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Characterization and stabilization of Si3N4 suspensions

Published online by Cambridge University Press:  03 March 2011

C. Galassi ,
E. Rastelli ,
E. Roncari ,
S. Ardizzone  and
M.G. Cattania
C. Galassi
Affiliation:
IRTEC-CNR, Via Granarolo 64, 48018 Faenza, Italy
E. Rastelli
Affiliation:
IRTEC-CNR, Via Granarolo 64, 48018 Faenza, Italy
E. Roncari
Affiliation:
IRTEC-CNR, Via Granarolo 64, 48018 Faenza, Italy
S. Ardizzone
Affiliation:
Department of Physical Chemistry and Electrochemistry, University of Milan, Via Golgi 19, 20133 Milan, Italy
M.G. Cattania
Affiliation:
CSRSRC-CNR and Department of Physical Chemistry and Electrochemistry, University of Milan, Via Golgi 19, 20133 Milan, Italy
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Abstract

Two commercial Si3N4 powders were mixed with Al2O3 and Y2O3 through coprecipitation of the oxides from solutions of nitrates. The samples were characterized by XPS spectroscopy and electrophoretic mobility determinations on the suspensions. Sedimentation tests indicated that an oxylignin-based polyelectrolyte proved effective in the dispersion of the powders. The adsorption of the deflocculant followed Langmuir type isotherms characterized by values of the standard free energy of adsorption in the range typical of physisorption processes. The results of the different characterizations are discussed point by point, and different localizations of the dispersant in the interfacial region of the different samples are proposed.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 2 , February 1995 , pp. 339 - 344
Copyright
Copyright © Materials Research Society 1995

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