Simultaneous determination of oxygen, nitrogen and hydrogen in titanium alloys by inert gas fusion-thermal conductivity/infrared method
ZHAI Ke-xin,WANG Yong*,LIU Yuan-qing,LIU Lin
Product Quality Supervision and Testing Institute of Panzhihua, National Quality Supervision and Testing Center of Vanadium and Titanium Products, Panzhihua 617000, China
Abstract：A method for simultaneous determination of oxygen, nitrogen and hydrogen in titanium alloy was established by inert gas fusion-thermal conductivity/infrared method. The calibration curve was plotted by use of appropriate standard samples of titanium alloy. Through testing, the optimal test condictions was determined :the amount of fluxing agent nickel basket was 1 g for 0.13-0.15 g of sample and the analysis power was 0.55 kW. The linear ranges of oxygen, nitrogen and hydrogen were 0.000 1%-0.1%, 0.000 1%-0.01% and 0.000 05%-0.002% (mass fraction), and their detection limits were 0.000 045%, 0.000 061% and 0.000 018% (mass fraction),respectively. The experimental method has been applied to the determination of oxygen, nitrogen and hydrogen in practical titanium alloy, whose results were consistent with those of national standard method (GB/T4698.7-2011 and GB/T4698.15-2011), with relative standard deviation (RSD, n=6) within the range of 0.14 %-4.6 %.
