Technical ceramics

Werkstoffe CNC Keramikbearbeitung

Technical ceramics, also known as advanced ceramics were first used as electrical insulators in the mid-19th century. Since then, this material has been sourced for a wide range of applications. Technical ceramics acquire most of their properties through a sintering process.

The following describes the common types with regard to ceramic machining. Do you wish the machining of another ceramic material? Then please send us a Request.

Material properties

Properties

Al2O3

SiC

Si3N4

ZrO2

Density p [gcm3]

3,9

3,2

3,3

5,6

Coefficient of expansion a (20°C – 500°C) [1*10-6/K]

7,3

3,7 (40-400°C)

2,8 (40-400°C)

10,4

Max. Operating temperature  [°C]

1950

1400-1750

1600

1700

Flexural strength [MPa]

350

450

1020

400

Compressive strength [MPa]

3500

n.a.

n.a.

2000

E-Modul E [103 N/mm2]

380

440

300

200

Vickers hardness HV1

1760

2345

1428

1400

Note: The property values given are approximate values.

Alumina (Al2O3)

Alumina is the most commonly used technical ceramic material. It has a variety of useful properties, such as high corrosion resistance, hardness, and thermal / electrical insulation. The material is available in a range of purities, allowing it to be used in many different industries.

Relative costs of material:
2/5

Silicon carbide (SiC)

Silicon carbide is taking on an increasing role for machined components with tight tolerances. This material has a very high strength and hardness, despite a low weight. Depending on the manufacturing technique, the type and proportion of composition of this type of ceramic varies. 

Relative costs of material:
4/5

Silicon nitride (Si3N4)

Similar to silicon carbide, silicon nitride is a very hard and wear-resistant material. Very good thermal insulation and high strength make this material special. 

Relative costs of material:
4.5/5

Zirconia (ZiO2)

Zirconia is also available in many different forms, designed for a wide variety of applications. By adding various metal oxides, certain properties of this type of ceramic can be stabilized at room temperature. Examples of variants are yttria- or magnesia-partially stabilized zirconia.

Relative costs of material:
3.5/5
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