X-ray Fluorescence Analysis of Nickel-Base Heat-Resisting Alloys Using the Fundamental Parameter Method

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  • ファンダメンタル・パラメータ法によるニッケル基耐熱合金の蛍光X線分析
  • ファンダメンタル パラメータホウ ニ ヨル ニッケルキ タイネツ ゴウキン ノ

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Abstract

The fundamental parameter (FP)-XRF analysis of ten alloying elements (Al, Ti, Cr, Mn, Fe, Co, Zr, Nb, Mo and W) in nickel-base heat-resisting alloys was performed with the XRF-11 program.<BR>One nickel-base alloy for multi-elements calibration standard was prepared by a vacuum arc melting method. The homogeneity test of alloying elements in the disk standard was performed by spark emission spectrochemical analysis. Consequently, the disk standard could be used for the FP-XRF analysis calibration. The chemical composition of the calibration standard was determined by the wet chemical analyses and inductively coupled phsma atomic emission spectrometry after ion-exchange separation.<BR>The spectral line overlaps were examined. The correction coefficients for the spectral line overlaps, that is, mMn,Cr, mCo,Fe, mNb,Mo and mMo,Zr, were 0.0004, 0.0003, 0.0004 and 0.0030 respectively. The accuracies for the determination of alloying elements with the proposed method obtained from fifteen standard reference materials were almost equal to those obtained by the correction method using theoretical alpha coefficients. The relative standard deviations (RSD) of repetitive seven measurements for the analytical values of the ten alloying elements were within about 1.5% with the exception of those for manganese (Mn; 0.01%, RSD; 6.08%) and tungsten (W; 0.06%, RSD; 6.69%).

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