高频感应燃烧红外吸收法测定铁硅铝合金中碳  

Determination of carbon in iron-silicon-aluminum alloy by high frequency induction combustion infrared absorption method

作　　者：刘攀[1,2] 李斌 龚慧[1] 陈倩倩 陈迪春 张欣耀 LIU Pan;LI Bin;GONG Hui;CHEN Qianqian;CHEN Dichun;ZHANG Xinyao(Luoyang Ship Material Research Institute,Luoyang 471023,China;Xiamen Sunrui Material Research Institute Co.,Ltd.,Xiamen 361000,China)

机构地区：[1]洛阳船舶材料研究所,河南洛阳471023 [2]厦门双瑞材料研究院有限公司,福建厦门361000

出　　处：《冶金分析》2024年第1期52-58,共7页Metallurgical Analysis

摘　　要：铁硅铝合金是由7%~9.5%的硅、5%~6.5%的铝和铁基体组成的重要磁性材料,其中碳杂质会降低其磁导率,需准确监控。针对铁硅铝合金中碳含量分析标准方法及应用研究缺失的现状,建立了高频感应燃烧红外吸收法测定铁硅铝合金中碳含量的方法,重点考察了样品量和助熔剂对测定结果的影响。确定的方法如下:准确称取0.2~0.3 g样品与1.5 g钨+0.20 g铁+0.30 g锡三元助熔剂,采用钢铁标准样品建立仪器校准曲线,其线性相关系数为0.999 1;采用校准曲线对钢铁标准样品中碳进行分析,测定值与标准值相符。方法检出限为6μg/g,定量限为21μg/g。按实验方法测定碳质量分数为0.005%~0.020%的铁硅铝合金样品,测定结果的相对标准偏差(n=6~7)均小于8%,钢铁标准样品中碳的加标回收率介于89%~110%之间。Iron-silicon-aluminum(Fe-Si-Al) alloy is an important magnetic material composed of silicon(7%-9.5%),aluminum(5%-6.5%) and iron matrix.The content of carbon impurity will reduce the magnetic conductivity of Fe-Si-Al alloy,and should be accurately monitored.At present,there are no standard analysis methods for carbon in Fe-Si-Al alloy,and the application studies are in lack.In this study,the method for the determination of carbon content in Fe-Si-Al alloy by high frequency induction combustion infrared absorption method was established.The effect of sample mass and flux on the determination results was investigated.The following conditions were obtained:0.2-0.3 g of sample was accurately weighed and then fused with ternary flux(1.5 g of tungsten+0.20 g of iron and 0.30 g of tin).The calibration curve of instrument was established using the certified reference materials of steel,and the linear correlation coefficient was 0.999 1.The content of carbon in the certified reference materials of steel was analyzed using the calibration curve,and the found results were consistent with the standard values.The limit of detection was 6 μg/g,and the limit of quantification was 21 μg/g.The Fe-Si-Al alloy with carbon of 0.005%-0.020% was determined according to the experimental method.The relative standard deviations(RSDs,n=6-7) of determination results were less than 8%,and the recoveries were between 89% and 110%.

关 键 词：高频感应燃烧 红外吸收 铁硅铝合金 碳 钨-铁-锡三元助熔剂 

分 类 号：O657.33[理学—分析化学] TG115.33[理学—化学] TF645[金属学及工艺—物理冶金]