蛍光X線分析法によるNi-Ti合金の高精度Ni分析

抄録

The extremely tight control of constituent elements is essential to the advanced shape memory alloys. In order to judge the molten metal acceptable or unacceptable, the standard deviation in Ni analysis should be 0.005wt% or less. The handy and prompt X-ray fluorescence spectroscopy is tailored to secure such accuracy through following procedures. 1) Sampling into an iron case to obtain the fully columnar cast structure through the cross section 2) Masking samples with the identical mask for every measurement 3) Calculation of Ni from the intensity ratio Ni/Ti, where Ti is treated as an internal standard 4) Calibration with at least 7 Ni-Ti alloys prepared in-house.