Ceramic Piezoelectric Materials Piezoelectric elements can convert electrical and mechanical signals. Piezoelectric ceramic elements of a certain shape are mainly made by sintering PbTiO3-PbZrO3 system (PZT). Even if it is a sintered body, the piezoelectricity of a single crystal can be obtained by polarization. The main uses of piezoelectric components are spark plugs and resonators. The resonator acts as a radio wave filter that selectively passes a specific frequency, and is an indispensable component of a tuning circuit such as television (TV) and radio.
Ceramic semiconductor materials In ceramics, there are many semiconductors. The property of resistance changing with temperature can be used for nonlinear resistance. Negative temperature coefficient non-linear resistors (NTC non-linear resistors) decrease in resistance with increasing temperature, and have general semiconductor characteristics. Iron-based metal oxide ceramics are chemically and thermally stable, so they can be used in non-linear resistors to control temperature in a wide range. In contrast to this, the component called a positive temperature coefficient thermistor (PTC thermistor) uses semiconductorized BaTiO3 ceramics. This kind of ceramic has a sharp increase in resistance at the phase transition temperature. If used as a resistance heating element, it can automatically control the temperature around the phase transition temperature, which is very convenient.
When voltage is applied to piezoelectric ceramics, mechanical deformation will occur with changes in voltage and frequency. On the other hand, when the piezoelectric ceramic is vibrated, an electric charge is generated. Using this principle, when an electrical signal is applied to a vibrator consisting of two piezoelectric ceramics or a piezoelectric ceramic and a metal sheet, so-called bimorph element, ultrasonic waves will be emitted due to bending vibration. On the contrary, when ultrasonic vibration is applied to the piezoelectric bimorph element, an electrical signal is generated. Based on the above effects, piezoelectric ceramics can be used as ultrasonic sensors.
Piezoelectric ceramic wafer is a simple and lightweight electrical device. It is widely used because of its high sensitivity, no magnetic field spreading, no copper wire and magnet, low cost, low power consumption, and easy mass production. Suitable for the transmission and reception of ultrasonic and infrasonic waves, a relatively large area of piezoelectric ceramics can also be used to detect pressure and vibration. The working principle is to use the reversibility of the piezoelectric effect to apply audio voltage on it to emit sound.
Piezoelectric ceramics are functional ceramic materials that can mutually convert mechanical energy and electrical energy, and belong to inorganic non-metallic materials. At the same time, it has a positive and negative piezoelectric effect. The piezoelectric ceramic wafers produced by Changzhou Ultrasonic Electronics Co., Ltd. are mainly used in the fields of ultrasonic probes, ultrasonic medical treatment, ultrasonic flow meters, and automatic control. With outstanding performance and complete specifications, PZT piezoelectric wafers and new composite piezoelectric wafers can meet different types of needs.
Application of piezoelectric ceramic
1. ultrasonic cleaning trasnducer
2. ultrasonic welding tansducer
3. ultrasonic beauty transducer
4. ultrasonic underwater transducer
5. ultrasonic immersible transucer
6. ultrasonic screening transducer
7. ultrasonic cutting transducer
8. ultrasonic atomization transducer
9. ultrasonic emulsifier
Electromechanical coupling coefficient
Piezoelectric voltage coefficient
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