Determination of Oxygen Content in the Lanthanum Cerium Rare Earth Steel by Infrared Absorption Spectrometry with Inert Gas Fusion
High quality rare earth steel requires precise control of low oxygen content,but testing results for oxygen content determination based on existing GB/T 11261-2006 standards have significant inaccuracies.This study focused on rare earth steel with different levels of lanthanum and cerium rare earth elements,with the goal of accurately measuring its oxygen content.Based on inert gas melting infrared absorption technique,a study was conducted on the influence of analysis power,flux,and sample size on the analysis results of oxygen content in La-Ce rare earth steel.The results indicated that different analysis methods were needed for rare earth steels with different lanthanum and cerium content.When the content of lanthanum and cerium in rare earth steel was low,the oxygen content in rare earth steel can be accurately determined by reducing the analytical power.For the rare earth steel with high content of lanthanum and cerium,tin needs to be used as the flux at the same time,and the ratio of the flux to the sample should be set to 1∶1(weighing 0.3-0.6 g)to achieve accurate determination of oxygen content on the basis of regulating the analysis power(4 000～4 500 W),experiment for precision showed that the relative standard deviation(RSD)was less than 8.0％,and rates of recovery from 97.0％ to 108％ were confirmed by employing certified reference material.The reason for the slight increase in spiked recovery rate was that the fluxing agent Sn lowered the alloy melting point,allowing the oxygen in a small amount of refractory oxide to be more fully released.This method can be used for accurate determination of oxygen content in rare earth steel.
rare earth steeloxygeninert gas fusioninfrared absorption spectrometry
万方数据
维普
