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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 excellent mechanical strength. The material, also called aluminum oxide, offers outstanding electrical insulation properties, low dissipation, and tremendous dielectric strength. These properties enable high voltage electrical applications.

The mechanical characteristics of advanced Al2O3 ceramic materials are also remarkable. Hence, aluminum oxide materials are ideal for producing components that need to withstand high mechanical load as Al2O3 offers an exceptional wear resistance. So, due to its superior tribological, much longer lifetimes of parts and workpieces are achieved with Al2O3. Furthermore, the chemical strength of alumina is considerable. It can resist most acids and alkalis, even at increased temperatures.

Since grinding aluminum oxide materials using conventional abrasive tools on conventional CNC machines is possible, the unique ceramic material allows the manufacturing of complex workpieces. The potential complexity of the components manufactured from aluminum oxide is limited only by the machinery used, so even complex precision workpieces are produced from 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 × 10-7 / °C (20–700 °C)
  • 86 × 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 provided here are mean reference values and are not guaranteed. Moreover, please consider the “Notes on Specifications”.

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Last update: May 16, 2024