Compositions – Piezoelectric
Reexamination Certificate
2002-02-01
2004-07-13
Kopec, Mark (Department: 1751)
Compositions
Piezoelectric
C252S062000, C252S502000, C252S509000, C252S511000, C310S340000, C525S242000, C525S276000
Reexamination Certificate
active
06761831
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a component having vibration-damping properties, a mixture for manufacturing the component, and a method of manufacturing such a component.
BACKGROUND INFORMATION
“New damping materials composed of piezoelectric and electro-conductive, particle-filled polymer composites: effect of electromechanical coupling factor” by M. Sumita et al., in Mackromol. Chem. Rapid Commun. 12, pp. 657 to 661 (1991), may, for example, be a species-forming underlying article.
The species-forming underlying article describes a film where piezoelectric particles made of a piezoceramic and graphite as a conductive medium are embedded in a polymer matrix. According to this publication, vibrations are damped when the proportion of graphite is between about 5% and 9% by volume. In this range, the electrical conductivity of the foil also increases considerably at the same time.
It is an object of the present invention to provide a coating so that damping of vibrations occurs also for complete components in principle also without addition of conductive arrangements. Furthermore, the object of the present invention is to provide a mixture and a method for manufacturing such components.
SUMMARY
The above and other beneficial objects of the present invention are achieved by providing a component, a mixture and a method as described herein. Despite the contrary findings of the underlying publication, damping is achieved by the use of pre-polarized piezoelectric particles, i.e., piezoelectric particles having polarization per se, even for complete components without using conductive additives and, in particular, without a precisely defined amount of conductive additives.
The present invention is explained in detail with reference to example embodiments illustrated in the examples and in the Figures.
REFERENCES:
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patent: 4921928 (1990-05-01), Tanino et al.
patent: 38 19 946 (1989-03-01), None
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patent: 00/31808 (2000-06-01), None
patent: WO 00/31808 (2000-06-01), None
Sumita et al, “New dampening materials composed of piezoelectric and electro-conductive, particle filled polymer composites: effect of the electromechanical coupling factor”, Makromol. Chem., Rapid Commun. 1991, 12, 657-661.*
DIN 53 440, Jan. 1984, “Testing of plastics and damped laminated systems: bending vibration test; general rudiments of dynamic elastic properties of bars and strips”.
DIN 53 440, Jan. 1984, “Testing of plastics and damped laminated systems; bending vibration test: determination of complex modulus of elasticity”.
S. Yarlagadda et al., “Resistively shunted piezocomposites for passive vibration damping”, American Institute of Aeronautics and Astronautics Conference, Apr. 16-19, 1996, pp. 1-10.
M. Sumita, et al., “New damping materials composed of piezoelectric and electro-conductive, particle-filled polymer commposites: effect of the electromechanical coupling factor”, Makromol. Chem., Rapid Commun., 12, pp. 657-661, Dec. 1991.
Borchers Ingo
Hartweg Martin
Michel Josef
Roitzheim Rolf-Dirc
Schnur Jürgen
Daimler-Chrysler AG
Kenyon & Kenyon
Kopec Mark
Vijayakumar Kallambella
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