Xiamen Unipretec Ceramic Technology Co., Ltd.

China Manufacturer with main products: Alumina Ceramic, Zirconia Ceramic, Silicon Nitride, Boron Nitride, Ceramic Grinding Media, Ceramic Cutting Blade, Ceramic Dosing Pump,...

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Aluminium Oxide Ceramics

FOB Price: 1.00 - 2.00 USD/Piece
Supply Ability: 10,000 Piece/Pieces per Month
Shipping: 30 days, Xiamen Port
Payment Terms: L/C, T/T, Western Union
In Stock
Export Markets: North America, South America, Eastern Europe, Southeast Asia, Mid East, Eastern Asia, Western Europe
Place of Origin: Fujian in China
Packaging Details: carton box

Quick Details

  • Brand Name: UNIPRETEC
  • Model Number: N/A
  • Density: 3.65-3.90 g/cm3
  • color: white, ivory, black, red
  • Alumina Content: 92%, 95%, 96%, 99%
  • Moh's Hardness: 9
  • Water Absorption: 0%
  • Compressive Strength: 2000 - 2500 Mpa
  • Flexural Strengh: 280 - 350 Mpa

Specifications

Aluminium Oxide Ceramics

Alumina is the more common name of Aluminium Oxide and is a hard wearing material used for many applications. Once fired and sintered, it can only be machined using diamond-grinding methods.

Aluminium oxide is an electrical insulator but has relatively high thermal conductivity (35 W/m K). In its most commonly occurring crystalline form, called corundum or a-aluminium oxide, its hardness makes it suitable for use as an abrasive and as a component in cutting tools.

Aluminium oxide is responsible for metallic aluminium's resistance to weathering. Metallic aluminium is very reactive with atmospheric oxygen, and a thin passivation layer of alumina quickly forms on any exposed aluminium surface. This layer protects the metal from further oxidation. The thickness and properties of this oxide layer can be enhanced using a process called anodising. A number of alloys, such as aluminium bronzes, exploit this property by including a proportion of aluminium in the alloy to enhance corrosion resistance. The alumina generated by anodising is typically amorphous, but discharge assisted oxidation processes such as plasma electrolytic oxidation result in a significant proportion of crystalline alumina in the coating, enhancing its hardness.

Alumina's combination of hardness, high temperature operation and good electrical insulation makes it useful for a wide range of applications. Alumina is the most commonly used type of ceramic and is available in purities up to 99.99%.

Different types aluminium oxide ceramics:

- 94% min Al2O3
- 96% min Al2O3
- 97% min Al2O3
- 99% min Al2O3
- Single Crystal Alumina: Synthetic Ruby, Synthetic Sapphire
- Other: ZTA, Zr, others upon request


Characteristics Unit 95 Al2O3 99 Al2O3  ZrO2 SSiC SiSiC B4C HPS3N4
Color white ivory white black black black dark gray
Density g/cm3 3.65 3.88 6.05 3.12 3.06 2.51  3.25
Young's Modulus Gpa 280 350 205 400 320 420 310
Vickers Hardness Gpa 14 20 12 25 22 36 22
Flexural Strength Mpa 280 300 900 400 300 370 850
Compressive Strength Mpa 1700 2000 2500 2200 2000 2900 2800
Thermal Conductivity W/(m?K) 25 30 2.2 100 130 35-40 27
Thermal shock resistance ΔT(C°) 220 180-200 400 350 220 130 450-650
Max. Working Temperature 1500 1700 850 1500 1300 1500 1200
Volume Resistivity ( 20  ) Ω?cm >10^15 >10^14 >10^12 >10^6 >10^6

_

>10^14


Applications:

High Temperature and Aggressive Environments
Its high free energy of formation makes alumina chemically stable and refractory, and hence it finds uses in containment of aggressive and high temperature environments.

Wear and Corrosion Resistance
The high hardness of alumina imparts wear and abrasion resistance and hence it is used in diverse applications such as wear resistant linings for pipes and vessels, pump and faucet seals, thread and wire guides etc.

Biomedical
High purity aluminas are also used as orthopaedic implants particularly in hip replacement surgery.

Metal Cutting Tools
The high " hot" hardness of alumina have led to applications as tool tips for metal cutting (though in this instance alumina matrix composites with even higher properties are more common) and abrasives.

Milling Media
Alumina is used as milling media in a wide range of particle size reduction processes.

Microwave Components
The high dielectric constant coupled with low dielectric loss particularly at high frequencies leads to a number of microwave applications including windows for high power devices and waveguides.

Electrical Insulation
The high volume resistivity and dielectric strength make alumina an excellent electrical insulator which leads to applications in electronics as substrates and connectors, and in lower duty applications such as insulators for automotive spark plugs

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