Determination of tantalum,silicon,iron,aluminum,titanium and copper in niobium-tungsten alloy by inductively coupled plasma atomic emission spectrometry
1. Ningxia Orient Tantalum Industry Co.,Ltd.,Shizuishan 753000,China; 2. State Key Laboratory of Special Rare Meterial,Northwest Rare Metal Materials Research Institute Ningxia Co.,Ltd.,Shizuishan 753000,China; 3. National Engineering Research Center of Tantalum and Niobium,Shizuishan 753000,China
Abstract：The niobium-tungsten alloy has become the first-choice material for the high-temperature components of the new-generation aerospace vehicle engine.The accurate determination of its chemical composition has guiding significance for the research of material processing technology and material properties.The sample was dissolved with hydrofluoric acid and nitric acid.Ta 240.063 nm,Si 250.690 nm,Fe 238.204 nm,Al 394.403 nm,Ti 336.121 nm and Cu 219.226 nm were selected as the analytical lines.The calibration curves were prepared by matrix matching method to eliminate the influence of matrix effect.The determination method of tantalum,silicon,iron,aluminum,titanium and copper in niobium-tungsten alloy by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established.When the mass fraction of tantalum was 0.010%-0.60%,and the mass fractions of silicon,iron,aluminum,titanium and copper were in range of 0.005 0%-0.10%,the linear correlation coefficients of calibration curves were above 0.999 5.The limits of detection of elements were in range of 0.001 12%-0.023 3% (mass fraction).The proposed method was applied for the determination of tantalum,silicon,iron,aluminum,titanium and copper in niobium-tungsten alloy,and the relative standard deviations (RSD,n=11) were not more than 4.4%.The recoveries were between 97% and 104%.The experimental method was applied for the determination of tantalum,silicon,iron,aluminum,titanium and copper in certified reference material of niobium-tungsten alloy.The found results were consistent with the certified values.The analytical errors were within the allowed range in the laboratory.
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