Piezoelectrics and related devices from ceramics dispersed in polymers
US5951908A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1998 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Jan 7, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/092
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.