Superconducting Research On The Chemical Analysis Method Of Niobium Titanium Alloy

Niobium-titanium (NbTi) superconducting materials have good superconducting properties, excellent mechanical properties and relatively low manufacturing costs, is currently the most widely used low-temperature superconducting materials. Currently NbTi superconductor is mainly used in magnetic resonance imaging (MRI), nuclear magnetic resonance (NMR), laboratory equipment, particle accelerators, electricity, mine, ore magnetic separation, magnetic levitation trains, superconducting magnetic energy storage (SMES), etc. Where annual consumption of MRI NbTi superconducting wire is about 1000t. In recent years, large-scale scientific experiments such as the LHC Europe and W7-X, Korea KSTAR, China, EAST, Japan JT60-SA and ITER international cooperation projects have been or will be consumed count the number of tons of NbTi superconducting wire. Since NbTi superconducting material mainly used in major high-tech projects, we decided it must be absolutely reliable during operation, which the NbTi superconducting alloy itself is made very high quality requirements.According to NbTi superconducting alloy chemical composition analysis, laboratory determination of impurities in the material elements (Al, Si, Fe, Cr, Cu, Ta) using conventional emission spectrometry, gas elements (C, N, H, O) Determination of precious metals are generally measured with reference to a chemical analysis, the prevalence of large fluctuations in the test results, the shortcomings of poor reproducibility, is not conducive to an objective assessment of product quality.The correlation detection technology research for NbTi superconducting alloy, not only can be measured with a NbTi superconducting alloy materials relevant performance parameters accurately, but also has great significance for promoting the development of superconducting materials testing technology to ensure the reliability of the materials used. In this thesis, analytical methods for the study of superconducting NbTi alloys, consists of five parts:First, an inert gas determination of the amount of hydrogen fusion-thermal conductivity method (0.0002?0.050%); second, determination of titanium content ammonium ferric sulfate titration(40%?60%); third, high-frequency combustion infrared absorption spectrometry determination of carbon content(0.0010?0.15%); Fourth, inductively coupled plasma emission spectrometry aluminum, nickel, silicon, iron, chromium, copper, tantalum content(Al,0.003?0.020%?Ni,0.003?0.020%?Si,0.005?0.050%?Fe,0.005?0.050%?Cr, 0.003?0.020%?Cu,0.003?0.020%, Ta); V. inert gas fusion infrared/thermal conductivity method for simultaneous determination of oxygen and nitrogen (O, 0.0010?0.30%?N, 0.0005?0.030%). The innovation of this study is that the modern instrument analysis technology as the main means to establish an accurate and rapid chemical detection methods niobium-titanium alloy with high sensitivity, to fill the gaps in the field of materials testing. In order to promote accurate and effective in detecting superconductivity provide technical support with the development of NbTi alloy materials.