Determination of carbon in iron-silicon-boron amorphous alloy strip by high frequency induction combustion infrared absorption method
LIU Pan1, ZHANG Yi1, CHANG Guo-liang1, ZHANG Xin-yao1,2
1. Luoyang Ship Material Research Institute, Luoyang 471023, China; 2. Henan Key Laboratory of Technology and Application of Structural Materials for Ship and Marine Equipment, Luoyang 471023, China
Abstract：Carbon has an important effect on the properties of iron-silicon-boron amorphous alloy strip. The determination of carbon content in iron-silicon-boron amorphous alloy strip by the high frequency induction combustion infrared absorption method was studied. The key parameters such as sample size, sample mass and flux were optimized. The optimum experimental conditions were obtained as follows: the iron-silicon-boron amorphous alloy strip sample was cut in chips with size less than 5mm×5mm; 0.2g of sample was weighed and transferred into ceramic crucible, then multiple fluxes were added (0.2g of tin-0.4g of iron-1.7g of tungsten, or 0.2g of tin-1.7g of tungsten); the instrument was calibrated using certified reference materials of steel. The results showed that the sample size had a significant effect on the analysis results, and larger sample size would lead to lower determination values. The sample mass, as well as the type, dosage and addition sequence of flux had a slight effect on the analysis results. When 0.2g of tin-0.4g of iron-1.7g of tungsten were used as flux, the blank value of method was (22±9.7)μg/g (n=10). The limit of detection was 0.003%, and the limit of quantification was 0.010%. When 0.2g of tin-1.7g of tungsten were used as flux, the blank value of method was (4.4±6.7)μg/g (n=10). The limit of detection was 0.002%, and the limit of quantitation was 0.007%. Therefore, the limit of quantitation of method was 0.007%-0.010%. The proposed method was applied for the analysis of iron-silicon-boron amorphous alloy strip actual sample. The relative standard deviations (RSD, n=8) of determination results were less than 3.5%. The spiked recoveries were between 90% and 107%.
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