Kurzfassung

Current research results clearly show that refractory products that do not develop a melt phase,
mostly comprising a single component/crystalline phase, behave very brittle up to high tempera-
ture (e.g. hydratable alumina bonded high alumina refractory castables, magnesia bricks), while
more complex refractory systems, mostly multi components and presenting different crystalline
phases are able to developed a large degree of ductility at high temperature (CA bonded high
alumina refractory...Current research results clearly show that refractory products that do not develop a melt phase,
mostly comprising a single component/crystalline phase, behave very brittle up to high tempera-
ture (e.g. hydratable alumina bonded high alumina refractory castables, magnesia bricks), while
more complex refractory systems, mostly multi components and presenting different crystalline
phases are able to developed a large degree of ductility at high temperature (CA bonded high
alumina refractory castable, especially spinel forming formulations, magnesia spinel bricks). Be-
sides the development of microstructure hindering the cracks propagation, the presence of melt
phases at a still unknown level is suspected to improve the thermal shock resistance of such
multi components refractory systems.
The research objective of this CORNET project is to build on previous knowledge and increase
and deepen the knowledge about how to develop refractories in which the amount of melt
phase formation and its properties are specifically adjusted. The influence of the melting phase
and its quality (amount and viscosity) on the thermomechanical behaviour can then be investi-
gated. In addition to the investigation the thermal shock resistance, the resistance of the mate-
rial to corrosion shall be tested. This needs methods to apply thermal shocks at high tempera-
ture, test materials against corrosion from liquid slags and metals, stress materials according to
their use (multi-dimensional) and analyse their microstructure in different and innovative ways
(SEM, high-temperature SEM, Raman).
As the approach sees melt phases in refractories as desirable, the new knowledge will also em-
power SMEs from the refractory sector to increase their use of secondary raw materials which
form more melt phases due to inherent impurities, while guaranteeing the performance of the
refractory materials they produce.» weiterlesen» einklappen