Piezoceramic Tubes

For ultra-precise positioning applications.

EBL uses a proprietary machining process to frabricate tubes. Starting with fired ceramic, we machine, length grind, electrode, and polarize each tube to exacting tolerances. Although machining is more costly than extruding, pressing, or other bulk processing methods, only machined tubes like ours can meet the stringent requirements of wall thickness uniformity, straightness, and concentricity for all precision applications. Moreover we will machine to virtually any geometry, which you require.

EBL's tube actuators are available with four different electrode types, electroless nickel, our most popular electrode, gives a superior combination of thinness, uniformity, durability, corrosion resistance, and adhesion. The addition of a thin layer of gold over electroless nickel improves solderability and conductivity. Electroless copper is recommended for high magnetic field environments. Fired silver gives good conductivity and is nonmagnetic. Compared with electroless nickel, however, fired silver has a number of significant drawbacks: greater electrode thickness, greater thickness variability, and the mechanical distortion the tubes can undergo, when exposed to the high temperatures required for the silver firing process.

Piezoceramic Tubes


The values below are nominal. Thermal data are compiled from a variety of sources and are provided for convenience only. Hysteresis is a complex property for which no hard data exists. Generally, however, hysteresis decreases with increasing mechanical Q.

Material Properties EBL #1 EBL #2 EBL #3 EBL #4 EBL #9
Industry Types PZT-4 PZT-5A PZT-5H PZT-8 PZT-4D
EC-64 EC-65 EC-76 EC-69 ---
Navy Type I II VI III ---
d31Å/V@293°K -1.27 -1.73 -2.62 -.95 -1.35
d33Å/V@293°K 2.95 3.80 5.83 2.20 3.15
d31Å/V@4.2°K --- -0.31 -0.33 --- ---
d33Å/V@4.2°K --- 0.69 0.74 --- ---
Dielectric constant KT3 1300 1725 3450 1050 1450
AC depoling field kV/cm rms 10 7 4 15 10
Young's modulus 1010 N/m2 8.1 6.3 6.3 8.5 7.5
Curie Temperature °C 320 350 190 300 320
Thermal Conductivity W/m°C 2.1 1.5 1.5 2.1 2.1
Thermal expansion coefficient ppm/°C --- --- 4.7 3.0 ---
Density g/cm3 7.5 7.5 7.45 7.5 7.6
Mechanical Q 400 100 65 960 600
Poisson's ratio 0.31 0.31 0.31 0.31 0.31
Polarization: OD positive, OD negative on special request.
Standard Tolerances:
  • OD: +/- .002"
  • Length: +/- .003"
  • Wall Thickness: +/- .001", except +/- .002" for 0.125" OD tubes longer than 0.5"
  • Eccentricity: .002" max, except .004" max for 0.125" OD tubes longer than 0.5"
Example Dimensions:
  • OD: 0.125", 0.25", 0.375", 0.5", 0.75", or 1.00"
  • Length: up to 1.25" for 0.125" OD, up to 3.0" for all other ODs
  • Wall Thickness: 0.01" to 0.023" for 0.125" OD, 0.01 to 0.04" for all other ODs
Electrode Types: Nickel, Gold, Copper, or Silver
(Silver not available for tubes with IDs > 0.20")
Electrode Options:
  • Single or double wrap tabs
  • Axial segmenting (such as four 90° quadrants on the OD & ID)
  • Circumferential Bands
  • Electrode removal at the tube ends
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