Abstract：The particle size of sample was controlled at 100-160 mesh (96~147 μm), and 0.10-0.20 g of sample was fused with 1.8 g of tungsten particle, 0.30 g of pure iron and 0.15 g of tin as flux. Then, the certified reference material of titanium alloy with carbon mass fraction of 0.006%-0.069% was used to create the calibration curve.Consequently, an analysis method of carbon content in vanadium-aluminum alloy was established by high frequency combustion infrared absorption method. Under the optimized conditions, the calibration curve was plotted with the mass fraction of carbon as abscissa and its peakarea as ordinate. The linear regression equation of calibration curve was y=5.878+859.4x with correlation coefficient of r=0.999. The detection limit and lower limit of quantitation was 0.001 1% and 0.003 8%, respectively. Certain amounts of aluminum scrap and vanadium-iron certified reference materials were used to prepare synthetic vanadium-aluminum samples according to the composition of AlV55 vanadium-aluminum alloy. The synthetic samples were determined by the proposed method, and the results were basically consistent with the theoretical values. This method was applied to the determination of carbon in actual vanadium-aluminum alloy actual samples (AlV55, AlV65, AlV75 and AlV85). The relative standard deviations (RSD, n=7) were less than 10%. The recoveries of carbon in titanium alloy were between 92% and 107%. For thevanadium-aluminum alloy sample(AlV55) with carbon content of 0.040%, the expanded combined uncertainty was 0.002 6%.
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