What are the uses of piezoelectric ceramics?

Piezoelectric ceramics have a wide range of uses. According to rough statistics, piezoelectric ceramics have at least 20 uses. Let us give just a few examples:

In recent years, a new type of electronic lighter sold by the gas company is made of the piezoelectric effect of piezoelectric ceramics. If some teenagers want to heat their own meals at noon, you must have "experience" in this regard: as long as you press the button on the lighter with your thumb, the piezoelectric ceramic will generate high voltage, form a spark discharge, and ignite the gas. When piezoelectric ceramics convert mechanical energy into electrical energy for discharge, the ceramic itself does not consume, has almost no wear, and can be used for a long time. Therefore, the piezoelectric lighter is easy to use, safe and reliable, and has a long life. According to a gas company salesperson, a piezoelectric lighter can be used more than 300,000 times. Based on 3,000 uses per year, it can be used for approximately 100 years.

Earthquakes, a natural phenomenon, have always seemed extremely ferocious and terrifying. There are approximately millions of earthquakes that occur on the earth every year, of which tens of thousands can be felt by humans, accounting for about 1%. Since the 20th century, there have been 10 devastating earthquakes, 4 of which occurred in China.

Once a major earthquake occurs, it will cause devastating disasters to mankind. Therefore, earthquake prediction is very important. Because the piezoelectric effect of piezoelectric ceramics is very sensitive, it can accurately measure subtle changes in the earth's crust, and can even detect air vibrations caused by the flapping wings of insects more than 10 meters away. Therefore, piezoelectric seismometers can accurately measure earthquake intensity. . Because piezoelectric ceramics can measure the propagation direction of sound waves, piezoelectric seismometers can also tell people the location and distance of earthquakes. With piezoelectric seismometers available to predict earthquakes, people can feel more at ease.

In the military, when people manufacture armor-piercing projectiles, they often install piezoelectric ceramics on the warhead. As soon as the armor-piercing projectile hits the tank, the explosive will be ignited by the high-voltage electricity generated by the piezoelectric ceramics and explode, blowing the tank to pieces.

In addition, through the positive piezoelectric effect, mechanical vibration is converted into alternating current signals, which can be used to manufacture piezoelectric pickups, speakers, buzzers, ultrasonic receiving probes, etc., among which electronic music greeting cards are such devices instance. On the contrary, through the inverse piezoelectric effect, the alternating current signal is converted into mechanical vibration, which can be used to manufacture ultrasonic transmitters, piezoelectric speakers, transmission devices for video recorders and audio recorders, and ultrasonic cleaning agents. In addition, many piezoelectric devices with high conversion efficiency and high sensitivity for transmitting and receiving sound waves are serving in ultrasonic underwater detectors, ultrasonic non-destructive detectors of materials, and detecting the size, type, density, orientation and location of fish schools in the ocean. Distance, submarine position underwater sonar, ultrasonic tomography device, high-power ultrasonic lithotripter and other instruments.

Piezoelectric ceramics have the characteristics of easy processing and molding, low cost, and easy control of piezoelectric properties. The scope of application is constantly expanding, and the prospects are immeasurable.