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Amorphous ceramics as the particulate phase in electrorheological materials systems

Published online by Cambridge University Press:  31 January 2011

Daniel R. Gamota ,
Adam W. Schubring ,
Brian L. Mueller  and
Frank E. Filisko
Daniel R. Gamota
Affiliation:
Motorola, Corporate Manufacturing Research Center, Schaumburg, Illinois 60196
Adam W. Schubring
Affiliation:
Delco Electronics Corp., Hybrid Microelectronics Manufacturing, Kokomo, Indiana 46904
Brian L. Mueller
Affiliation:
Henkel Corporation, Parker & Amchem, Madison Heights, Michigan 48071
Frank E. Filisko
Affiliation:
Department of Materials Science and Engineering, College of Engineering, The University of Michigan, Ann Arbor, Michigan 48109–2136
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Abstract

Several electrorheological (ER) materials systems composed of amorphous ceramic powders dispersed in light paraffin oil were developed to determine if relationships among ER activities, dielectric properties, compositions, porosities, and oxide species could be identified. The results of the studies suggested that trends among ER activity, dielectric phenomena, and alkali metal species existed. The aluminosilicate powders developed with various alkali metals showed that the ER activity increased as the activation energy decreased. The sodium aluminosilicate appeared to have the greatest ER activity and the lowest activation energy, while the cesium aluminosilicate displayed the weakest ER response, but had the highest activation energy. The thermodielectric responses of the different oxide materials systems developed with sodium showed that the mechanisms contributing to the dielectric dispersions had similar activation energies; however, the magnitudes of the recorded ER activities varied, and thus a direct correlation was not apparent. In addition, studies conducted with ER materials composed of sodium aluminosilicate powders of varying porosities showed that ER activities increased with increasing porosity. Furthermore, the analysis of the results of the thermodielectric and rheological studies of the different amorphous materials ER systems suggested that these materials may have an optimal stimulus frequency/temperature for ER activity.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 1 , January 1996 , pp. 144 - 155
Copyright
Copyright © Materials Research Society 1996

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