Abstract：The contents of rare earth elements in nickel-based single crystal superalloy have an important influence on its thermal properties and stability. Therefore, it is necessary to monitor and determine the rare earth elements accurately. The nickel-based single crystal superalloy sample was dissolved with 3 mL of hydrochloric acid-nitric acid mixture (the volume ratio of hydrochloric acid and nitric acid was 5∶1) and 1.5 mL of hydrogen peroxide in experiments. Sr was selected as internal standard to correct Sc. Rh was selected as internal standard to correct La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y. The standard curve was prepared by matrix matching method to overcome the matrix effect. Helium was used as collision gas, and the interference of oxides and hydroxide ions formed by light rare earth elements on heavy rare earth elements (including 153Eu, 157Gd, 136Dy and 166Er) was eliminated using the collision cell reaction mode. A method for the determination of trace rare earth elements in nickel-based single crystal superalloy by inductively coupled plasma mass spectrometry (ICP-MS) was established. Under the optimum experimental conditions, the linear correlation coefficients of the calibration curves were all above 0.999. The linear range was 4-100 ng/mL. The limit of detection was 0.013-0.027 μg/g, and the limit of quantification was 0.04-0.09 μg/g. The proposed method was applied to the determination of rare earth elements in actual sample of nickel-based single crystal superalloy. Moreover, the spiked recovery tests were conducted. The relative standard deviations (RSD, n=7) of determination results were not more than 5.6%, and the spiked recoveries were between 94% and 106%.
张馨元, 胡净宇, 侯艳霞, 刘晓波, 齐荣, 刘庆斌. 电感耦合等离子体质谱法测定镍基单晶高温合金中痕量稀土元素[J]. 冶金分析, 2022, 42(2): 1-7.
ZHANG Xinyuan, HU Jingyu, HOU Yanxia LIU Xiaobo, QI Rong, LIU Qingbin. Determination of trace rare earth elements in nickel-based single crystal superalloy by inductively coupled plasma mass spectrometry. , 2022, 42(2): 1-7.
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