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Random Fiber Composite

Random Fiber Composite
Piezo Cermaic Fibers


Considering a reduced acoustic impedance and high coupling factor, 1-3 random fiber composites have superior properties for ultrasound transduction. 1-3 fiber Piezo composites are prepared by epoxy infiltration of fiber bundles and dicing of the cube-shaped blocks perpendicular to the direction of the fibers. This patented method is also called Arrange & Fill. A random distribution of the fibers shows excellent suppression of lateral frequency modes. Using Piezo ceramic fibers with sizes  105µm, 250µm and 800µm yields fill factors of 35%, 65% and 80%.

Due to the production methods used, raw blocks of regular fiber Composite can be up to 10cm in length. These blocks can then be sliced into plates of a desired frequency or machined in to various specified shapes, including precise concave or convex contours.

Typical Applications:

  • Non Destructive Testing (NDT) Ultrasound Transducers 
  • Flow control
  • Ultrasonic Air Transducers
  • Single Element SONAR

1-3 Random Fiber Composite Specifications:

  • Resonance Frequencies from 40 kHz to 10 MHz
  • Frequency Tolerance ±10% standard, ±5% available
  • Available in PZT Navy type II and type VI
  • Maximum dimensions 6cm by 6cm (2.36" by 2.36")
  • Custom sizes and shapes available
  • Various epoxy and polyurethane interstitial materials available
  • Operational temperatures up to 130C
  • Electrode Material:
    • Copper-Tin for all Frequencies less than 5MHz
    • Silver-Gold electrodes for all frequencies above 5MHz or when requested
  • Mechanical tolerances
    • For dimensions < 6mm±0.1mm
    • For dimensions < 30mm±0.2mm
    • For dimensions ≥ 30mm±0.3mm

Standard Plate Sizes:

Navy Type II Plates
Fiber Size/Fill Dimensions (mm) Frequency
105µm/35% 30 x 30 3 to 10 MHz
  40 x 40 3 to 10 MHz
  50 x 50 3 to 6 MHz
  60 x 60 3 to 5 MHz
250µm/65% 40 x 40 200KHz to 5 MHz
  50 x 50 200KHz to 5 MHz
  60 x 60 200KHz to 5 MHz
800µm/80% 50 x 50 200KHz to 5 MHz
Navy Type VI Plates
Fiber Size/Fill Dimensions (mm) Frequency
105µm/35% 50 x 50 3 to 6 MHz
  60 x 60 3 to 5 MHz
250µm/65% 50 x 50 200KHz to 5 MHz
  60 x 60 200KHz to 5 MHz
800µm/80% 50 x 50 200KHz to 5 MHz

 

When Ordering or Requesting a Quote, specify the following characteristics

  • Composite Type
  • Material
  • Shape
  • Frequency
  • Fill%
  • Electrode Type