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Aluminium oxide has firmly established itself as a technical ceramic. This development is driven by the increasing miniaturisation of components, which calls for a material with modifiable property and machining profiles. The property profile of aluminium oxide gives it multifunctional applications. Consequently, aluminium oxide is very hard, extremely resistant to wear and corrosion.

Aluminium oxide is the oxygen compound of the element aluminium. The raw material for this substance is the aluminium ore bauxite. Caustic soda lye is used to split this ore into aluminium hydroxide. Calcination and complex grinding processes are used to create high-quality, high-purity AI2O3.

The aluminium oxide used in our products offers excellent corrosion resistance and high dielectric strength, which explains its frequent use as an insulator.

Aluminium oxide is also extremely hard and highly resistant to abrasion and wear. In comparison with other ceramics, this material is an excellent heat conductor.

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Overview of materials for high-performance ceramics

DOCERAM Bezeichnung
Unit A-132 A-141 Z-141 Cerazur Volcera 141 EvoCera
- AI2O3
ZrO2 Y-PSZ ZrO2 Y-PSZ Si3N4 -
- elfenbein
grau, schwarz
grey, black
(g/cm3) 3.9 3.9 >6.04 6 3.2 5.9
Flexural Strength
(MPa) 390 390 1200 1300 1000 400
Compressive Strength
(MPa) 3900 3900 3000 3000 2500 3000
Modulus of Elasticity
(GPa) 390 390 205 205 320 218
Fracture Toughness
(MPa√m) 5.2 5.2 8 12 6.4 -
Weibull Modul
Weibull Modulus
- 12 12 12 25 14 50
Vickers Härte
Vickers Hardness
(HV 0.5) 2000 2000 1300 1150 1650 1047
Thermal Expansion Coefficient
(10 -6K-1) 5.5-8.4 5.5-8.4 10 10 3.4 11.1
Thermal Conductivity
(W/mK) 28 28 <2 <2 22 3.55
Temp. Wechselbeständigkeit
Thermal-Shock Resistance
(ΔT°C) 120 180 290 280 830 -
Maximale Einsatztemperatur
Maximum Operating Temperature
(°C) 1700 1700 1000 1000 1200 -
Spez. Widerstand bei 20°C
Volume Resistivity at 20°C
(Ω cm) > 1017 > 1015 > 1010 > 1010 > 1011 -
Dielectric Strength
(kV/mm) 22 30 - - 20 -

The values listed were determined on standard test specimens. The material properties may deviate from these values depending on the applications and component geometry. Please contact us for precise clarification of the material suitability. Other technical data on request. Subject to technical modifications and errors. 2014 edition.

Sample Solutions

CAD portal

Our components from high-performance ceramics can also be configured on-line. All product variants are stored in our CAD portal - you can make adjustments quickly and easily by entering the parameters for your welding process.

Slide rings

Slide rings and mating rings are the two main components of a slide-ring seal. The slide ring and mating ring are in constant contact. However, they do not touch one another but slide over each other.

Bobbin cores

Bobbin cores are usually round parts with a large groove into which a copper coil is wound. This coil induces a magnetic field in the centre of the coil.

Vacuum-tight components

Many technical processes such as semiconductor fabrication, medical technology or material testing are conducted in a vacuum.

Dosing components

The dosing systems used in the field of dosing technology are being continuously optimized and advanced.

Flow measurement

One of the most important variables in industrial measurement technology alongside temperature, pressure and force is flow measurement, which is one of the fundamentals of process automation.

Punching stamps

Punching stamps must repeatedly punch a contour in a predetermined geometry into a sheet.

Goods carriers

Goods carriers are used to hold other products, such as circuit boards. In many cases, they must be electrically insulating, wear-resistant and designed to cope with thermal shock to enable smooth handling.

Heat insulation board

DOTHERM and ISOCOS offer heat protection plates that are precisely adapted to the respective process requirements in terms of material, compression strength, temperature resistance and dimensional stability.

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