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Synthesis, Characterization, and Processing of Cordierite‐Glass Particles Modified by Coating with an Alumina Precursor
Author(s) -
Mei Sen,
Yang Juan,
Monteiro Regina,
Martins Rodrigo,
Ferreira José M. F.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00058.x
Subject(s) - cordierite , materials science , coating , scanning electron microscope , microstructure , transmission electron microscopy , composite material , amorphous solid , chemical engineering , precipitation , layer (electronics) , ceramic , crystallography , nanotechnology , chemistry , physics , meteorology , engineering
The surfaces of cordierite and glass particles were modified by coating them with an alumina precursor using a precipitation process in the presence of urea. Scanning electron microscopy (SEM), high‐resolution transmission electron microscopy, X‐ray diffraction, electrophoresis, and rheological measurements were used to characterize the coated powders. SEM and transmission electron microscopy morphologies of the coated powders revealed that amorphous and homogeneous coatings have been formed around the particles. The morphology of the coated powders showed a coiled wormlike surface. The coating Al 2 O 3 layer dominated the surface properties of the coated glass and cordierite powders. The influence of the coating layer on the processing ability of cordierite‐based glass‐ceramics substrates by tape casting was studied in aqueous media. It could be concluded that the coating of the powders facilitates the processing and yields green and sintered tapes with denser, more homogeneous microstructures compared with the uncoated powders.