The armor-piercing projectile it fired would explode immediately when it touched the tank, blowing the tank to pieces. In order to fight against tanks, an anti-tank gun was invented. For example, electronic music greeting cards convert AC audio signals into sound signals through the inverse piezoelectric effect. Piezoelectric ceramics can generate vibrations of different frequencies through the control of electronic circuits, thereby emitting various sounds. Piezoelectric ceramics can be used as sound transducers for pickups, microphones, headphones, buzzers, ultrasonic sounders, sonar, and ultrasonic flaw detectors for materials. ApplicationВ of Piezoelectric Ceramic Voice changer Positive piezoelectricity refers to the relative displacement of positive and negative charge centers in some dielectrics under the action of external mechanical force, resulting in polarization, which leads to the appearance of bound charges with opposite signs on the surfaces of the dielectrics. The biggest characteristic of piezoelectric ceramics is piezoelectricity, including positive piezoelectricity and inverse piezoelectricity. The elastic coefficient of piezoelectric ceramics is a parameter that reflects the relationship between the deformation of the ceramics and the applied force. The dielectric properties of piezoelectric ceramics reflect the degree of response of the ceramic material to an external electric field. CharacteristicsВ of Piezoelectric Ceramic Dielectricity At present, new breakthroughs have been made in the application of nanotechnology to the fabrication of piezoelectric materials.Д¬urrently, the world is developing lead-free piezoelectric ceramics to protect the environment and pursue health. In this way, the single-crystal materials of the iron and electric body were successfully developed, which laid a foundation for three-dimensional ultrasonic imaging. Since the late eighties, people have developed ceramic materials for ferroelectric ceramics.

Subsequently, Japan developed the application of BaTiO3 piezoelectric ceramic actively to make ultrasonic transducers, high-frequency transducers, pressure sensors, filters, resonators and other piezoelectric devices. In 1947, Roberts applied high pressure for polarization treatment on BaTiO3 ceramics and obtained the voltage of piezoelectric ceramics. The development of piezoelectric materials and their applications was attributed to the discovery of BaTiO3 ceramics in World War II. During World War I, CurieвЂ™s successor Langevin was the first to use the piezoelectric effect of quartz to make an underwater ultrasonic detector, which was used to detect submarines, thus opening the page of piezoelectric applications. Quartz is a representative of piezoelectric crystals and it has been applied. In 1894, Voigt pointed out that it was possible to have a piezoelectric effect on the crystals of the twenty-point groups of the asymmetrical center. In 1880, the Curie brothers first discovered the piezoelectric effect of tourmaline and began the history of piezoelectricity. With the continuous research and improvement of materials technology, and the rapid development of electronic, information, aerospace and other high-tech fields, the production technology and application development of piezoelectric ceramic with high intelligent materials has become a hot topic. as an important force, heat, electricity, light-sensitive functional material. With good mechanical and stable piezoelectric properties, piezoelectric ceramics have been widely used in sensors, theВ ultrasonic transducer, microdisplacement device,В and other electronic components, etc. Piezoelectric ceramic is the general designation of ferroelectric ceramics with a piezoelectric effect through the polarization treatment of polycrystals made by mixing oxide ( zirconia, lead oxide, titanium oxide, etc.) with high-temperature sintering and solid reaction.

Piezo definition