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Influence of the Manufacturing Technique on the Macro‐ and Microstructure of Reticulated Carbon‐Bonded Alumina Foams
Author(s) -
Schramm Alina,
Voigt Claudia,
Hubálková Jana,
Scharf Christiane,
Aneziris Christos G.
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201900525
Subject(s) - materials science , microstructure , composite material , coating , slurry , carbon fibers , scanning electron microscope , ceramic , porosimetry , porosity , composite number , porous medium
Carbon‐bonded alumina foams, prepared by means of the replica technique, are typically used as metal melt filters for the filtration of steel due to their low wettability and their good resistance towards thermal shock and corrosion. According to literature, there are different process routes for the preparation of carbon‐bonded alumina foams, for example, dipping/rolling, spray‐ and dip/centrifugation coating. The influence of such process variations on macro‐ and microstructure and mechanical properties of carbon‐bonded ceramic foams has not been analyzed fully yet. Herein, carbon‐bonded alumina foams are manufactured by applying varying process routes regarding slurry preparation and coating steps. The macrostructure of the foams is analyzed by computer tomography, and for evaluating the microstructure, mercury intrusion porosimetry, optical microscopy, and scanning electron microscopy are applied. The determination of the cold‐crushing strength of the carbon‐bonded alumina foams allows the correlation of the structure and mechanical properties.