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Al2O3 Aluminum Oxide

Alumina high-performance ceramics

Special Properties

  • High purity of 99,7%
  • High mechanical strength and wear resistance
  • Excellent thermal resistance
  • Outstanding insulation characteristics
  • Extreme dielectric strength
  • Exceptional tribological properties
  • Can be processed with conventional abrasive tools
  • Low dissipation factor
  • High chemical resistance
  • Good metallizability
  • Very hard material structure

Typical Applications

  • Heat resistant ceramic components
  • Electrical performance insulators
  • Space applications
  • Dielectric for capacitors
  • Welding nozzles
  • Ceramic Bushings
  • Wear-resistant components

Related ceramic products

  • MACOR® (Machinable Glass Ceramic (MGC))
  • SHAPAL™ Hi M-soft (Machinable aluminum nitride ceramics)

 

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Characteristics of Al2O3 aluminum oxide

Al2O3 alumina is a white and opaque high performance ceramic with exceptional physical characteristics. It is very temperature resistant and offers an excellent mechanical strength. The material, also called aluminum oxide, offers excellent electrical insulation properties, has a low dissipation factor, and a tremendous dielectric strength. These properties enable the use in high voltage electrical applications.

The mechanical characteristics of advanced Al2O3 ceramic materials are also remarkable. Hence, aluminum oxide materials are often used when components must withstand strong mechanical wear as Al2O3 offers an excellent wear resistance. So due to its superior tribological much longer lifetimes of parts and workpieces can be achieved with Al2O3. Furthermore, the chemical strength of alumina is considerable. It can resist most acids and alkalis even at increased temperatures.

Since aluminum oxide materials can be ground using conventional abrasive tools on conventional CNC-machines, the manufacturing of complex workpieces based on this special ceramic material is possible. The potential complexity of the components manufactured of aluminum oxide is limited only by the machinery used, so even precision workpieces with a complex structure can be produced of Al2O3 aluminum oxide. To request further specific information about our aluminum oxide materials, please enter your queries into our information request form.

 

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Specifications

Raw Density

  • 3,75 - 3,94 g/cm3

Purity

  • 99,7% Al2O3 (Alumina /Aluminium oxide)

Type classified by DIN EN 60672

  • C799

Coefficient of Expansion

  • 78 x 10-7 / °C (20 - 700°C)
  • 86 x 10-7 / °C (20 - 1000°C)

Thermal

  • Max. operating temperature under
    mechanical load: approx. 1700°C
  • Good thermal shock resistance
  • Specific heat capacity: 990 J kg-1 K-1
    (20 - 100°C)

Mechanical

  • Modulus of elasticity: 300-380 GPa
  • Mohs hardness: 9
  • Modulus of rupture: 300 Gpa (20°, 3-Point)

Electrical

  • Electric strength: 17 kV/mm (IEC 672-2)
  • Specific DC-resistance: 1014 Ω cm (20°C)

Other specifications

  • Water absorption capacity: ≤ 0,2%
  • Leak rate: 10-10 hPa dm3 s-1 (20°C)

 

All given details and specifications given here are mean reference values and are not guaranteed. Also, please consider our "Notes on technical specifications".

 

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