A variety of Piezo ceramics materials based on Lead Zirconate Titanate composition have been standardized for low power as well as high power applications. These materials can be tailor made to various shapes and sizes. To meet customer requirements, CEL's capability in the area of High Alumina up to 99% is planned to be exploited to meet potential large volume requirements of substrates, bearings, bulletproofing etc.

Piezoelectric Ceramics Transducer Elements:

Central Electronics Ltd. has standardized a variety of piezoelectric ceramic materials based on Lead Zirconate Titanate compositions, these materials can be tailor-made to various shapes and dimensions to suit individual requirements. The piezoelectric Ceramics Elements made by CEL are already in use in the industry, research institutions and defence establishments.

The major advantage of piezoelectric ceramic bodies is that they have a high electrical to mechanical or vice versa conversion efficiency, Which makes it a versatile material for a variety of transducer applications.

PZT-A is used for low power systems and in other applications where is required high di-electric constant, high voltage sensitivity, volume resistivity and stability over a wide temperature range. It is most suitable for making the low power transducers, acoustic sensing elements, flaw detection probes etc.

PZT-B is used for high power applications where high electro-m3echanical coupling co-efficient and low di-electric losses under high driving field and a high coercive field are essential. This accepts more AC driving field without depoling and is ideally suited for high power electro-acoustic devices, ultrasonic cleaners, high voltage generators, high power sonar, etc.

PZT-C is again used for high power applications. It is an excellent choice when the highest electrical drive is required. Due to its excellent dielectric stability and low mechanical loss at high drive conditions it is used for ultrasonic welding, ultrasonic mixing/dispersion, ultrasonic surgery and some chemistry etc.

PZT-5J is used for low power applications where high permittivity and a high piezo electric voltage constant required. This material is used in fuses, hydrophones and other applications that require a combination of high energy and high voltage output.

PZT 5H is again used for low power applications where extremely high permittivity, coupling co-efficient and piezoelectric charge constant required. It is an excellent material for field flow sensors, level sensors, ultrasonic NDT applications and material imaging applications

MATERIAL CHARACTERISTICS

A PHYSICAL PROPERTIES * SYMBOL PZT -A PZT-B PZT-C PZT-5H PZT-5J PZT-5C 1 Density gm/cc r 7.6 7.5 7.6 7.4 7.5 7.6 2 Curie Temperature Tc. 320 C 300 C 300 C 210 C 225 C 180 3 Mech. Q Qm 85 400 1000 70 70 60 B DIELECTRIC PROPERTIES:             1 Dielectric Constant at 1 KHz K3t 1600 1250 1000 3250 2600 4200 2 Dissipation factor at 1 KHz D.F. 0.02 0.005 0.004 .02 .02 .02 3 Resistivity W.cm 10 12 10 12 C ELECTRO-MECHNICAL DATA:           1 Coupling co-efficient kp 0.55 0.52 0.51 0.56 0.62 0.65 K31 0.31 0.28 0.30 0.34 0.37  0.40 K33 0.68 0.65 0.60 0.68 0.72 0.70 2 Piezoelectric Charge constant (10 12 Coulombs/Newton) d33 3.50 2.40 225 580 480 700 3 Piezoelectric voltage constant  (10 -3 volts -meter/Newton) g33 25 22 25.4 20 20 17.4 D FREQUENCY CONSTANTS: 1 Radial Mode (Hz -meter) Np 2000 2200 2340 2000 - 1980 2 Thickness Mode (Hz-meter) N3T 1800 1900 2070 1950 1980 1890

* These typical values are provided for design information only.
Standard tolerances are +/- 20% of these values measured after 24 hours of Polarization at 25oC.

Piezoelectric Elements

• Circular Discs of different diameters to a maximum of 100 cm and thickness upto 15 mm can be supplied.
• Frequency Discs available upto 10 MHz
• Square plates.
• Cylinders and Rings.
• Piezoelectric elements for gas ignition.
• Transducer plates for Electronic Buzzers, Alarms, etc./
  
  Please mail us for any customized products.