Abstract：The experimental conditions for the determination of carbon in nickel-based superalloy by high frequency combustion infrared absorption method were discussed. The effect of flux type, addition way, dosage and sampling mass on the determination was investigated. The results showed that the sample combustion was best when 0.4 g of iron flux and 1.2 g of tungsten-tin flux were added on the bottom of sample. For 0.5 g of sample, the combustion overflow could be prevented. Meanwhile, the sample representativeness could be guaranteed. The determination range of method was 0.000 5%-0.23%, and the low limit of determination was 0.000 5%. The proposed method was applied to the determination of nickel-based superalloys and other nickel-based alloys prepared by different processes, including normal precision casting alloy, wrought superalloy and controlled directional solidification high temperature alloy. The found results were consistent with the certified values. The proposed method was also applied to the determination of carbon in standard sample and actual sample of nickel-based superalloy. The relative standard deviations (RSD, n=8) were between 0.16% and 3.3%.
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