What are the advantages that magnetic materials bring to our lives?
The image of that material in vivo seems to have a unique "spring", can be induced by magnetic or electric, although it is very small elongation (micro or nano), but it can make the mare go. In addition to the electrostrictive effect, another effect that allows the mechanical and electrical energy to interact with each other is the piezoelectric effect. The piezoelectric effect, refers to some of the media does not exist due to internal symmetry, so under the action of force deformation caused by the surface of the medium, charged, called positive piezoelectric effect; on the other hand, applying excitation electric field, the medium will produce mechanical deformation, called inverse piezoelectric effect. This magical effect has been applied by scientists to many fields that are closely related to people's lives, in order to realize the functions of energy conversion, sensing, driving and frequency control. For example, the use of piezoelectric ceramics to transform external forces into electrical energy, can create a piezoelectric lighter, shell detonation device, the above gas stove ignition example is used in this ceramic. In addition, piezoelectric ceramics can be used as a sensitive material, such as the production of piezoelectric seismograph, slight vibration on human perception cannot monitor and accurately measure the range and intensity of earthquake, earthquake prediction so as to reduce the loss. Another example is the piezoelectric actuator based on piezoelectric effect, which can realize the function of precise control. It is an important device in the fields of precision machinery, micro electronics and biological engineering. It can be said that piezoelectric ceramics are not only widely used in high technology, but also "civilian", serving people's daily life, making them more convenient and comfortable.
Ceramics, together with metal materials and organic materials, form the basic materials for social development. The following table lists some examples of electronic products that come with the development of electronic ceramics. From this we can see the impetus of electronic ceramics for human progress. The effect of transistor radio barium titanate and ferrite sheet 1 with the development of electronic ceramic products and specific examples of the advent of electronic products the name of electronic ceramics in electronic technology plays the L and C components of miniaturization and portable equipment to increase prices and reduce the development of computer, ultra small rectangular loop ferrite materials and the memory element prompted industrial TV due to the development of ferrite yoke used, appeared with the development of the popularity of ferrite telephone communication cathode ray tube cheap civilian products, making the transmission device miniaturization and large capacity portable radio telephone line device of PZT piezoelectric ceramic development, makes the filter miniaturization, low power consumption miniaturization
The application of electronic ceramic case of every hue, we cannot enumerate, can only see only a small part". For example, the submarine sounding example mentioned at the beginning of the article is an electroacoustic transducer made of magnetostrictive material. By the external alternating magnetic field excitation, the magnetostrictive material will vibrate, the resulting acoustic wave; conversely, when the material deformation occurred in the acoustic pressure, the magnetic induction intensity inside the materials have great changes, so that the induced current in the coil. By using this effect, sound waves can be transmitted and received. In addition to magnetostriction, some materials have obvious electrostriction phenomenon, applied to the micro actuator and positioner, such as used in precision adjustment of length and angle in the optical system with high precision, the position control precision can reach nanometer level (10 to 10 meters).
