The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 14, 1999
Filed:
Jan. 07, 1998
Changxing Cui, Bethesda, MD (US);
Ray Henry Baughman, Morris Plains, NJ (US);
Zafar Iqbal, Morristown, NJ (US);
Theodore Robert Kazmar, Santa Clarita, CA (US);
David Keith Dahlstrom, Panorma, CA (US);
Alliedsignal Inc., Morristown, NJ (US);
Abstract
This invention relates to compositions and processes for the fabrication of piezoelectric composites having improved figures of merit for both sensor and non-sensor applications. These composites comprise piezoelectric particles embedded in a polymer matrix. The improvements of this invention result from discoveries of the effects of polymer bulk compliance, polymer anisotropy, polymer melt index, and polymer/ceramic wettability on performance. The loss corrected figure of merit (g.sub.h d.sub.h /tan.delta.) obtained for the 0-3 composites is as high as 10.5.times.10.sup.-10 m.sup.2 /N, which is about four times higher than previously published for 0-3 composites of the prior art. Methods are described for the introduction of anisotropy into ceramic particle/polymer composites, so that cancellation effects that degrade the piezoelectric properties of composites can be reduced.