List of Typical DCPL-5 Application

 
Ultrasonic Flaw Detection : DCPL-5 discs and plates are used as the active elements of many types of flaw detection probes and thickness gauges. Thickness frequencies are available for these shapes in standard sizes between 150 KHz and 8 MHz.
 

Pressure Gauges : A very wide range of DCPL-5 discs and plates are used for a variety of dynamic pressure gauge applications.

 

Strain & Excitation Gauges : Small DCPL ceramic plates are available with wrap around electrodes for use as strain gauges or strain excitation gauges. DCPL gauges are particularly useful for determining the natural resonance of structures, and therefore can be used to maintain tuning forks for low frequency standards.

 

Accelerometers : DCPL-5 discs and rings may be used as the active elements of accelerometers, the particular shape used depending on characteristics required.

 

Medical Electronics : DCPL-5 discs and plates in different sizes and frequencies are used in a variety of medical equipments like Foetal Monitors, Diathermy units, Ultrasound equipments.

 

Armament Fuses : DCPL-5 discs and cylinders are being used in various types of armament fuses, where the piezo acts as an ignitor.

 

List of Typical DCPL-4 Application

 
DCPL-4 rings in sizes 50.8mm & 38.1mm are being used for Ultrasonic Cleaners, Ultrasonic Drilling Machines.
 

Smaller rings are being used in Ultrasonic Dental Scalars.

 

DCPL-4 discs are being used in Beauty devices & Therapy equipments.

 

Use of Adhesives for Mounting PZT Ceramics

When PZT ceramic unit must be bonded to metal, other ceramic material, etc.; the use of epoxy resins such as the “Araldite” range is recommended. The fired on silver electrode presents an ideal surface for bonding, and only needs degreasing with a solvent such as trichloroethylene. If an electrically conducting resin is required, then conductive silver epoxy adhesive is recommended.

 
 

Piezo electric ceramics are commonly supplied with silver electrodes the are fused onto the surface at high temperature. Electrode thickness is .0006” to .001” and the adhesion strength is typically 3000-3500 psi. The electrodes normally cover the full surfaces to the edge of the ceramic, but may be specified with margins, wrap around. Leads can be attached by soldering, and the following procedure is recommended:

Clean the electrode surface to be soldered by light abrasion with a common pencil eraser to remove silver oxides. Tin the lead with Sn-62 solder (62% tin, 36% lead, and 2% silver). Dip the pre tinned lead into a mild non-corrosive flux. Melt a small quantity of the Sn-62 solder on the small tip of a soldering iron of approx. 30 watts. Position the lead on the electrode area and press down with the soldering iron tip until the solder flows onto the electrode. Keep the duration of soldering time to a minimum (< 5 sec) to prevent excessive alloying of the silver electrode onto the solder.

 
Soldering Method
 

•  Preheat soldering iron for about 10 -15 minutes.

•  The electrode surface should be made free from dust oil or grease and mildly abraded with a fine abrasive     paper.

•  Flux both ceramic silver and the test wire.

•  Pretin the ceramic area and the wire avoiding excessive flow of the solder. Place the wire in the electrode     area with mild pressure and start heating the lead wire about 2-3 mm above the silver electrode until the     solder flows onto the surface. Hold lead stationary for about 5 seconds to allow the solder to solidify.
    It would be preferred to make electrical contact at the vibration mode in the resonant devices. In some     applications, pressure contact may serve the purpose.