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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.
In accordance with their chemical composition the technical
ceramic materials can be divided into main groups :
These materials from natural raw 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.
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The material of this group consist 90% of single phase and single component
metal oxides. These materials are glass-phase low or
glass-phase free. Synthetic raw materials with a high
level of purity lead to an even structure with very
good properties at a very high sintering temperature.
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NONOXIDE CERAMICS
Ceramic materials e.g. compounds of silicon and aluminium
with nitrogen or carbon belong to this group. In general
nonoxide ceramics demonstrate a high share of covalency
bonding which provides them with very good mechanical
properties, even when being used at high temperatures.
Amongst nonoxide ceramics are:
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10. Mai 2005
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Material
