Conventional piezoelectric ceramics
The piezoelectric ceramic element is an electronic pronunciation, two sheets of copper in the middle of the circular electrode in the piezoelectric ceramic dielectric material, when the above two pieces of the electrodes connected to AC audio signal, a piezoelectric sheet size according to the frequency of the signal to produce the corresponding sound vibration occurs. Piezoelectric ceramics because of its low cost structure is simple, is widely used in electrical and electronic aspects such as: toys, pronunciation electronic watches, electronic equipment, electronic watches and clocks, timers and so on.
Have thinner and smaller chip size piezoelectric ceramic frequency components; higher frequency piezoelectric ceramic resonator; higher frequency accuracy, superior frequency stability, higher reliability piezoelectric ceramic frequency components; has excellent heat resistance, can be applied to the required lead-free reflow chip ceramic frequency components; application will contain less toxic and harmful elements in chip piezoelectric ceramic frequency components of attention.
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In the 1980s, with the development of China's electronic industry and civilian needs, the demand for household appliances ceramic filters and ceramic resonators rapid increase in Jingdezhen in Jiangxi Province and Shanghai radio factory 999 while the introduction of a plant in Japan Murata piezoelectric ceramic frequency component production line, pulled from our piezoelectric ceramic products from a large number of military into civilian production prologue.
Conventional piezoelectric ceramic piezoelectric effect of the piezoelectric material other than the type is stronger, and thus has been widely used. But as big should edge, high-energy transducer materials, piezoelectric effect of piezoelectric ceramics tradition still can not meet the requirements. So in recent years, people in order to come up with a more excellent piezoelectric properties of a new piezoelectric material, a lot of work, has been discovered and developed PbPbTiO3 crystal. Such single crystal d33 up 2600pc / N, k33 can be up to 0.95, the strain> 1.7%, than the piezoelectric ceramics is almost an order of magnitude of strain.
Costs now make fine-grained material can already compete with the ordinary ceramics. In recent years, piezoelectric ceramics with fine grain abrasive cutting study and produce a number of high-frequency transducers, micro-brakes and thin buzzer, proves the superiority of fine crystal grains of the piezoelectric ceramics. With the development of nanotechnology, fine grain piezoelectric ceramic materials research and application development is still a recent hot.
