Quantitative Analysis Of Elements In Alloys Based On Calibration-free Laser-induced Breakdown Spectroscopy

The chemical composition of alloys directly determines their mechanical behaviors and application fields.Accurate and rapid analysis of both major and minor elements in alloys plays a key role in metallurgy quality control and material classification processes.Conventional techniques up to now on the alloy com-position analysis mainly include Chemical analysis,x-ray fluorescence spectroscopy,and flame atomic absorption spectrometry.The traditional analysis methods are cumbersome and time-consuming operation.So,these methods cannot feedback the content of all the elements in the alloy in time and cannot guide the application and production of the alloys well.Laser induced breakdown spectroscopy(LIBS)is a new kind laser ablation spectrum analysis technology.Although LIBS has been recognized as a prospective tool due to its many advantages,this method needs a lot of standard samples and is low efficiency because of the matrix effect.In this paper,a quantitative calibration-free laser-induced breakdown spectroscopy(CF-LIBS)analysis method,which carries out combined correction of plasma temperature and spectral intensity by using a secondorder iterative algorithm and two boundary standard samples,is proposed to realize accurate composition measurements.Experimental results show that,compared to conventional CF-LIBS analysis,the relative errors for major elements Cu and Zn and minor element Pb in the copper-lead alloys has been reduced from 12%,26% and 32% to 1.8%,2.7% and 13.4%,respectively.The measurement accuracy for all elements has been improved substantially.In this paper,we describe the importance of alloy testing,Conventional techniques firstly and introduce CF-LIBS.Then describe the theory and principle of quantitative analysis of CF-LIBS.Some parameters of CF-LIBS are confirmed.Finally,we develop a method which can accurately determine plasma temperature and spectral intensity and we have a quantitative analysis of the alloy by this method and the results indicate that the approach proposed here is both computationally feasible and successful.