Influence of the carbon content and the coking temperature on the temperature dependent strength of carbon-bonded alumina (Al2O3-C)

Reference Presenter Authors
(Institution)
Abstract
09-034 Henry Zielke Zielke, H.(TU Bergakademie Freiberg); Schmidt, A.(TU Bergakademie Freiberg); Wetzig, T.(TU Bergakademie Freiberg); Abendroth, M.(TU Bergakademie Freiberg); Kuna, M.(TU Bergakademie Freiberg); Aneziris, C.G.(TU Bergakademie Freiberg); Open cell ceramic foam filters are used for metal melt filtration to enhance the quality of
cast metals by reducing non-metallic inclusions and generating calm mould fill with less turbulences.
A new generation of multifunctional filters made of carbon-bonded alumina is investigated
within the collaborative research center CRC 920. These filters have to withstand
high thermal and mechanical loads due to the filtration process, which requires a temperature
dependent mechanical characterization.
In the Ball On Three Balls Test (B3B) miniaturized disk-shaped specimens are loaded with a
spherical tipped punch until failure occurs. Furthermore, the fracture stress is calculated and
analyzed by means of Weibull distribution.
The experimental methods are applied at different temperatures to specimens with a varying
carbon content and different coking regimes. The aim is to clarify the influence of these parameters
on the strength of the filter material. Additionally, a microstructure analysis supports
the interpretation of the achieved results of the mechanically tested specimens.

Co-Authors: A. Schmidt, T. Wetzig, M. Abendroth, M. Kuna, C. G. Aneziris
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