Piezoelectric Tubes

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 Division specialises in the development and production of various rings sizes, bearing variety of electrode and metallisation configurations.

This variety of tubes is fabricated from 33 published and additional custom in-house piezoelectric material formulations to address needs such as high power, sensitivity, stability in cryogenic temperatures as also in high temperatures and extreme pressure imposing applications.

 

Applications include
 
  • Hydrophones
  • Fibre optic stretcher
  • Augmented reality
  • Torpedo decoys
  • Accelerometers
  • Pressure sensors
  • Print head transducers
  • Oil and gas exploration
  • Scientific equipment
Features
  • Choice of metallisation (Silver, Nickel, Gold and others)
  • Evaporated and chemically deposited metallisation's available
  • Thickness/Radial frequency tuning available on request
  • Wrap around electrode configuration
  • Wide choice of PZT formulations

CeramTec offers a wide range of striped tubes for the defence sector with an innovative design, offering lower frequency and increased drive for applications where high acoustic transmitting properties are required. Ideal for a variety of defence uses including anti-submarine warfare, torpedo decoy and countermeasure, the striped tubing can achieve typical frequencies of 12–15 kHz for a two inch tube and guarantees higher, stronger acoustic signals underwater. In contrast to a standard tube, which has three main resonance modes (length, wall and circumferential), striped tubes have one main resonance – the circumferential mode.

Typical Electrode Configurations

Tube with
plain electrodes

Tube with split electrodes
on outside diameter

Tube with
striped electrodes

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

Dimensional Range
  • Outside Diameter - from 0.4mm (0.016”) to 150mm (5.9”)
  • Inside Diameter - from 0.2mm (0.0079”) to 140mm (5.5”)
  • Length - from 1mm (0.04”) to 150mm (5.9”)

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


Standard Mechanical Tolerances
  • Outside Diameter ±0.150mm
  • Inside Diameter ±0.150mm
  • Length ±0.05mm

Tighter mechanical tolerances are achievable but are dependent on the inside and outside diameters as well as length.


Metallisation Type
  • Silver fired thick film - Evaporated Nickel
  • Electroless nickel - Gold flash
  • Tin - Evaporated Gold and others available on request
Total Impedance Response Trace (Radial Resonance)
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.

Useful Equations

Capacitance

Circumferential frequency

Effective coupling factor

Length frequency

Static displacement

Planar coupling factor

Wall thickness frequency

Voltage (static)

Mechanical quality factor