Ultrasonic piezoelectric ceramic
Ultrasonic piezoelectric ceramic semiconductor materials In ceramics, there are many semiconductors. The property of resistance changing with temperature can be used for non-linear resistance. Negative temperature coefficient nonlinear resistors (NTC nonlinear resistors) decrease in resistance as the temperature rises, and have general semiconductor characteristics. Iron-based metal oxide ceramics are chemically and thermally stable, so they can be used for non-linear resistors to control the temperature in a wide range. On the contrary, the component called PTC thermistor (PTC thermistor) uses semiconductorized BaTiO3 ceramics. This kind of ceramic has a sharp increase in resistance at the phase transition temperature. If it is used as a resistance heating element, it can automatically control the temperature around the phase transition temperature, which is very convenient.
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