13-09-2017, 04:09 PM
Piezoelectric effect was discovered by Jacques and Pierre Curie in 1888. Direct piezoelectric effect is the ability of some materials to create an electrical potential in response to applied mechanical stress. The applied voltage changes the polarization density within the volume of the material leading to the observed potential. As a requirement, only materials with non-centrosymmetric crystal structure may exhibit a piezoelectric effect. Some of the commonly used piezoelectric materials are quartz, zinc oxide, polyvinylidene fluoride and lead zirconate titanate, or Pb.
Piezo-ceramic materials are classified as functional ceramics. In the sensors make it possible to convert forces, pressures and accelerations into electrical signals, and sonic and ultrasonic transducers and actuators convert electrical voltages into vibrations or deformations. The piezo-ceramic materials are classified according to their chemical composition, on the one hand, and by the specific conditions of application, on the other. CeramTec distinguishes between the following categories of materials:
• Materials for power transducers (ultrasonic applications)
• Materials for sensors (ultrasonic transmitters and receivers)
• Materials for actuators (precision positioning or injection systems)
• Materials for special applications
Piezo-ceramic materials are classified as functional ceramics. In the sensors make it possible to convert forces, pressures and accelerations into electrical signals, and sonic and ultrasonic transducers and actuators convert electrical voltages into vibrations or deformations. The piezo-ceramic materials are classified according to their chemical composition, on the one hand, and by the specific conditions of application, on the other. CeramTec distinguishes between the following categories of materials:
• Materials for power transducers (ultrasonic applications)
• Materials for sensors (ultrasonic transmitters and receivers)
• Materials for actuators (precision positioning or injection systems)
• Materials for special applications