Piezo Ceremic Elements

A variety of Piezoceramic materials based on Lead Zirconate and Lead Titanate composition have been standardised for low power as well as high power applications. These materials can be tailormade to various shapes and sizes. To meet customer requirements, CEL's capability in the area of High Alumina is planned to be exploited to meet potential large volume requirements of substrates, bearings, bullet-proofing, etc.

Piezoelectric Ceramic Transducer Elements:

Central Electronics Ltd. has standardised a variety of piezoelectric ceramic materials based on Lead Zirconate and Lead Titanate compositions. These materials can be tailor-made to various shapes and dimensions to suit individual requirements. The Piezoelectric Ceramic 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.

The following different classes of piezoelectric ceramic materials are under production at CEL :

"PIEZOCEL - A" are used for low power systems and in other applications where the requirements of the ceramic materials calls for 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.

"PIEZOCEL - B" are used for high power applications where high electro-mechanical coupling co-efficient and low di-electric loses 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.

MATERIAL CHARACTERISTICS

		PIEZOCEL-A	PIEZOCEL-B
Physical Properties :
Density		7.6	7.5
Curie Temperature		320ºC	300ºC
Mech. Q		85	400
Dielectric Properties :
Dielectric Constant at 1KHz		1600	1100
Dissipation factor at 1KHz		0.02	0.005
Resistivity		1012	1012
Electro-Mechanical Data :
Coupling co-efficients	Kp	0.55	0.52
	K31	0.31	0.28
	K33	0.68	0.65
Piezoelectric charge constant (10-10coulombs/Newton)	d33	3.50	2.40
Piezoelectric voltage constant (10-10volts-meter/Newton)	g33	2.4	2.2
Frequency Constants :
Radial Mode (Hz-meter)		2000	2200
Thickness Mode (Hz-meter)		1800	1900

Piezoelectric Elements