The Study Of Ferroalloy Plasma Characteristics Of Time And Space

Ferroalloy ’s component is real-time monitoring in the process of ferroalloy smelting. In particular, the change of non-metal carbon is very important to ferroalloy. It has important for the smelting process, improving production efficiency and quality of product. Laser induced breakdown spectroscopy(LIBS) is using the laser inducing plasma which it can generate spectral lines. Chemical group is analyzed according to a specific spectral signal that is determined by the element in plasma. The LIBS application can be carried out without sample processing; the physical state of the sample does not affect the LIBS applications, non-destructive testing and rapid analysis can be done. In recent years, LIBS has been in the metallurgical industry tentative engineering applications. The LIBS now has the shortcomings of weak stability and poor reproducibility, it has the shortcomings of weak stability and poor reproducibility, and especially it is difficult to measure the content of carbon element in the process of ferroalloy smelting. The problem is solved mainly by optimizing the measuring conditions and improving the accuracy of the equipment. This process ignores the spectral information by plasma radiation, and plasma is a complex nonlinear process. The plasma properties are related to the laser, buffer gas, and the physical and chemical characteristics of the sample.This article first studied the process of the laser interaction with target body and plasma generating evolution. The non uniformity of the plasma time space was found. From the analysis of the structure of the plasma in a plasma generation to the demise,the physical mechanism of the spectral line is analyzed, and the method of plasma diagnosis is proposed, and the calculation method of the plasma density and the plasma temperature is studied. Secondly, the spatial and temporal characteristics of laser induced solid state and liquid iron alloys are studied. The plasma time and space resolved spectra of the induced Fe alloy are measured by experiments. The spatial and temporal characteristics of the signal to noise ratio of the characteristic spectrum of the carbon element are analyzed in the plasma of the iron alloy. The temporal and spatial distributions of electron density and electron temperature in the plasma of alloy are studied. At the same time, the electron density and temperature of the solid iron alloy and the liquid iron alloy plasma are analyzed, and the difference was analyzed. And the differences are analyzed to provide guidance for the metallurgical online monitoring. Finally, the impact of self-absorption spectrometry effect is analyzed. The evolution characteristics of the temporal and spatial distribution of the plasma self-absorption effect are studied in order to provide an experimental guide for the measurement of the non metallic carbon in LIBS iron alloy. The best observation time and the observation position, as well as the impact of factors, are obtained, ultimately results provide the guidance for the engineering application. At last, the work is summarized and the prospect is presented.