Views:1 Author:Site Editor Publish Time: 2018-12-12 Origin:Site
Many applications of piezoelectric ceramics in the precise instruments, including testing equipment, shock absorbing equipment and feeding equipment. In the application of these three aspects, various scholars have proposed different application methods. There are similarities and differences, and there are also different. The above examples of indiscriminate enumeration are that even if we can't learn from others, we should extract some experience of piezoelectric ceramics in the application of precision systems for future research. In terms of detection, there are two application methods for using a piezoelectric device as a sensor and a measuring device itself. Although the essence is the use of piezoelectric ceramic machine-electrical conversion, the requirements for piezoelectric ceramics are different. The former has requirements for the accuracy of the data to be transmitted, while the latter focuses on the measuring the accuracy of the data itself. In terms of shock absorption, the unified piezoelectric ceramics are used as active damping devices, and the mechanism is also a control-execution system with feedback system as the core. In terms of the feed system, the circuit diagram of piezoceramic actuator device appears as a transmission member and an active member on the instrument. The difference in accuracy between the two is indistinguishable, but the piezoelectric ceramic as the active component is undoubtedly more capable of exhibiting high sensitivity, low heat generation, high frequency response and no noise. But it is undeniable that piezoelectric ceramics still have many defects. For example, the toxic substances in piezo ceramic materials pollute the environment, and the nonlinearity, creep and hysteresis of the piezoelectric ceramic feedback signals are all problems that cannot be ignored in practical applications. In general, although people artificially divide piezoelectric ceramic components into various types such as vibrators, transducers, and sensors, this classification is not clearly reflected in the application. Both the transducer and the vibrator can be used to detect the device, but the way it is used is different. When is designing precise instruments using piezoelectric ceramics, the first thing to focus on is the direction of energy conversion. The positive and negative piezoelectric effect determines the choice of piezoelectric ceramic components. Second, we must pay attention to the requirements of parameters such as accuracy. This will determine the choice of the position of the Pzt piezo ceramic material component.
For the future development of piezoelectric ceramics crystal, it is undoubtedly described in terms of materials and structures. In terms of materials, the current progress has evolved from unit ceramics to multi-component ceramics, and has matured. The traditional piezoelectric ceramics are mainly PZT-based binary ternary ceramics, which have a series of excellent properties. These ceramic materials have made important contributions to the development of modern science and technology in the national economy. However, these PZT-based piezoelectric ceramics contain a large amount of lead. The content of PbO (or Pb3O4) accounts for about 70% of the total mass of the raw materials. These ceramics emit toxic substances during preparation, use and disposal. This is obviously contrary to Requirements for human development and environmental protection. The direct meaning of lead-free piezoelectric ceramics (or more generally referred to as environmentally-coordinated piezoelectric ceramics) is lead-free piezoelectric ceramics, the deeper meaning of which means both satisfactory performance and good environmental coordination. Piezoelectric Ceramics requires that the material system itself does not contain substances that may cause damage to the ecological environment. In the process of preparation, use and disposal, there is no substances harmful to the environment are produced, and the preparation process of the piezo electric plates has the characteristics of environmental coordination such as less energy consumption.