Ceramic materials are inorganic and non-metallic.
Usually they are shaped from the "green body" at room temperature and acquire their typical properties during a sintering process at high temperatures.
Technical Ceramics means ceramic products made for technical application.
The use of technical ceramics in a large application field is justified by the diversity of properties offered by materials used for parts manufacturing.
Examples of technical ceramic materials:
The choice of the material depends on properties it brings to the final part:
- Thermal properties
- Mechanical properties
- Electric properties
There is also another range of materials used for parts asking less severe stress:
Main ceramic groups
In accordance with their chemical composition the technical ceramic materials can be divided into main groups:
The material of this group consist 90% of single phase and single component metal oxides.
Synthetic raw materials with a high level of purity lead to an even structure with very good properties at a very high sintering temperature.
Ceramic materials compounds of silicon and aluminium with nitrogen or carbon belong to this group.
In general nonoxide ceramics demonstrate a high share of covalence bonding which provides them with very good mechanical properties, even when being used at high temperatures. Amongst nonoxide ceramics are:
These materials combine the basic electrical, mechanical and thermal properties of technical ceramics
Fundamental ingredients of this multi-phase material are clay, kaolin, as well as feldspar and soapstone as silicate carrier. Further ingredients such as alumina and zirconia (ZrSiO4) are added to achieve specific properties.