Piezoelectric Plates

Advanced Electro Ceramics

CeramTec is a world leader in the design and manufacture of complex electronic ceramic components and assemblies used in a wide range of applications and cutting edge technologies. CeramTec’s Global Electroceramics Divisions specialise in the development and production of various plate sizes, electrode and metallisation configurations.

This range is fabricated from 33 available piezoelectric material formulations to address high power, sensitivity, stability needs in cryogenic temperatures as also in high temperatures and extreme pressure applications.

 

Applications include
 
  • 1-3 Composites for SONAR and medical imaging
  • Megasonic cleaning
  • NDT transducers
  • Pressure sensors
  • Tactile feedback
  • Ultrasonic sensors
  • Linear ultrasonic motors
Features
  • Choice of metallisation (Silver, Nickel, Gold and others)
  • Evaporated and chemically deposited metallisation's available
  • Thickness frequency tuning available on request
  • Wide choice of PZT formulations

CeramTec is manufacturing what are believed to be the world’s thickest piezoelectric ceramic blocks. The blocks, designed for use in ultra- low frequency SONAR applications down to 18KHz, are made of high-quality, soft (Navy II) PZT5A1. The blocks offer superb electrical characteristics, are of high sintered density and come in a choice of nine, highly sensitive 'soft' PZT formulations suitable for the manufacture of wide bandwidth 1-3 composite transducers. However, the most striking feature of Morgan's new PZT ceramic blocks is their size, and in particular their thickness reaching a current maximum of 48mm. The ability to manufacture and polarise such large thicknesses of piezoelectric materials represents a step change in the industry.

Typical Electrode Configurations

Standard

Wrap Around

Custom

Other custom electrode configurations and metallisation’s are available on request.

Dimensional Range
  • Length from 1mm (0.04”) to 165mm (6.5”)
  • Width from 1mm (0.04”) to 165mm (6.5”)
  • Thickness from 0.08mm (0.003”) to 48mm (1.9”)

Parts can be produced to the size ranges shown, but not in every combination of dimensions expressed above.


Standard Mechanical Tolerances
  • Length & Width ± 0.150mm
  • Thickness ± 0.05mm
  • Squareness (edge to face): Within 0.15°
  • Flatness (lapped parts): 0.012mm (lapped), 0.015mm (sliced)
  • Parallelism: 0.012mm (lapped), 0.06mm (sliced)

Tighter mechanical tolerances are achievable but are dependent on the plate length, width and thickness. Wider mechanical tolerances are obtained on large plate components, more information is available on request.


Metallisation Type
  • Silver fired thick film - Evaporated Nickel
  • Electroless nickel - Gold flash
  • Tin - Evaporated Gold and others available on request
Typical Impedance Trace (Length Resonance)
Useful Equations

Capacitance

Static displacement

Planar coupling factor

Longitudinal or transversal frequency

Voltage (static)

Mechanical quality factor

Thickness frequency

Effective coupling factor

Ceramic Testing

Appropriate statistical methods ranging from AQL’s to 100% testing are used on electrical parameters in accordance with EN-50324-1. A brief summary is provided in hard copy and typically includes low field measurements of capacitance, tan delta and the main parameters used to determine piezoelectric activity. Procedures other than this can be negotiated, and additional data requirements (electronic format, sample quantity, etc) are available on request.