Quantitative Analysis Of Laser Induced Nickel Base Alloy Plasma Spectrum

Because the content of the element in the alloy determines the properties of the material,online detection of alloy content is of great importance for controlling the quality of the product in the production process.Laser Induced Plasma Spectroscopy(LIPS)compared with the common detection methods such as Inductively Coupled Plasma Atomic Emission Spectrometry(ICP-AES),Atomic Absorption Spectrometry(AAS),Atomic Fluorescence Spectrometry(AFS)is a unique detection technique,which has advantages of rapid,on-line,remote-detectable and sample-less,and has been widely used in many fields.Because of the influence of many factors and the extremely complex interaction between laser and matter,the repeatability of the LIPS spectral signal and the accuracy of LIPS quantitative analysis results are greatly affected.In this paper,Ni-based alloy was taken as the research object.To evaluate the influence of controllable factors such as ambient temperature and sample temperature on the final data,a laboratory LIPS system was designed to realize the effective collection of spectral signals.At the same time,new qualitative analysis methods and quantitative analysis methods have been proposed and obtained good qualitative and quantitative results respectively.The main contents of this paper are as follows:(1)In order to analyze the influence of controllable factors,such as the atmosphere of LIPS experiment and sample temperature,the laboratory LIPS system was designed based on the existing magnetron sputtering instrument.(2)A qualitative analysis method was put forward to analyze the spectral data and identify all kinds of elements existing in the Ni-based alloy.The identified elemental spectrum has 290 peaks.(3)In this paper,the external standard method was firstly used to evaluate the contents of five elements(Cr,Ti,Ni,Al and Mo)in Ni-based alloy samples by selecting the appropriate quantitative analysis of the line with the relative standard deviation(RSD value).The results showed that the accuracy of the elements Ti and Ni was poor due to the indefinite factors such as matrix effect.After that,the minimum relative errors for predicting the contents of Ti and Ni using the proposed multi-element internal standard quantitative analysis were 2.45% and 2.28%,respectively.Compared with the external standard method,we can see that the accuracy of elemental content prediction by multi-element internal standard method is obviously improved.