Determination of tungsten, cobalt, nickel, iron, niobium, tantalum and chromium in hard alloy by X-ray fluorescence spectrometry with fusion sample preparation
PENG Hui-xian
PanGang Group Research Institute Co.,Ltd., State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China
Abstract：The single oxide fusion fine powders were prepared with high-purity oxides using lithium tetraborate and lithium carbonate as flux. The fine powders with different masses were mixed and fused to synthesize the artificial standard samples of hard alloy with different elemental contents. The calibration curves were prepared. The matrix effect was corrected with empirical coefficient method. The analysis method of cobalt, nickel, iron, niobium, tantalum, chromium and tungsten in tungsten-cobalt or tungsten-nickel tungsten-based hard alloys by X-ray fluorescence spectrometry (XRF) without certified standard samples was established. The linear range of calibration curve of elements was wide. The correlation coefficients were all higher than 0.998. The precision test was conducted on the artificially prepared standard samples with the relative standard deviation (RSD) of less than 0.5%. The determination precision of hard alloy samples was investigated and the results were good. The accuracy test indicated that the determination results were consistent with those obtained by GB/T 26050-2010 and chemical method. The proposed method solved the problems of lack of certified reference materials of hard alloy.
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