Niobium tungsten (Nb521) alloy (Nb-5W-2Mo-1Zr) is a new type of high-temperature alloy material. Its excellent high-temperature mechanical properties, process properties, and high-temperature high-strength low-density characteristics make it widely used in aerospace technology . Chemical analysis method for the determination of W, Mo, and Zr elements in niobium-tungsten alloys not only has a long process and low analysis efficiency, but also has high cost and labor intensity. The ICP method takes into account the element content in the sample, the sample dilution factor is high, and the error is difficult to control The linearity of the curve is unstable, resulting in large fluctuations in the measurement results, which cannot effectively guide production. 

Using XRF-1700 sequential X-ray fluorescence spectrometer, through the production of standard films, the selection of measurement current, the selection of the best spectral line of each element, the selection of background parameters, the selection of 2theta and PHD, the establishment of working curves, and method accuracy tests In contrast to the sample test and method precision test, an analytical method for the determination of tungsten, molybdenum, and zirconium in niobium-tungsten alloys by X-ray fluorescence spectrometry was finally established. Each element of this method is measured simultaneously, with a wide detection range, good accuracy and precision, and high analysis efficiency. It can well solve the analysis of tungsten, molybdenum and zirconium content in niobium tungsten alloy, and can meet the determination of samples in actual production.