CH4

H2O in the above reaction can be replaced by ozone (O3) as the active oxidant and the following reaction then takes place:

2 Al(CH3)3 + O3 → Al2O3 + 3 C2H6

The Al2O3 films prepared using O3 show 10~100 times lower leakage current density compared with those prepared by H2O.

Features

 

 

 

 

AS999

AG999

AM997

General features

characteristics

High purity

Resistance of the plasma

degree

Main component purity (wt%)

99.99

99.9

99.7

color

white

Yellow white

Yellow white

density (g/cm3)

3.95

3.93

3.93

Water imbibition (%)

0

0

0

Mechanical properties

Bending strength (MPa)

390

390

390

Young's modulus (GPa)

380

380

375

Vickers hardness (GPa)

18

17

18

Thermal characteristics

Maximum operating temperature (°C)

1600

1600

1600

Coefficient of thermal expansion (1/°C×10-6)

RT~500°C

7

7.4

7

RT~800°C

7.7

8.1

7.6

Coefficient of thermal conductivity (W/m×K)

33

30

33

Thermal shock resistance ΔT (°C)

200

-

200

Electrical characteristics

Volume resistivity

25°C

1015

1015

1016

300°C

1012

-

1013

500°C

109

-

1010

800°C

107

-

109

Dielectric constant

10GHz

9.9

9.7

9.7

Dielectric loss (×10-4)

0.5

6

1

Q Factor (×104)

2

0.2

1

Dielectric breakdown voltage (KV/mm)

18

17

18

 


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Aluminium oxide 1178910