Abstract：The existence form and composition of silicon in melted high-silicon sample after combustion in high frequency induction furnace were observed by scanning electron microscope (SEM) and energy disperse spectroscopy (EDS). The influence of silicon in sample on the melting effect was investigated from different points of view. Moreover, the influence of silicon on the determination results of carbon and sulfur by high frequency combustion infrared absorption method was also investigated. The results indicated that silicon in sample melt was mainly embedded in matrix such as tungsten oxide and iron oxide in the form of spherical silicon dioxide particles when only pure tungsten was used as flux. The presence of silicon worsened the determination accuracy of carbon and sulfur by high frequency combustion infrared absorption method. Moreover, this influence gradually increased with the increase of silicon content in sample. Based on the analysis of influence mechanism, the generated silicon dioxide worsened the flowability of melt. Moreover, the ability to form induced current by electro-magnetic induction was also weakened. As a result, the precision and accuracy of determination results were influenced. Based on the use of tungsten flux, the test was conducted by addition of pure tin or pure iron flux. The results showed that the melting point of sample could be reduced and the molten pool temperature could be enhanced by adding certain amount of pure tin or pure iron flux thus greatly improveing the melting effect. As a results, the determination precision and trueness for carbon and sulfur was improved.
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REN Wei-ping. Influence of silicon on determiantion of carbon and sulphur in high silicon sample by high frequency combustion infrared absorption method. , 2019, 39(3): 21-25.
任维萍.高频燃烧红外吸收法测定高锰不锈钢中痕量硫的助熔剂选择及其作用机理研究[J].冶金分析,2012,32(11):26-30.REN Wei-ping.Researches on selection and action mechanism of flux for the determination of trace sulfur in high manganese stainless steel by high frequency combustion-infrared absorption method[J].Metallurgical Analysis,2012,32(11):26-30.
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