Al₂O₃ Aluminum Oxide

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)

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

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.