Overview of Piezoelectric Ceramics

1.What is Piezoelectric Ceramics
2.Develop of Piezoelectric Ceramics
3.Characteristics of Piezoelectric Ceramics
4.Applications of Piezoelectric Ceramics
5.Conclusion

What is Piezoelectric Ceramics

Piezoelectric ceramics are special materials, which are able to convert mechanical energy into electrical energy and vice versa. They are pressed or vibrated, then they will produce electric charge. They somewhat deform when an electric field is applied. This unusual property is referred to as piezoelectric effect. They are found in sensors, actuators, buzzers, ultrasonic transducers and various other electronic appliances.

They are often made of such compounds as lead zirconate titanate (PZT), that provides powerful and stable piezoelectricity.

Develop of Piezoelectric Ceramics

French scientists Pierre and Jacques Curie brought the discovery of the piezoelectric effect in 1880. They found that some crystal types like the quartz and Rochelle salt produce electricity on compression. The performance of the effect was, however, curtailed by natural crystals. Only in the 1940s, scientists developed synthetic piezoelectric materials, in particular, ceramics were more powerful and less demanding. Lead Zirconate Titanate (PZT) was developed in the 1950s, that turned out to be the most common piezoelectric ceramic materials due to its great efficiency and flexibility. The piezoelectric ceramics are now part of the modern electronics and precision technology.

Characteristics of Piezoelectric Ceramics

• High Piezoelectric Sensitivity

Even under a low mechanical load, piezoelectric ceramics produce a high electrical signal. This qualifies them to be good precision sensors, microphones and vibration sensors.

• Reversible Conversion of Energy

These piezoelectric ceramics materials may be used in either direction and a mechanical load can generate electricity and electric input can cause mechanical movement. This functionality enables them to act as actuators as well as sensors.

• High Frequency Response

Piezoelectric ceramics respond rapidly to electrical or mechanical stimuli, so may be used in ultrasonic applications like medical imaging and industry inspection of flaws.

• Temperature Stability

Most forms of piezoelectric ceramics can maintain their performance over a large range of temperature, which has allowed their use in industrial and automotive applications.

• Adjustable Material Properties

Piezoelectric and dielectric properties of these ceramics can be adjusted either by changing the chemical composition or even through sintering. This allowance enables the manufacture to customise ceramics to individual performance specifications.

• Strength of Mechanical and Brittle

Although piezoelectric ceramics are brittle, hard and stiff, they can break in case of the presence of excessive mechanical stress or impact. It should be designed properly and handled carefully to prevent any damage.

Applications of Piezoelectric Ceramics

Piezoelectric ceramics are very essential in both the daily objects and the advanced technology. In medicine, they act as the core of ultrasound machines so that doctors can have a look into the body. They are used in microphones, speakers and buzzers in consumer gadgets. They assist in car control through regulation of the fuel injection, monitoring of vibrations. Piezoelectric ceramic can be also applied in industrial sensors, sonar, and devices that need precision positioning. Recently, there has been an effort by scientists to use piezoelectric ceramics in energy-harvesting-converting the vibrations present in the environment into electricity to power small gadgets.

Conclusion

Piezoelectric ceramics are outstanding materials, which connect the mechanical and electrical systems. They are able to feel, produce and regulate energy and this makes them very important in most industries. Since the scientists discovered crystals in nature, and the invention of the current structured ceramics, these materials have provided advancements in technology in many fields. Further studies will continue to increase their applications in intelligent devices, clean energy, and further development.

Looking for the suitable piezoelectric ceramic solutions for your application? Contact our team of engineers right now for advice and a quote.