Views: 8 Author: Site Editor Publish Time: 2018-08-28 Origin: Site
Nowadays,piezo ceramics have been widely used in the electronics, chemical, military and other fields due to their high hardness,strengths, excellent corrosion resistance and insulating properties. As the compositions of piezo ceramics and raw materials are key factors to determine the performance, the real-time detection and control of the contents of ceramics and raw materials are very important to produce high performance ceramics. Traditional piezo ceramic
analysis methods cannot meet the requirement of rapid detection due to its complex procedures and time-consuming. In this thesis, laser probe technology was used to analyse the compositions of aluminum oxide ceramics and their raw materials due to the characteristics of fast, real-time and multielement.
Based on the self-developed laser probe machine, the compositions of aluminum oxide ceramics were analysed qualitatively. Eight kinds of main high intensity focused piezo and their characteristic spectral lines were identified at the atmosphere and experimental parameters were optimized.The results show that plasma signals with better S/N ratio below the sample surface,a pulse enegy can be obtained at a defocused distance of 3 mm , a time delay and a pressure of 1500 Pa in argon.
In additon, the spectral fines of Al0 free radical molecular are found during the interaction of laser with the aluminum oxide ceramics. The shape and evolution of pzt 5a material piezo ceramic with time delay and energy causes were discussed, which provides references of other molecular spectral lines by laser probe.
Finally,piezo elements of Mg、K, Ca, Fe、Na and Ti of raw materials ultrasonic wired ceramic discs were quantitative analysed by laser probe based on internal calibration method. The results show that all the linearly dependent coefficients of calibration curves reach 0.94mm. Furthermore, the spectral intensity, stability and linear correlation is coefficient of calibration curves which are all improved technology,to some extent ,after heating the standard sample. Importantly, laser probe has the same analysis level as the EDXRF (Energy Dispersive X-Ray Fluorescence) but it is inferior to the chemical analysis method. Especially for the main ceramic elements of Mg, K and Ca, the detection accuracy of laser probe is better than that of EDXRF.
Laser probe technology, laser-induced broken spectroscopy (Laser-Induced breakdown spectroscopy,LIES technology is named for its many similarities in the principle with electronic probe analyzers. The basic principle is a high density piezoelectric materials acoustic piezometer is used to excite the analyte, generate a plasma, and use a spectrometer to plasma.The energy transition characteristic spectra of atoms and ions in the body are analyzed, and the analysis methods of the types and contents of each piezo element are obtained.In 1962, Brech first reported the possibility of laser probes for the determination of elemental contents in the gases, liquids and solids in the decades that followed, this technique has been the focus of attention as a new type of measurement method.
